best agm battery

The 15 Best AGM Batteries For RV Camping 2021

Without the batteries, your vehicle would not go anywhere. A solid, reliable battery bank is extra important when you’re camping in an RV, since it provides the power to run your electrical appliances and devices, so that you do not have to sacrifice comfort on the road. This is especially so for boondocking, when you do not have access to the electrical hookups in RV parks and campgrounds. Among the different types of deep cycle batteries for camping and boondocking, having the best AGM battery would be the go to choice that ensures a steady supply of power, so you can enjoy your trip to the fullest.  

You probably have heard that AGM batteries are the most advanced with the best performance and longest service life. The best AGM battery can cost you hundreds of dollars though, so you’ll want to get your money’s worth. Worry not, as our handpicked list of the very best AGM battery models on the market will save you time browsing through the vast sea of products. These are the most well-rounded, versatile and durable, as testified by in-depth AGM battery reviews by full-time and seasoned campers. 

In addition, to help you make an informed purchasing decision, this comprehensive guide will also equip you with all the crucial information about this special type of battery for RVs, including their pros and cons, the types, buying criteria, plus installation and maintenance tips.

Best AGM Batteries Comparison Chart

NoTop-Rated AGM BatteriesPricesOur Ratings
1Weize 12V100-1 - Best Overall$$*****
2UPG UB121000 - Editor's Choice$$*****
3Mighty Max ML35-12 - Best Value$*****
4XS Power D3400$$$*****
5Vmax SLR-125$$$*****
6Interstate DCM0035$***
7WindyNation BattaMax$$*****
8ACDelco 88864541$$****
9Renogy AGM12-100$$****
10Chrome Battery$*****
11Optima RedTop 8020-164$$***
12Optima YellowTop DH6$$$****
13Odyssey 65-PC1750T$$$*****
14Interstate Batteries SLA1156$***
15ACDelco ACDB24R$$***

AGM Battery Basics 

What is an AGM battery?

Firstly, AGM batteries are deep cycle batteries. They must be distinguished from the regular starter batteries or cranking batteries used in most vehicles you see on the street. 

Deep cycle batteries are not made to crank a vehicle’s engine by delivering a very large starting current for a very short time, but are designed to discharge slowly, thereby providing steady power for several hours at a time. They are made to handle many thousands of cycles of deep discharge and recharge over its lifetime. 

These make them ideal for use in recreational vehicles, boats and some other applications. Having the best AGM RV battery is crucial for full-time or frequent campers, especially the off-road campers who don’t stay over at RV parks and campgrounds for electrical hookups. 

Among the different types of deep cycle batteries, AGM batteries are the most recent and advanced invention. AGM batteries offer significant advantages over both the traditional flooded batteries and the sealed gel batteries, but only priced at the same level as the gel  type. AGM batteries are now the battery of choice for countless campers and anglers. 

A 12 volt AGM battery is a battery that incorporates a fiberglass mesh mat or separator designed to contain the electrolyte and separate the plates. Owing to the incorporation of glass mat separators, electrolytes in AGM batteries would be kept in a suspended dry state instead of free liquid form. This means that the sealed AGM batteries are spill-proof, maintenance-free and will not leak acid even if broken, unlike the flooded lead acid batteries.  

Another important advantage of this construction with the fiberglass mat or separator is that the mat provides structure and support to the plates, so that the plates can be made from purer, high density lead. This directly results in greater power to weight ratio, which is referred to as a battery’s power density.  Secondly, this design means that an AGM battery can better withstand frequent deep discharges, which translate to a longer unit life than all the other types.

How does an AMG battery work?

Despite their differences, AGM batteries and other deep cycle batteries basically have the same construction and work under the same mechanism. AGM batteries are constructed of a housing that hides one lead plate and one lead oxide plate, which are submerged in an electrolyte solution made up of 65 percent water and 35 percent sulfuric acid. 

The sulfuric acid will trigger a chemical reaction on the lead dioxide plate, the products of which are ions and lead sulphate. The ions produced by the lead dioxide plate react to the adjacent lead plate to produce hydrogen and lead sulphate.

The final result is a chemical reaction that produces electrons, which race around the plates and generate electricity. These electrical currents get channeled out of the battery terminals to start the engine and power electrical devices in your rig or boat.

During operation, AGM batteries should steadily transfer electrolytes held in the separators to the plates. The amount of electrolytes on the battery separators would still stay at an adequate level in order to provide full capacity. 

A 12-volt AGM battery consists of 6 cells, each comprises a set of plates. As each cell produces 2.2 volts, the six cells in a 12-volt battery produce a total of 13.2 volts. 

Why You Need The Best AGM Battery For Camping

Opens up traveling opportunities: The best AGM battery is ideal for boondocking without electrical hookups, when you feel adventurous and want to travel off the beaten path, away from the crowded RV campgrounds. Having the best AGM battery on board will ensure power supply wherever you go, thus opening up more camping possibilities that are not tied to conventional places with electrical services.

Output: Compared to traditional batteries, AGM batteries have rather low internal resistance so power passes through them with relative ease. As a result, AGM batteries could guarantee excellent outputs in a wide range of settings. 

Number of cycles and Efficiency: In addition to safety and convenience, the best AGM battery can tolerate a much deeper depth of discharge than flooded batteries and tolerate the most discharge cycles over its life, which means you get more use out of an AGM battery. AGM batteries also boast the highest charging efficiency among deep cycle batteries, so they reach full charge faster and hold the charge better.

Emission: Since AGM batteries nowadays happen to have a well-sealed construction, they never release toxic emissions into the surrounding. That means if you assemble your battery bank out of AGM batteries, there is no need to worry about ventilation. 

Maintenance free: The sealed construction of AGM batteries eliminates the hassle of spilling acid in use. Hence, keeping conventional AGM batteries in top shape is just a walk in the park. 

Longevity: AGM batteries are known for superior tolerance to extreme cold, which is never healthy for batteries, and are much more resistant to the vibration and shocks while you’re traveling on rough terrains. Thanks to these features, AGM batteries receive and deliver charge without trouble for years. All these advantages make them the best choice for a broader range of recreational applications. In the case that your battery bank consists of quality AGM batteries, you don’t have to think about replacing it for quite some time. 

Economical in the long run: While AGM batteries seem kind of expensive, their longevity would help you save some bucks in the long run. By heading out with AGM batteries, the money that goes into battery replacements should be reduced. 

They are expensive though: The only disadvantage of owning the best AGM battery for camping applications is that they are considerably more expensive than the traditional flooded lead acid batteries and the sealed gel batteries. This is due to their high density of lead, and their distinctive design that results in much higher manufacturing cost. That said, that initial cost premium will be justified by longer unit life in more extreme weather conditions. 

Types Of AGM Batteries 

AGM batteries for RVs could be categorized into two types: flat plate AGM batteries and spiral wound AGM batteries. 

Flat AGM Batteries: At first glance, the average flat AGM batteries resemble flooded acid batteries in a couple of regards. Normally, batteries of the type carry six sets of plates compressed in rows so as to put out more capacity. 

Spiral AGM Batteries: As the name suggests, a spiral AGM battery is a thin-plate, pure lead battery design that layers the plates in a spiral wound layout that speeds up the charging process. Thus, batteries of the type prove popular among those that wish to fully recharge the batteries as fast as possible. The best AGM battery of the spiral type typically uses 99.99 percent pure lead to allow for a greater number of deep discharge cycles over the life of the battery.  

In comparison, the typical flat plate AGM battery has 15 percent more plate surface area than its spiral counterpart. Compared to a spiral AGM battery, a flat plate design is denser, heavier and more powerful for its size.


Best Performing AGM Batteries

There seem to be hundreds of AGM batteries on the market, which can certainly be overwhelming. To give you a good head start, we have selected the very best AGM battery models below, based on their technical specifications and in-depth AGM deep cycle battery reviews by owners of recreational vehicles and boats as well as experts’ opinions.

Regardless of your camping needs and what you intended the batteries for, these well-rounded, reliable AGM batteries will ensure that you get steady supplies of power to operate all your electrical accessories, so that you won’t have to sacrifice comfort while boondocking.

1. Weize 12V100-1 AGM Battery – Best Overall

Weize 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 100Ah
  • Deep cycle AGM battery for RV camping, boondocking, and solar panels.
  • Can be wired in series
  • Heavy-duty calcium-alloy grid, sealed and maintenance free
  • Weight: 57 Lbs
  • Screw included, but no wire harness or mounting
  • 1 year warranty

Why This Is The Best:

This model is one of the best AGM battery models on Amazon, with a 4.6 star overall rating from over 1,200 customers on Amazon. With a voltage of 12V and an ampere hour of 100Ah, this battery can produce sufficient power to operate many appliances and devices at the same time, so you won’t have to worry about not being able to use the coffee maker while the air conditioner is on. This model can be wired in series to provide more powerful battery banks that can supply 24 volts, 36 volts or 48 volts of power, so if you own a large luxury Class A motorhome with many residential grade, power-hungry appliances, this will be the best AGM battery for you.

Thanks to the incorporation of state of the art, heavy-duty calcium-alloy, Weize 12V100-1 gives a reliable performance in a diversity of camping environments, making them an ideal choice for full-time campers who travel through varying weather conditions. 

In addition, with a valve regulated design, the battery of Weize works like a charm in enclosed space without leaking. Because of that, various enthusiasts of RVing who travel on rough terrains often and have concerns about spilling acid think of 12V100-1 as the best AGM battery in its price range. 

Slim and sleek, the 12-volt AGM battery made by Weize is superior to many of its contemporaries regarding handling characteristics. Thus, moving 12V100-1 around is a walk in the park and the inclusion of screws speeds up the securing process. As for longevity, if you build your battery bank with the Weize battery, years would pass before you have to look for replacements. Boasting such a heavy-duty, sealed construction, Weize 12V100-1 lasts a long time in use with beatings on the open road. That is of course, given that you use an appropriate charger for deep cycle batteries and practice the good habit of recharging your AGM batteries before it is depleted to below 50% depth of discharge.  

As proof of confidence, Weize willingly backs its battery with a one-month guarantee and a one-year manufacturer warranty. 12V100-1 also gets plenty of positive remarks from AGM deep cycle battery reviews for its post-purchase support. 

Things We Like

  • Deep discharge recovery for longer service life
  • Rugged construction: heavy-duty, calcium-alloy grid that provides exceptional performance 
  • Can be used in enclosed and indoor environments without leaking or maintenance
  • Excellent handling 
  • Can be wired in series to provide 24 volts, 36 volts or 48 volts of power

Things We Don’t Like

  • Quality control requires improvements 
  • Report of inconsistent discharge appear occasionally

2. Universal Power Group UB121000 – Editor’s Choice

Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 100Ah
  • Deep cycle AGM battery
  • Can be wired in series
  • Vibration and shock-resistant 
  • Built-in carrying strap
  • Weight: 60 lbs

Why It’s An Editor’s Choice:

Engineered to be vibration and shock-resistant, Universal Power Group UB121000 could deal with everything that people throw at it. Moreover, since it happens to be sealed, UB121000 accepts multiple orientations too which is a big plus in cramped spots. Hence, the battery made by Universal Power Group is the battery of choice for those that have little space to spare for a battery bank. Being light and compact, Universal Power Group UB121000 takes insignificant amounts of effort to position in most of the cases. 

With a capacity of 12 volts and 100 Ah, this AGM battery can meet the demand of modern-day recreational vehicles with an array of convenient appliances. As a result, there is no need to wire UB121000 in series to change the voltage rating of the battery bank. But if you have above average power consumption, this AGM battery can be wired in series to provide 24 volts, 36 volts or 48 volts of power, which is plentiful regardless of the application or how big your party is. In addition, its 100Ah rating allows the Universal Power Group UB121000 to power appliances for quite some time. With the AGM battery from Universal Power Group, maximizing the level of comfort in the outdoors is child’s play. 

Don’t want to wait forever for your battery bank to get to full charge? Then the battery from Universal Power Group is going to be your best AGM battery. Thanks to the low internal resistance, Universal Power Group’s UB121000 needs much less time to recharge than its competitors.  

Things We Like

  • Light and compact, fit in the battery bank of most RVs, simple to set up
  • High endurance even on rough terrains: vibration and shock-resistant
  • Maintenance free and leak free 

Things We Don’t Like

  • Several people complain about shorted cells 
  • Some complains that it loses its capacity to hold a charge over time
  • Some claims that it is not suited for solar applications

3. Mighty Max ML35-12 – Best Value For Money

Mighty Max Battery ML35-12 - 12V 35AH U1 Deep Cycle AGM Solar Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 35Ah
  • Shocks and vibration resistant 
  • Wide operating temperatures
  • High discharge rate 
  • Deep discharge recovery
  • Can be mounted in any position
  • Weight: 23.2 lbs
  • No wire harness or mounting accessories included.

Why It’s The Best Value:

Versatile and adaptable, ML35-12 of Mighty Max allows people to power all kinds of appliances around the clock without interruptions. Boasting wide operating temperatures, the AGM battery from Mighty Max can perform reliably in varying and extreme weather conditions, making it a solid investment for full-time campers who travel year round or those who love to explore the icy landscape in the winter. This versatility allows for more traveling possibilities. In addition, Mighty Max ML35-12 uses integrated cells to allow for resistance to vibrations and physical impacts on rough terrains, which further adds to its extended lifespan. 

With a high discharge rate, ML35-12 keeps the output consistent and reduces the time it requires to charge the cells. Additionally, since this Mighty Max battery features deep discharge recovery, it could return to full capacity even when nearly depleted without the risk of dying prematurely. Naturally, those that worry about possible losses of charging capacity over time hold Mighty Max ML35-12 in high esteem. That said, do not abuse your precious AGM batteries if you want to enjoy an optimal service life. 

Another plus is ML35-12 is available at a reasonable price as well so squeezing it into the spending plan is a cinch. About installation, this AGM battery is one of the most lightweight models, weighing only 23.2 lbs with quite a compact footprint. This portability of Mighty Max ML35-12 means users only need mere minutes to position and secure it in any position. 

Things We Like

  • Inexpensive 
  • Space-saving and lightweight, second to none portability
  • Wide operating temperatures 
  • Deep discharge recovery for optimal lifespan
  • Short charging time

Things We Don’t Like

  • Certain batteries arrive with bent terminals 
  • Packaging leaves something to be desired 

4. XS Power D3400

XS Power D3400 XS Series 12V 3,300 Amp AGM High Output Battery with M6 Terminal Bolt
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 65Ah
  • Sealed
  • Valve regulated
  • Low internal resistance

Why We Love It:

Wish to build your battery bank using no-nonsense AGM batteries that could hold together? If that is the case, there is a very good chance that you would come to like XS Power D3400. Created with low internal resistance, this battery facilitates the flow of electricity which simultaneously helps maintain output and accelerate recharge. Furthermore, as it’s sealed, D3400 is essentially spillproof so you should be able to mount it in virtually any orientation that you see fit. 

Compared to most of its contemporaries, the battery of XS Power is light so moving it from spot to spot is a piece of cake. Besides that, D3400 possesses a highly compact construction that occupies negligible amounts of space too. As a result, you don’t have to turn your place upside down in order to accommodate a battery bank made of XS Power D3400. Upon purchase, the XS Power battery is accompanied by screws that eliminate the need to buy hardware to secure it. 

Though D3400 of XS Power costs a bit more than other batteries, the values it provides match its price tag. So as to reassure potential customers, XS Power backs its AGM battery with a three-year warranty that gives people much-needed peace of mind. 

Things We Like

  • Rugged
  • Quick shipping 
  • Setup process is instantaneous 

Things We Don’t Like

  • People report receiving damaged batteries 
  • Swelling cells is irregularly noted  

5. Vmax SLR-125

Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 125Ah
  • Strap
  • No emission 
  • Military-grade plates

Why We Love It:

Employing military-grade plates for extending longevity, Vmax SLR-125 would remain usable up to a decade without requiring sophisticated maintenance. Needless to say, for people that don’t have many chances to pick up battery replacement, SLR-125 is the best AGM battery available for purchase. In addition to that, since the AGM battery from Vmax packs a convenient carrying strap, there is no need to touch its exterior during relocation. That is a big plus in the case there is acid spilling out of cells. 

Featuring an ampere hour of 125Ah, this battery would have no trouble powering various appliances for long periods. Also, with a rating of 12V, SLR-125 could pair with an assortment of setups at short notice and that is advantageous. In terms of recharge, SLR-125 of Vmax rarely takes a lot of time to go from near depletion to max capacity. Unsurprisingly, the Vmax battery earns high scores from a wide range of AGM RV battery reviews for its recharge speed. 

About post-purchase support, Vmax offers everyone that decides to grab its battery a tip-top one-year manufacturer warranty. If your SLR-125 fails due to defects within the warranty period, you can claim yourself a replacement free of charge. 

Things We Like

  • Tough 
  • Intuitive installation 
  • Lifespan is fantastic 

Things We Don’t Like

  • A couple of users notice losses in charge capacity 
  • Cells of batteries overheat from time to time

6. Interstate DCM0035

Interstate Batteries 12V 35AH Sealed Lead Acid (SLA) AGM Deep Cycle Battery (DCM0035) Insert Terminals
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 35Ah
  • Recyclable 
  • Removable handle
  • Multiple mounting orientations 

Why We Love It:

Capable of delivering power in challenging conditions, Interstate DCM0035 could be put to good use in applications that require consistency. Utilizing the latest valve regulated technology, the battery made by Interstate is protected from overpressure, spilling acid and so on. Moreover, DCM0035 boasts a wonderful float life so it would serve people well for years before it must be replaced. Because of that, DCM0035 of Interstate is considered to be among the leading AGM batteries for sale of its type on the market regarding longevity. 

Since DCM0035 happens to incorporate a removable handle, its relocation only involves a bit of time as well as stamina. Besides that, thanks to the sealed body, the battery from Interstate accepts multiple mounting orientations with no risk of spilling. Hence, DCM0035 of Interstate is able to adapt to a diversity of appliance arrangements in a blink of an eye. Last but not least, DCM0035 is a breeze to maintain so when installation completes, it needs little attention from users.

One interesting thing about this AGM battery is that it’s designed to be recyclable. Naturally, while talking about the best AGM RV battery, numerous eco-conscious owners of recreational vehicles bring up Interstate DCM0035. For affordability, DCM0035 is budget-friendly so its purchase should have inconsequential impacts on spendings. 

Things We Like

  • Lightweight
  • Compact 
  • Rapid recharge 

Things We Don’t Like

  • People sometimes complain about packaging 
  • Customer service is unresponsive 

7. WindyNation BattaMax

WindyNation 100 amp-Hour 100AH 12V 12 Volt AGM Deep Cycle Sealed Lead Acid Battery - Solar RV UPS Off-Grid
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 100Ah
  • Non-spillable 
  • Pure lead
  • Heavy-duty plates 

Why We Love It:

Despite its plain appearance, WindyNation BattaMax is a robust AGM battery that could sustain plenty of appliances with relative ease. Deliberately fashioned from the ground up with heavy-duty plates, this battery remains practically uncompromised after repetitive discharges and recharges. Additionally, by integrating pure lead, BattaMax would have an easy time holding power for a long time outside of use. That is why WindyNation BattaMax still can swiftly run power to all kinds of appliances following prolonged periods of inactivity. 

The battery made by WindyNation features standard AGM battery ratings: a voltage of 12V and an ampere hour of 100Ah. Thus, people don’t have to worry much about the compatibility of BattaMax as they pair it with ordinary applications. About maintenance, BattaMax of WindyNation is non-spillable and that removes the hassle of dealing with messes of spilled acid. With spilling acid no longer a concern, users of the WindyNation battery have options once it comes to mounting orientations. 

Since its installation is a walk in the park, WindyNation BattaMax could be set up in a matter of moments. That means it seldom takes long to assemble a battery bank with the WindyNation battery. On arrival, BattaMax is also backed with a one-year manufacturer warranty that covers defects. 

Things We Like

  • Portable
  • Long-lasting 
  • Handling is superb 

Things We Don’t Like

  • People detect sporadic fluctuations in lifespan 

8. ACDelco 88864541

ACDelco 48AGM Professional AGM Automotive BCI Group 48 Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 70Ah
  • Puncture-resistant 
  • Calcium stamped alloy
  • High density negative paste

Why We Love It:

Purposely designed for today’s applications and built to last, ACDelco 88864541 is prized by those that want to build a modern, high-endurance battery bank. With a puncture-resistant envelope separator that improves acid circulation, the ACDelco battery is good at stabilizing the output while minimizing the odds of overheat. Furthermore, possessing calcium stamped alloy in its construction, 88864541 is known for having low internal resistance. Hence, 88864541 of ACDelco takes less time to recharge than other batteries on the market which prove handy in numberless situations. 

Though its ratings seem unexceptional, this battery could nonetheless power conventional appliances with its 12V voltage and 70Ah ampere hour. Owing to the presence of collapsible handles, 88864541 is quite portable too so its transportation is going to be a cakewalk. It’s worth pointing out that the battery from ACDelco contains a vent cap engineered to address leakage of acid. As a result, if you don’t like seeing puddles of acids around your battery bank, you should think about adding ACDelco 88864541 to your shortlist. 

Regarding cost, ACDelco 88864541 is not exactly a cheap AGM battery but it’s by no mean a bank-breaking purchase. The battery made by ACDelco is backed with a terrific three-year manufacturer warranty so its users have something to count on if problems occur. 

Things We Like

  • Steady
  • Wonderful lifespan 
  • Charged upon purchase

Things We Don’t Like

  • A few batteries fail to hold charge 
  • Shipping is mediocre 

9. Renogy AGM12-100

Renogy Deep Cycle AGM Battery 12 Volt 100Ah for RV, Solar Marine and Off-grid Applications
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 100Ah
  • High discharge
  • Treated plate grids
  • Proprietary quinary alloy plates

Why We Love It:

As an all-inclusive model, AGM12-100 of Renogy is loaded with nearly everything that people require in an AGM battery. Being valve regulated, AGM12-100 saves people from the trouble of cleaning up spilling acid as well as draw-out maintenance. In addition, with a combination of treated plate grids and proprietary quinary alloy plates, the AGM battery made by Renogy continuously delivers high discharge currents. Because of that, Renogy AGM12-100 is hailed to be the best AGM deep cycle battery in terms of output consistency. 

By utilizing materials with fantastic purity, the battery from Renogy manages to keep the self-discharge rate low over time. Thus, AGM12-100 could sit idly for months and still hold enough charge to operate many appliances when the need arises. Aside from that, boasting sublime thermal tolerance, AGM12-100 of Renogy is more resilient to deviations in temperature of the surrounding. Naturally, the Renogy battery is well-received by those that rely on battery banks to run appliances in demanding settings. 

Depending on the users, Renogy AGM12-100 could be mounted either upright or on its side. However, Renogy strongly recommends against mounting its battery upside down. Beyond that, people could put this battery to use in whatever way that they like. 

Things We Like

  • Low profile
  • First-class ruggedness 
  • User-friendly setup process 

Things We Don’t Like

  • People notice cells swelling on occasions 
  • A number of batteries overheat in the course of operation 

10. Chrome Battery AGM Battery 

Deep Cycle SLA Replacement Battery 12V 35AH AGM Battery- Replaces Husqvarna YTH2448 Lawn Tractor Battery- Chrome Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 35Ah
  • T3 terminals 
  • Universal application 
  • Low-maintenance 

Why We Love It:

Effective and efficient, Chrome Battery AGM Battery never fails to please its owners in use which makes it a great model for most power needs. Assembled with emphasis on universal application, this battery is capable of running various things from alarm systems to mobile scooters. Moreover, packing T3 terminals, Chrome Battery AGM Battery pair well with lots of wiring harnesses. As a result, people don’t have to be expert electricians to set up the AGM battery from Chrome Battery. 

Interestingly, Chrome Battery AGM Battery is delivered fully charged so there is no need to recharge its cells before use. Being equipped with ergonomic built-in carrying handles, the battery made by Chrome Battery outmatches traditional batteries regarding handling too. Hence, moving Chrome Battery AGM Battery between locations without gloves is just child’s play. Last but not least, as the battery of Chrome Battery takes up little space, it’s among the best choices for arrangements with size constrictions. 

Introduced to the market at a price that people could accept, the Chrome Battery battery suits an assortment of budgets. Chrome Battery AGM Battery is backed with a one-month money-back guarantee and an eighteen-month warranty that speak volumes about its terrific performance.  

Things We Like

  • Enduring 
  • Top-notch stability 
  • Installation is a snap 

Things We Don’t Like

  • Users complain about getting batteries in poor packaging 
  • Terminal needs to be strengthened 

11. Optima RedTop (8020-164)

Optima Batteries 8020-164 35 RedTop Starting Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 50Ah
  • SpiralCell 
  • Polypropylene case
  • High reserve capacity 

Why We Love It:

Integrating the unique SpiralCell, Optima RedTop (8020-164) would run clean power to plenty of appliances on a daily basis for years. With high reserve capacity, cells of RedTop (8020-164) continuously give people electricity when they need it and where they need it. Additionally, since the battery from Optima features fast recharge, its charge can be bought to max capacity in a flash. For people that cannot sit around for long to recharge the battery bank, RedTop (8020-164) of Optima is a good buy.

Created with a polypropylene case, the battery of Optima is light so position and securing it should take mere minutes. In spite of its lightweight case, RedTop (8020-164) still takes on the vibration in the course of operation without giving out. Aside from that, being completely spillproof, Optima RedTop (8020-164) even permits users an outstanding level of freedom in the mounting orientation. Needless to say, this battery is highly sought after by people who wish to stay flexible as they attempt to build their AGM battery bank.

Optima RedTop (8020-164) indeed costs more than typical  AGM battery prices but its longevity helps save money in the long run. The maintenance of RedTop (8020-164) is a cinch as well so the cells require basic care from the users in order to stay in good condition. 

Things We Like

  • Decent power output 
  • Easy to set up 
  • Float life is excellent 

Things We Don’t Like

  • Kind of pricey 
  • Barely accept customer service 

12. Optima YellowTop (DH6)

Optima Batteries DH6 YellowTop Dual Purpose Sealed AGM Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 72Ah
  • Deep cycle 
  • No spilling 
  • Cast connections 

Why We Love It:

Desire a AGM battery that could maintain its power output when things start heading south? Then it’s suggested that you spare some of your time to take a look at YellowTop (DH6) of Optima. Similar to many other batteries of Optima, YellowTop (DH6) uses SpiralCell that lets it last three times as long as its competitors on the market. Furthermore, with wonderful resistance against physical impacts, the AGM battery from Optima should endure bumps and shocks without breaking apart. 

Since it’s sealed, the Optima battery is invulnerable to elements in the outdoors which leads to no-nonsense maintenance. Aside from that, the sealed construction of YellowTop (DH6) minimizes the odds of acid spilling outs of the cells too. Because of that, Optima YellowTop (DH6) is loved by people that happen to be anxious about the corrosive acid puddles. Finally, designed with a foldable carrying handle, the battery of Optima allows users to move it into position without having to touch the case exterior. 

As for compatibility, this battery contains SAE terminals that accept a diversity of wiring harnesses. That means people don’t have to spend money on hardware to use YellowTop (DH6). YellowTop (DH6) of Optima is space-saving, hence, it smoothly squeezes into most tight corners. 

Things We Like

  • Reasonable price 
  • Quick installation 
  • Splendid compatibility 

Things We Don’t Like

  • Quality control should be overhauled 
  • Some batteries appear used on arrival 

13. Odyssey 65-PC1750T

ODYSSEY 65-PC1750T Automotive and LTV Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 74Ah
  • Pure lead 
  • Self-regulating relief valve
  • Corrosion-resistant brass terminals

Why We Love It:

Whether it’s for everyday applications of emergency uses, Odyssey 65-PC1750T would make sure that the money people drop on it is well-spent. Integrating pure lead in its plates, this battery could receive and deliver a lot of power in the course of operation. In addition to that, with robust internal cell connections, 65-PC1750T should remain stable even in arrangements with constant vibration. That is why a wide range of RVers from novices to veterans think highly of 65-PC1750T of Odyssey. 

Like other AGM batteries, the battery from Odyssey is sealed so there is no need to worry about gas emission. Also, as 65-PC1750T keeps the cell contents within its flame-retardant case, people can flexibly mount it in various orientations and that is convenient. In terms of connections, Odyssey 65-PC1750T is assembled with corrosion-resistant brass terminals that feature first-class harness compatibility. Therefore, it’s possible to add the Odyssey battery to existing battery banks without having to pick up new harnesses. 

Thanks to its carrying handle, 65-PC1750T of Odyssey only takes several moments to move from one place to another. With the space-saving body of the AGM battery made by Odyssey, finding fitting spots for it is a walk in the park as well. 

Things We Like

  • Impressive longevity 
  • Intuitive setup process 
  • Thermal tolerance is admirable 

Things We Don’t Like

  • Hardly adequate post-purchase support 
  • A few users report random failures to hold charges

14. Interstate Batteries SLA1156

Interstate Batteries 12V 35AH SLA battery, Insert Terminal (SLA1156)
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 35Ah
  • Spillproof
  • Maintenance-free
  • Ready-to-use

Why We Love It:

Charged prior to delivery, Interstate Batteries SLA1156 arrives in a ready-to-use state so people could use it the moment it leaves the packaging. With carrying straps on top, SLA1156 eliminates the need to tough the exterior of the case during the setup process. As a result, the battery made by Interstate Batteries is able to reduce risks of injuries due to acid. Moreover, since Interstate Batteries SLA1156 is spillproof, users don’t have to bother cleaning up puddles of acid from time to time which is nice. 

The ampere hour of the Interstate Batteries battery is 35Ah, thus, it’s a solid model for the average applications. At 12V, the voltage rating of SLA1156 is compatible with an assortment of appliances nowadays from the get-go too. Hence, a battery bank that makes use of Interstate Batteries SLA1156 should have no trouble powering setups around the clock. Owing to its slim and seek design, this battery from Interstate Batteries occupies just a bit of space so it would swiftly fit in anywhere. 

With thick lead plates, SLA1156 of Interstate Batteries would survive multiple discharge and recharge cycles. Consequently, once it comes to float life, not a lot of AGM batteries on today’s market could match SLA1156. 

Things We Like

  • Affordable 
  • Commendable reliability 
  • No-nonsense maintenance 

Things We Don’t Like

  • Dimensions deviate slightly between the batteries 
  • Shipping still needs to be tweaked

15. ACDelco ACDB24R

ACDelco ACDB24R Advantage AGM Automotive BCI Group 51 Battery
Check prices and reviews

Specifications And Features:

  • Voltage: 12V
  • Ampere hour: 45Ah
  • Calcium alloy
  • Corrosion-resistant grid
  • Low self-discharge 

Why We Love It:

Put together with impact resistance in mind, ACDelco ACDB24R is capable of dealing with vibration for years without compromising. Additionally, since the battery of ACDelco utilizes a corrosion-resistant grid, rust is no problem in most of the cases. Because of that, compared to other batteries, ACDB24R lasts a long time in use while requiring very simple maintenance. Naturally, those that want to spend more time enjoying themselves and less time taking care of the battery bank rate ACDB24R of ACDelco highly. 

ACDB24R contains regular terminals so hooking it up with wiring harnesses for batteries should be a piece of cake. As for the mounting orientation, the AGM battery made by ACDelco needs to be mounted upright to achieve optimal operation. Outside of use, ACDelco ACDB24R self-disrage at a slow rate but to avoid losing charge capacity, people must recharge it every two months. Finally, ACDB24R is capable of working at 0 degree Celsius but when the temperature drops any lower than that, electrolyte of its cells may freeze. 

On arrival, ACDB24R of ACDelco is charged so it could be used as soon as it’s set up. This battery is backed by a reassuring two-year warranty so if manufacturing defects cause troubles, ACDelco is going to get things right without delay. 

Things We Like

  • Dependable 
  • Easy installation
  • Well-written owner’s manual

Things We Don’t Like

  • Float life often fluctuate 
  • Users come across size issues

How To Get The Best AGM Battery

As you will see further below, the best AGM battery for your camping circumstances depends on a lot of factors that need your careful consideration, such as your estimated average daily energy consumption. Furthermore, batteries come with a few technical specifications that you must understand. All in all, to get the best AGM battery for your set budget, pay attention to the most crucial criteria below:

Voltage Rating 

There are 6-volt and 12-volt AGM batteries, each with different pros and cons. Usually, for off grid stays or travel remote areas without available power outlets, RVers would rely on a 12 volt AGM battery to power their electric appliances and devices. Compared to the 6-volt type, a 12 volt AGM battery can be found more easily and can be had for cheaper, but is not as reliable for boondocking, since the 12-volt type has limited amp-hours and energy storage. 

This is where the 6 volt AGM battery version shines. Instead of a single 12 volt AGM battery, two 6 volt AGM batteries can deliver the same amount of power with some extra benefits if wired in a special way. Wiring two 6-volt batteries to create a single power source has steadily become a preferred choice for campers who travel on long trips at a time, especially boondockers, thanks to its larger capacities. 

Compared to one single 12 volt AGM battery, each cell of a 6 volt RV battery has a larger amp capacity and a broader space per cell for power storage. These features mean that a 6-volt battery is more reliable at supplying steady and constant power and it can withstand deeper discharges over its life before wearing out. 6-volt AGM batteries typically also have thicker plates, which further maximize its service life with extensive use down the road. 

To supply 12 volts of power, you can wire two 6-volt AGM batteries in series (do check the product’s specification and the reviews to make sure this is possible). To change the voltage of the battery banks by connecting two 6 volt batteries in a series, attach one’s positive terminal with the other’s negative terminal, then use an additional set of cables to connect the open negative terminal to your RV. 

Each battery is capable of providing 6 volts of power, but in this setup, the two combined will supply 12 volts of power in total. The total Ah capacity of the battery bank stays the same as that of a single 6 volt battery though. Do note that this setup is more expensive and bulkier than a single 12 volt battery, so double check whether this would require you to install different battery boxes.

Ampere Hour (Ah) and Reserve Capacity (RC) Ratings

One of the most important ratings of RV AGM batteries is capacity or power, that is the amount of current a battery can supply over a determined time frame. How much power the battery discharges is rated or measured in Ah, which stands for amperage hours or amp-hours. Amp hours rating indicates how many amps the battery can supply in a 20-hour period.

To deduce the ideal ampere hour rating of your battery, it’s widely advised that you take the power consumption of your appliances into account. In the case that your appliances only require little electricity to operate, feel free to settle for standard AGM batteries. On the other hand, if you own plenty of power-hungry appliances, you have to stick to high Ah models. 

Another way to increase the total Ah capacity of your battery bank is to wire two 6-volt AGM batteries in parallel by connecting the positive terminals to positive and the negative terminals to negative. Now their combined Ah capacity will be the total sum of the connected batteries, while the total voltage will stay at six volts. 

A related rating to Ah capacity is reserve capacity (RC), which technically means the battery’s charge capacity and measures the amount of energy the battery effectively stores. The reserve capacity is rated in minutes and measures how long a battery can run at 25 amps of current without its voltage dropping below 10.5 volts. 

All in all, the best AGM battery for camping and boondocking should offer more amp hours and reserve capacity. The higher the rating, the longer the batteries can power your electrical appliances. It’s recommended that you estimate your daily power consumption by adding up the amps that your most frequently used appliances and devices would draw at any given time. 

Keep in mind that you won’t be using everything at the same time, so take that into account. Start with the most power-hungry items, that is the air conditioning unit, the fridge, the oven, the microwave and vacuum cleaner. Do allow for a little wiggle room so that you won’t likely go overboard.

Operating Temperature Range 

Like your car’s batteries, extreme temperatures are not healthy for the batteries in your rig. The operating temperature range of a battery is often overlooked, but this is particularly important for campers to live or travel in extreme temperatures, and frequent or full-time campers who travel year round through varying seasons. 

You should look for the best AGM battery that can provide constant power in both extreme heat and extreme cold. The best AGM battery for four-season camping should be able to withstand above 35 degrees Celsius in the summer and several degrees below freezing temperatures in the winter.

Although you can easily find out this information in the product descriptions, since manufacturers would often advertise this feature, it’s a good idea to browse the reviews to judge a product’s true weather-resistance. 

Depth of Discharge 

Another important thing to check when buying the best AGM battery is its discharge depth, expressed as a percentage of the total capacity of the battery. Most AGM batteries are made to withstand a 50% depth of discharge. Although many models might be advertised to handle up to 80% discharge, the agreed upon rule of thumb is to avoid depleting your battery down to less than 50% on a regular basis, as excessive deep discharging will shorten any battery’s lifespan.

Size 

The dimensions of the batteries that you use dictate the space that your battery bank would occupy so you should consider giving that some thought. Generally, the larger an AGM battery, the more power it tends to offer, which means your appliances will stay powered for longer.

Brands usually include details about dimensions in the owner’s manual but to be thorough, it’s best to read a couple of customer reviews. To avoid ending up with ill-suited models, use the measurements of the spot where you intend to set up the battery bank as guidelines. That is going to help you keep the number of batteries on your shortlist low and save lots of time. 

And note that if you’re thinking of wiring two 6-volt AGM batteries, note that they are generally larger in size than a single 12-volt battery, despite being significantly lighter. So they might not fit in every RV’s battery box.

Price

From $50 to $150: Though cheap AGM battery models in the range don’t have anything special to offer, they remain sufficient for typical applications. In addition to that, batteries with price tags between $50 and $150 have outstanding versatility so they adapt well to variable environments. 

From $150 to $300: Dependable and reliable, batteries in the range could meet nearly all power demands of people without costing them an arm and a leg. All you need is a no-nonsense AGM battery bank? In that case, you should keep an eye out for models that cost between $150 and $300. 

Above $300: At the other end of the scale of AGM battery prices, batteries in the range rarely let their owners down in use, thanks to the use of the best technologies and materials available. AGM batteries that cost north of $300 usually boast superior lifespan, reliability and durability despite a lot of beatings on rough terrains. 


Top AGM Battery Brands

Batteries on the market come from an assortment of brands but if you value reputability, keep these names in mind 

Universal Power Group (UPG)

Started as a distributor of electronic components to large original equipment manufacturers in 1968, UPG became an authorized Panasonic battery modification center in the ‘70s, marking the brand’s entry into the field of energy solutions. The company then started producing sealed lead-acid batteries and has further expanded its product portfolio to include more advanced products, including AGM batteries, gel batteries, smart lithium-ion batteries, solar panels and deep cycle battery chargers. Its AGM batteries for camping offer excellent value for money both in terms of performance and service life. 

Mighty Max

Established in 2006, Mighty Max Battery is the new kid around the block, but has quickly become a trusted household name when it comes to affordable, reliable and long lasting AGM batteries. Mighty Max produces a large portfolio of deep cycle batteries for a wide range of applications, including use in RVs. What’s more is Mighty Max offers products across different price points, so there is something for every wallet. The brand also manufactures all general batteries, solar panels and solar panel accessories, which would team up nicely with your AGM batteries for extended off-grid stays.​ 

VMAXTANKS

VMAX is another name you would likely see in any reviews of the best batteries for RVs. VMAX produces a variety of batteries for use in boats, RVs and many other applications, as well as battery chargers. Their batteries are known for their unmatched ability to deliver a steady supply of high currents and withstand extreme deep discharge cycles repeatedly without dying prematurely. 

Optima

Thanks to the emphasis on convenience, Optima and its batteries earn compliments from those who care about ease of use. Additionally, Optima models even come in multiple voltages so they suit a diversity of arrangements. 

Renogy

Renogy is a well known manufacturer of deep cycle batteries, as well as battery chargers, solar panels and off-grid kits for use in the homes, boats and RVs, and virtually any application you can think of. Renogy prides itself on supplying the most efficient and reliable but also most affordable AGM batteries for RV. 

Crown

Crown’s selling points for its deep cycle batteries is that the brand employs some of the thickest lead plates in the industry, which contribute to excellent power output and a longer lifespan. In addition, its products come with many well-appointed features that clearly show Crown’s attention to detail and commitment to high quality, well-rounded energy solutions for camping. For instance, while lead-acid batteries require adding distilled water regularly, Crown has made this easy by allowing you to check the electrolyte levels without having to open the battery up.

Trojan

Founded in 1925, Trojan has become a pioneer in the field of deep cycle batteries, thanks to tireless research and commitment to a high quality standard. Trojan’s AGM volt batteries for RVs are known for their capacity for supplying constant power and a long service life. 

Odyssey

Odyssey is another household name that has been around for over 100 years. Odyssey has been making reliable batteries for automobiles as well as for RVs, boats, and other recreational applications. 

NPP

NP Power International Inc. specializes in high-quality batteries for RVs. Its product portfolio offers a wide range of deep-cycle batteries, including AGM batteries, flooded lead acid batteries, gel batteries, and solar-powered batteries.


FAQs About AGM Batteries 

1. Do AGM batteries last longer than regular batteries?

On average, a flooded lead acid lasts three to five years, while gel batteries can last from 2 to 5 years. Meanwhile, AGM batteries can last anywhere between 6 and 10 years, even more with proper charging and care. 

Also, in general, you can expect the best 6 volt AGM batteries to last longer than a 12 volt AGM battery. And remember that as with everything else, proper charging and maintenance are key. Many negligent campers have had their AGM batteries dying in as little as 2 years, despite the fact that AGM batteries are known for their superior lifespan.

AGM deep cycle batteries have thicker active plates, and the alloys used to create these plates have more antimony. The benefit to having thicker plates with such a composition makes them more resistant to a common phenomenon called “positive grid corrosion”, which is typically caused by extensive charge and discharge cycles. Positive grid corrosion is actually one of the three most common reasons for battery failure. 

In other words, the thickness of the plates is directly related to the battery life. With all things being equal, the thicker the plates are, the longer the battery will last.

2. Are AGM batteries better in cold weather?

Yes, AGM batteries have the highest tolerance in extreme cold weather among all types of deep cycle batteries. AGM batteries have higher Cold Cranking Amps (CCA) for more reliable performance in cold temperatures. CCA rating measures a battery’s ability to deliver a sustained amp output at a specified temperature. 

The electrolyte in a fully charged AGM battery will only freeze around -80F (-62C). That said, you should still check your AGM batteries from time to time and maintain them during the winter months and while in storage.

3. Advantages & disadvantages of AGM batteries? Is an AGM battery worth the extra money?

An RV AGM battery incorporates a glass mat separator designed to hold electrolytes in a suspended dry state instead of free liquid form. This means that the sealed AGM batteries are spill-proof, maintenance-free and will not leak acid even if broken, unlike the flooded lead acid batteries.  

In addition to safety and convenience, the best AGM battery can tolerate more discharge cycles and a much deeper depth of discharge than flooded batteries, which mean a longer service life. They also boast the highest charging efficiency among deep cycle batteries, so they reach full charge faster and hold the charge better. They can also better tolerate extreme cold, which is never healthy for batteries, and are much more resistant to vibrations when traveling on rough terrains. All these advantages make them the top choice for the full-time campers and for a greater number of camping applications.

AGM batteries offer superior and well rounded performance, and there’s almost nothing to complain about, but only their price. RV batteries are not a small investment, especially when you get the best AGM battery, which are more expensive than the flooded and gel types. However, full-time and frequent RVers, especially those to camp off the beaten path, have testified that the price of the best AGM battery is a worthwhile investment that offers you stress-free camping for years down the open road.

4. Can I trickle charge an AGM battery?

During storage, it’s natural for all batteries to self-discharge. This is an inevitable phenomenon in which internal chemical reactions reduce the stored charge of the battery without any connection between the electrodes or any external circuit. 

To make sure your battery is topped off during extended storage in the off-season, you should get a good quality trickle charger, also called battery maintainer, to maintain the battery’s full state of charge. A trickle charger will charge the battery at a rate equal to the battery’s natural self-discharge rate.

5. Can I charge an AGM battery using a regular charger?

Technically you can, but remember that using a regular battery charger to charge your AGM battery is not at all recommended, since your deep cycle battery would not reach a full charge. However if you must, the process is as follow:

  • Safety first: put on goggles and protective gloves.
  • Disconnect the battery from your RV’s system and place it in a well-ventilated space, so that the gas released by the battery can dissipate outdoors.
  • Remove the covers of the cells using a screwdriver to check the electrolyte level. Ddd distilled water if the electrolyte level is low. 
  • Make sure the terminals are clean so that you get a good clean charge without interference. Before attaching the clamps, clean away any sulfuric acid residue from the terminals using a special cleaner for batteries and a small detailing brush or old toothbrush. Then, spray the clean terminals with an anti-corrosion spray for protection. Wait for it to dry off completely before proceeding.
  • Using a voltmeter, check the current voltage the battery stores. How much charge a battery is holding will dictate how long you should be charging, so that you can set a timer. You won’t need to do this if your charger is not a smart charger with an auto-stop function that will only trickle charge when the battery is full for fastest charging. Calculate charging time and set a timer. Your battery charger’s manufacturer should provide online charts for estimated charging time.
  • Set the charger to match the type of your battery, that is AGM. Next, connect the red clamp of the chargers to the positive terminal (+ symbol) of the battery, then clip the black clamp to the negative terminal (- symbol).
  • Connect the charge to the power outlet, then turn on the charger. 
  • The charger will notify you when the battery is fully charged. Remove the cables and reinstall the battery. But note that even then, a deep cycle battery will not reach a full charge when you use a regular charger.

6. What is the maximum charging voltage for a 12 volt AGM battery?

Always read the manual carefully to properly charge your battery at the right voltage. Either charging at a voltage lower than what is required—undercharging, or charging at a voltage too high—overcharging, will result in inefficiency and can shorten the battery’s lifespan if this happens repeatedly. 

If you overcharge at a high voltage, the battery will overheat, leading to a shorter lifespan. In addition, excessive current will flow into the battery even after it has reached full charge, causing decomposition of water in the electrolytes, which means premature deterioration. 

Also remember that each of the three or four charging stages of an AGM deep cycle battery requires a different voltage, which you must set during the initial programming phase of the charger. AGM batteries should be charged using a deep cycle battery charger with current limited to 20% or 0.2C of the batteries capacity at a charging voltage of between 13.6 – 13.8 volts for standby use or 14.6 – 14.8 volts for deep cycle use.

7. Can I jumpstart an AGM battery?

While jump starting an AGM battery would give it a small short charge and can leave the engine running for a time with a jump, keep in mind that it’s only a temporary solution when you’re in a pinch, and overtime has negative impacts on the health and lifespan of your AGM batteries. Invest in a proper deep cycle battery charger made for recharging AGM batteries so that you won’t have to replace your expensive AGM batteries too soon. 

8. How to charge an AGM battery fast?

In general, an AGM deep cycle battery should be charged at a charge rate of typically 6-amps, 10-amps or 15 amps. But if you need to charge an AGM battery quicker, you can increase the amperage up to 20 amps from 10-15 amps that it starts at.

However, be aware that this is not recommended, and doing so too often will quickly shorten the useful life of your AGM battery. For the fastest charging time, which directly translates to the most efficient charging process, what you need is a good deep cycle battery charger that charges the battery in three to four stages and has improved circuitry. These two features will control current in an optimal way for a shorter charging time without deteriorating the battery in the long run.

When you’re in a hurry and need to reduce charging time, another safer way is to only charge the battery up to 90%. This is because getting from 90% to a 100% full charge takes considerably longer than getting from 70% to 80% or from 80% to 90%, which is the same case for charging your phone and other devices. However, do note that charging to only 90% too often will shorten your battery life, as a battery’s lifespan is maximized if it’s usually discharged down to 45%-50% then recharged to full capacity soon after.

The time required to charge your AGM battery system will depend on the number of amps-per-bank that your charger can provide and the number of battery banks that need to be charged. That is if you wire several AGM batteries in series in stead of a single one, your system will take longer to reach full charge. And charging time can fluctuate in extremely hot or cold weather.

You can estimate charging time by dividing the battery’s capacity by the charger’s rating, and a good rule of thumb is to add about 10% for the extra time to for the battery to reach from almost full charge to full charge. For instance, you have a dead 100 ampere-hour AGM battery, and to recharge to 100% full charge at moderate room temperature (70°F or 21°C) using a 10-amp charger, it would take around: 100AH ÷ 10A × 110% = 11 hours. 

9. Do AGM batteries charge while I’m driving?

While you’re driving, the RV engine’s alternator will charge your AGM RV batteries. When you’ve reached your campsite, you can also plug into shore power or run a generator to top off your batteries.

10. How do you take care of an AGM battery?

Avoid repeated deep discharges. Avoid letting your batteries get below 80% depth of discharge, although the best AGM batteries are technically designed to withstand a 80% depth of discharge. On a regular basis, 50% depletion is the safe threshold. Top off your batteries as soon as possible by plugging into shore power or using a generator when you arrive at the campgrounds. Below 80% depth of discharge, hard sulfation will occur and will irreversibly affect its capacity to accept and hold a charge, and will shorten its lifespan. 

Know when to charge: To ensure a long life, AGM deep cycle batteries should be recharged when they are depleted down to 45% or 50% charge. Depending on your power consumption, you will need to regularly check the voltage of your battery using a voltmeter and over time, as well as estimate for yourself the average time that it takes for your AGM battery banks to cycle down to this threshold.

Slow charging is best: If your charger has damage protections in place and can be left plugged in 24/7, experts generally recommend charging the battery slowly over a 10-20-hour period at a moderate room temperature of 70°F or 21°C instead of trying to overcharging the battery to reduce charging time. The best AGM battery has thicker active plates, and this way, the acid has plenty of time to penetrate the places while also exposing them to minimal stress.

Use a four-stage deep cycle battery charger: A deep cycle battery charger is the right charger to efficiently maintain an AGM battery’s deep discharge and recharge cycles. This special type of smart charger will charge your battery in three or four stages. This stepped model allows more current to flow to the battery when it is deeply discharged, and then slowly reduces the charging voltage as the battery reaches full capacity. This serves to avoid overheating while optimizing charging time and maximizing the battery lifespan in the long run.

While you’re at it, find a charger that has the battery conditioning function. This maintenance function helps keep your AGM battery extra healthy while charging is underway. Many chargers also protect against overcharging, so you can leave the charger plugged in 24/7 without deteriorating your expensive AGM batteries.

Solar power for recharging: It’s worth noting that if you often boondock, installing solar panels is a sustainable solution for topping off your AGM batteries and making sure you won’t run out of power. 

Initial programming for the charger: The first time you bring your system online, depending on the model, you might need to program your chargers to the proper charging settings best suited for your battery bank. These settings dictate parameters like charging voltage and current. Refer to the manuals for your batteries and chargers for these specific settings.
Initial programming is crucial, since this is how you program “voltage set points”, or the different charging voltages that the battery will receive during each stage of the charging cycle. It is important to note that batteries typically charge in 3 stages—bulk, absorb, and float. Each stage requires the charger to be set at a specific voltage for optimal charging, which is based on the requirements of your specific battery pack.

Programming the voltage set points accurately for these three charging stages is absolutely critical to ensuring your batteries’ ability to hold a full charge, its overall long-term health and lifespan. There are also other important values to set during the initial programming, which are different for every battery, including max charge rate or charge current limit, maximum charging current, temperature compensation, absorb time and AC input amps.

When in storage: When you are storing your RV in the off season, keep the battery and charger away from extreme heat or cold, as both aren’t ideal for the battery’ and the charger’s components. And don’t rest the battery directly on the floor. Keep the Battery Disconnect Switch in the “batteries off” position. Another maintenance tip is during storage, you should disconnect the ground wire to prevent it from draining the battery.

11. What is the safety charging tips for AGM batteries?

Before starting your charging sessions, always make sure to remove the key from the ignition and switch off all lights and electrical circuits connecting the battery charger.
Make sure you clamp the positive cable to the positive battery terminal and vice versa. They are color-coded with corresponding symbols (positive: red, “+” and negative: black, “-”) for identification.

Before starting charging, remember to set the charger to match the battery type, that is AGM. Next, connect the cables of the chargers to the terminals of the battery: Clip the red clamp to the positive terminal (+ symbol), then clip the black clamp to the negative terminal (- symbol). After connecting the cables, connect the charge to the power outlet (110-120 volts AC). Now just turn on the charger.

Keep the battery terminals corrosion-free: The terminals are naturally prone to rust and the buildup of yellow-ish sulfuric acid residue, which would affect the battery’s performance. You should regularly check the terminals and clean them with a commercial battery contact cleaning solution and a small soft brush for scrubbing, or simply using a homemade mixture of baking soda and water. 

Only put on a battery charger while the battery or the terminals are completely dry. Doing so when moisture is present can cause a spark and ignite the battery, a potential fire hazard.

Try to keep the battery away from extreme heat or cold when charging and when in storage. You may notice charging times  fluctuating when it’s too hot or cold.

12. Do AGM batteries go bad?

Although AGM batteries are often regarded by experts as the best deep cycle battery for camping applications, they will eventually go bad and meet the end of their life. Proper charging and discharging using the right deep cycle battery charger, as well as less exposure to extreme cold, will maximize AGM battery life, of course.

Do note that all types of deep cycle batteries are lead-acid batteries, thus they run the risk of sulfation if left uncharged for too long without a trickle charger to keep it at full charge. Sulfation is a natural process that happens with every battery over time. However, if you store your AGM batteries in a discharge state for extended periods, rapid sulfation happens. Lead sulfate crystals will build up on the battery cells, causing the battery to accept far less current than normal. 

When this happens, you will need to increase the charging voltage during a charging session until the battery starts to accept the normal voltage level. If the battery does not respond, it may not recover from being in the discharge state for too long and thus needs to be replaced.

You can also find our guides on how to choose the best RV battery, best lithium battery for RV, best 6 volt RV battery, best deep cycle battery chargers, best trickle chargers with detailed reviews in RV Electrical category. In these reviews, we only include and recommend the best products with the highest ratings among highly sold products on the market.

Last Updated on October 4, 2021

Get more stuff

Subscribe to our mailing list and get interesting stuff and updates to your email inbox.

Thank you for subscribing.

Something went wrong.

Leave a Reply