The Best Deep Cycle AGM RV Battery Reviews

As you search for new deep cycle RV batteries when your old ones no longer hold a charge, you’ve probably noticed that there are a lot of discussions about what kind of battery is best.

There is also no agreement on a certain kind or voltage.

Should you buy 12 volt, 6 volt, marine, AGM, GEL, or Lithium?

It is hard to determine what type of battery is best for RV use. The honest answer is lithium.

The average weekend camper is not willing to spend that kind of money on RV batteries because lithium batteries aren’t very cost-effective.

The first thing you may notice about my review is that there are no marine batteries to be found. I will review the best deep cycle agm batteries for RVs that are not lithium batteries.

Despite being technically deep cycle batteries, most marine batteries are also starting batteries, which means they are not true deep cycle batteries and will get damaged more quickly if they are used for RVing.

If you can’t find any other batteries at your local store, you can use marine batteries in an RV.

If you’re looking for long-lasting, lead-acid RV batteries, marine is not the way to go.

Also, amp hours are a big deal when it comes to RV use. The higher the amp hours the less affordable the camper battery becomes.

Its most affordable deep cycle RV batteries are around 35ah. With two batteries connected in parallel, it becomes 70ah for a total of 70ah. But it means buying two batteries.

A 12V battery with at least 50ah is recommended if you only need one. Otherwise, you’ll be draining your RV house battery constantly and it’ll wear out more quickly.

You’ll need to make sure there is space for everything before you buy new batteries for your camper.

Travel trailer batteries are stored in the front of my travel trailer, so make sure the boxes I use to store them are large enough for the deep cycle batteries I end up buying.

I’ll make sure to include links to the appropriate boxes for each battery I review.

Best Deep Cycle AGM RV Battery Reviews

1. Mighty Max Battery 12V 35ah AGM Deep Cycle Battery

Mighty Max Battery 12V 35ah AGM Deep Cycle Battery

Two 12 volt batteries connected in parallel can be affordable with the ML35-12 12 volt 35 amp hour AGM deep cycle RV battery.

A set-up like this is very common and one I use myself.

In the event that these 35ah AGM deep cycle RV batteries are connected, they will end up being 70ah, which will provide enough power to run the water pump, lights, fridge electronics, and fans for a couple of days.

It is common for deep cycle RV batteries to be connected in parallel with 12 volt travel trailer batteries.

All of the camper batteries reviewed in this review use AGM (absorbent glass mat) technology and are SLA (sealed lead acid) batteries.

Since AGM RV batteries have acid in them, they are still wet batteries, but they are sealed so they don’t require maintenance or water refilling.

In addition to being longer-lasting, they are also lighter than flooded lead-acid RV batteries.

There are 7.13 inches in height including the terminals, 7.68 inches in length, and 5.15 inches in width on the battery.

There is a slight difference in size between this battery and a group 24 deep cycle battery commonly used in campers, but it is likely to fit in the original box or storage area of your RV or camper trailer.

The Camco Standard Group 24 Battery Box is a perfect size and offers a little room to spare if you don’t have the right kind of weatherproof battery box.

The battery weighs only 23 lbs (10.5 kg) and comes with terminal screws for securing wiring because it’s an AGM deep-cycle battery.

As SLA RV batteries, Mighty Max AGMs fit in any position, are shock and vibration-resistant, and perform well under hot and cold conditions.

A great SLA RV battery for people who don’t often boondock/dry camp and prefer to stay in RV parks and campgrounds with electricity is the Mighty Max Battery 12V 35Ah AGM Deep Cycle Battery.

As a result, these will work for dry camping, particularly if you use two of them and have a generator or solar panel for charging.

PROS

  • Affordable
  • AGM/SLA
  • True Deep Cycle RV Battery
  • Can Be Mounted In Any Position
  • Lightweight
  • Maintenance Free

CONS

  • Low Amp Hours (35)
  • Two Required For Decent RV Battery Bank
  • Will Need To Be Charged Often When Boondocking

Buy on Amazon

2. WEIZE 12V 75ah AGM Deep Cycle Battery

WEIZE 12V 75ah AGM Deep Cycle Battery

WEIZE 12 volt 75 amp hour AGM deep cycle RV batteries are a common size found in campers and trailers.

With a weight of 46 pounds, it’s a reasonable size for one person to carry around. If you connect two in parallel, you’ll have 150 amp hours of power, which is enough for at least a couple of days of boondocking.

Approximately 10.24 inches long, 6.65 inches wide, and 9.17 inches tall, it is a group 24 battery.

With its terminal screws, this AGM deep cycle battery can be mounted anywhere and it is shock and vibration resistant.

Weize RV AGM batteries are a little larger than the 35ah deep cycle batteries reviewed above, but since they are standard group 24 batteries, they will still fit in the Camco Standard Battery Box (click to see it on Amazon).

What it really comes down to is what size you want and which brand you trust when buying AGM deep cycle RV batteries.

In terms of 12 volt AGM deep cycle batteries, WEIZE offers a couple of options in terms of size and amp hour.

This 75 amp hour version is perfect for campers, but there is also a 35 amp hour version (click to view on Amazon) and a 55 amp hour version (click to view on Amazon).

The 100 ah version of the deep cycle RV batteries weighs 57 pounds and has even more storage capacity.

When boondocking, RVers with solar panels or generators can use the WEIZE 12V 75ah AGM Deep Cycle Battery.

The fridge and lights can be run for a couple of days with two of them connected in parallel.

I recommend charging these every day to keep their discharge level from dropping below 50% if you are camping in cold weather.

PROS

  • Affordable
  • AGM/SLA
  • True Deep Cycle Battery
  • Can Be Mounted In Any Position
  • Maintenance Free
  • Good For Running Furnace At Night
  • Group 24 (Fits Most Standard RV Battery Boxes)

CONS

  • Best To Use 2 With RV

Buy on Amazon

3. Universal Power Group 12V 100ah AGM Deep Cycle Battery

Universal Power Group 12V 100ah AGM Deep Cycle Battery

The time has come to start looking at AGM deep cycle RV batteries that are ideal for extended dry camping, boondocking, and solar setups.

You don’t have to charge your RV’s 12V appliances as often as smaller RV batteries because the Universal Power Group 12 volt 100 amp hour AGM/SLA deep cycle battery offers enough storage.

The larger RV batteries like this one also reduce the risk of damaging your RV batteries by not going as low as you can. If you want to connect two in parallel, you’ll have 200 amp hours available.

After 50%, sulfuric crystals start to build up on the internal plates of all lead acid batteries, including SLA ones like AGM and GEL. This will cause the battery to lose charge over time.

Leaving batteries unused for long periods of time is one of the biggest reasons to replace them.

It is 12.17 inches long, 6.61 inches wide, and 9.16 inches high. This 100ah AGM deep cycle RV battery weighs 64 lbs.

In case you store the battery outside of your RV, you may need a larger box for it. The NOCO Group 27 Snap-Top Battery Box (click to view on Amazon) is a good choice.

For any camper battery needs, Universal Power Group batteries are a fantastic brand.

Other smaller options like 35 ah, 55 ah, and 75 ah can be found on Amazon if you don’t want to go as large as the 100ah reviewed here.

This article also reviews a 200 ah version.

Unlike lead-acid RV batteries, AGM batteries are shock- and vibration-resistant and can be mounted in any position.

It’s large enough that you only need one so long as you have a way to charge it when it gets down to 50% when boondocking. The Universal Power Group 12V 100Ah AGM Deep Cycle Battery has an awesome brand and size.

The size of this deep cycle RV battery is recommended for people who boondock/dry camp more often than they camp with electricity.

PROS

  • More affordable than batteries with slightly more amp hours.
  • AGM/SLA
  • True Deep Cycle Battery
  • Can be Mounted in any Position
  • Maintenance Free
  • Great for Boondockers/dry campers

CONS

  • Heavy
  • Might not fit in standard RV battery storage boxes and spaces

Buy on Amazon

4. VMAX 12V 125ah AGM Deep Cycle Battery

VMAX 12V 125ah AGM Deep Cycle Battery

This 12 volt 125 amp hour charge tank is manufactured by VMAX, a name well known to RVers and off-grid solar enthusiasts.

The battery is made for use with renewable energy sources like solar power and wind turbines, not as a marine starter battery.

This type of high storage deep cycle AGM battery is perfect for RVers, especially those who primarily dry camp or boondock.

In accordance with VMAX’s marketing, the float service life is eight to ten years. RV batteries have a very long float life compared to lower quality AGM batteries and flooded lead-acid batteries because RV batteries are rarely under continuous charge.

The kit includes all the hardware necessary to connect it to the wiring in a standard camper.

There is a very considerable 75 lbs of weight in this battery. There are 12.9 inches long, 6.8 inches wide, and 8.7 inches high. It fits in the Camco Group 31 Battery Box (click to view on Amazon).

Despite being less affordable than smaller AGM deep cycle RV batteries, the VMAX 12V 125Ah AGM Deep Cycle Battery provides a high amp-hour capacity and the good reputation of the VMAX brand.

If you camp out in the wild without batteries stores nearby, a good brand matters when it comes to batteries.

VMAX also makes smaller AGM deep cycle RV batteries if 125 ah seems excessive.

There are four different options you can choose from: 35 ah, 60 ah (view on Amazon), 85 ah (view on Amazon), and 100 ah.

PROS

  • AGM/SLA
  • True Deep Cycle Battery
  • Can be Mounted in any Position
  • Maintenance Free
  • Great for Boondockers/dry campers
  • Long Life Span

CONS

  • Heavy
  • Might not fit in standard RV battery storage boxes and spaces

Buy on Amazon

5. Universal Power Group 12V 200ah AGM Deep Cycle Battery

Universal Power Group 12V 200ah AGM Deep Cycle Battery

My last post covered all the best AGM deep cycle RV batteries that are the most common size for RVs, but today I wanted to explore another option for RV owners or solar enthusiasts.

It measures 20.75 inches long, 8.11 inches wide, and 9.65 inches tall. It is a huge deep cycle battery that can deliver 200 amps of power.

You can boondock/dry camp for days without having to recharge this battery, even if it’s too large for my travel trailer’s front battery storage area.

The weight of the unit is 114.6 lbs, which is a lot for one person to handle, so make sure you have enough lifting power and people to move it.

This battery is also quite heavy, which is one of the reasons many people prefer 6 volt batteries in their RVs, which I will cover in the following product review.

If you decide to install two of them in parallel, it would give you 400 amp hours of power, which is an attractive option.

AGM batteries are great for RVs, boondockers, and other people who have solar panels. They can be mounted anywhere and have shock and vibration resistance. They are also great for home use.

In spite of its size and weight, the Universal Power Group 12V 200ah AGM Deep Cycle Battery is a well-made battery that may be the ideal option for your camper or solar setup.

PROS

  • AGM/SLA
  • True Deep Cycle Battery
  • Can be Mounted in any Position
  • Maintenance Free
  • Great for Boondockers/dry campers
  • Awesome for solar set-ups
  • An affordable option for large amp hour batteries.
  • Easy to wire two in parallel for RV use.

CONS

  • Extremely Heavy
  • May be difficult to find storage space for it in an RV

Buy on Amazon

6. VMAX 6V 225ah AGM Deep Cycle Battery

VMAX 6V 225ah AGM Deep Cycle Battery

It can be difficult to determine if 6 volt RV batteries will be a better choice than 12 volt RV batteries since there are a lot of myths and stories surrounding them.

Though 6 volt batteries are more durable and can withstand being charged and discharged more than 12 volt batteries, the main question is whether the difference is significant enough to warrant opting for this much less affordable battery type.

It is important to realize that if you are going with 6 volts, you will need at least two to run your RV. One will not suffice.

A 6 volt battery can be converted into 12 volt power by connecting two in series to double the voltage. This is different from combining two 12 volt batteries since the amp hours will remain the same.

The combination of two of these 225 amp hour 6 volt batteries will still give you 225 amp hours of power. That being said, if you have four of them, which many RVers do, then you will have 450 amp hours of power.

There is an article here explaining the differences between 6 volt and 12 volt batteries so I won’t get into details in this review. If you’ve decided on 6 volt batteries, then I highly recommend the VMAX 6 volt 225 amp hour AGM deep cycle battery.

AGM batteries manufactured by VMAX are some of the best on the market today. One battery measures 9.5 inches long, 7.3 inches wide, and 11 inches high.

These will require a different box if you previously used 12 volt RV batteries.

You can also get large dual 6V battery storage boxes such as the Camco Heavy-Duty Double Battery Box as well as the NOCO 6V Snap-Top Battery Box (click to view on Amazon).

A VMAX 6V battery weighs 71 pounds, which is another reason why 6V batteries are so popular. You end up with the same number of amp hours with two 71 lbs batteries instead of one 114 lbs battery.

AGM deep cycle batteries such as the VMAX 6V 225ah are built to last. When float-served, they are expected to last 8-10 years. The VMAX is an AGM battery that is shock and vibration-resistant. If 6 volts is your preferred voltage, you can’t go wrong with it.

PROS

  • AGM/SLA
  • True Deep Cycle Battery
  • Can be Mounted in any Position
  • Maintenance Free
  • Great for Boondockers/dry campers
  • Lighter than other 225ah battery set-ups
  • Will fit in most RV battery storage areas

CONS

  • Least Affordable Option
  • Must have two for RV use
  • If one fails RV will have no battery power

Buy on Amazon

Frequently Asked Questions About Deep Cycle RV Batteries

What are cranking amps?

A starting battery is commonly referred to as a cranking amp.

The cranking amps are the number of amps a battery can produce in 30 seconds at 32°F (0°C). The higher the cranking amps, the better a battery is at starting motors in cold weather.

You don’t need to worry about cranking amps for RV batteries, and if you’re looking at a deep cycle battery that has cranking amps listed, chances are it’s a “starting” deep cycle battery, which is not ideal for RV use.

What does “ah” stand for?

AGM batteries are categorized according to their amp hours, or AH, which stands for ampere hours. Amp hours measure a battery’s capacity.

How do I calculate watt hours from amp hours?

You calculate watt hours by multiplying the battery’s voltage by its amp hour capacity.

The watt hours of a 12 volt battery with 100 amp hours are 1,200, while the watt hours of a 6 volt battery with 100 amp hours are 600.

Will my RV charger charge AGM batteries safely?

Battery chargers should be used to charge AGM batteries so they do not become damaged during charging.

The best battery charger for AGM batteries is a three stage charger. Most RV’s don’t have smart chargers that have options for battery type. Most do have three stage chargers for AGM batteries.

It should be possible to check what type of charger is in your RV’s converter/charger in the manual.

The battery charger in my 2013 Heartland Prowler is the WFCO WF-8900 Series.

Despite not being able to choose the type of battery on the charger, I won’t bother changing the charger since it’s 3 stage and won’t damage the battery too much.

A good battery charger will not only charge your batteries safer and faster but will also extend their life, which will save you money in the long run. If you have an older RV, I recommend that you replace the converter/charger.

How long will my RV batteries run the furnace?

There is another post about how long RV batteries can run a furnace available here if you would like to find out more about this excellent question.

Why isn’t my deep cycle RV battery charging?

Battery chargers are one of the many RV parts that can malfunction. If your RV battery or batteries won’t charge at all even when plugged into power, it’s probably the batteries themselves.

You need to check the terminals first. They must be clean and securely attached to the RV. Also, check the ground wire. If it is loose, the batteries will not charge.

The battery cutoff switch may be located on some campers; check your RV manual to see if it’s there and make sure it’s not turned off.

The next step is to test the battery and the RV charger/converter. An external battery charger is necessary for this.

The RV charger/converter is the problem if it stops charging once you unhook your RV from the batteries.

Usually, RV converters and chargers are situated under the fuse box. To access the converter, you must remove the cover.

If any wires leading to the converter box are loose, make sure all power is disconnected from the RV, especially the batteries.

Normally, RV battery chargers and converters don’t go bad, but if they do, you need to find their model number and find the appropriate replacement part.

It’s possible that your charger is not designed to charge lithium-ion batteries. This could be why it’s not charging.

You will also need to replace the converter/charger if you want to replace the lead-acid batteries in your RV with lithium batteries.

The Lithium-ion replacement converter/charger for WFCO WF-8900 series can be found on Amazon.

You may not be able to switch back to traditional lead acid batteries if you go with lithium RV batteries and replace the converter/charger.

Why is my deep cycle RV battery draining?

The RV uses a large number of 12 volt appliances, so even if everything seems turned off, your camper’s batteries can be drained relatively quickly.

12V power isn’t exclusively used by lights and water pumps, as is commonly believed.

The RV fridge will consume around 250 watts a day for the thermometers and electric starter, while the water heater will also consume electricity even when in gas mode.

It is possible that your batteries are damaged and no longer holding a full charge if they seem to drain so fast every day.

The longer you drain deep-cycle lead-acid RV batteries, the more likely they are to suffer from damage, and they won’t be able to hold a full charge.

Your 12V RV appliances may lose more power in cold weather since batteries are less efficient in cold weather.

Why is my deep cycle RV battery boiling?

Your RV batteries may be boiling if they smell like rotten eggs or emit vapor.

Batteries that boil only occur when they’re receiving some kind of charge. If you notice that your RV batteries are boiling, unplug your RV from shore power or disconnect your charger.

If you want to open up the battery, wait until the acid has calmed down and wear gloves and old clothes because battery acid is very corrosive and can damage your clothing.

It is very important to keep flooded lead-acid batteries topped up with distilled water regularly. If the battery is boiling when being charged by your RV, the most likely cause is low water.

It is probably a bad cell that was damaged due to the lack of water, and the battery needs to be replaced if this doesn’t fix the problem.

Where should I store my deep cycle RV battery in the winter?

The best way to store an RV battery during the winter is inside; some say that storing it on cement drains it, others say it doesn’t matter.

It is always a good idea to place the battery on cardboard or a few pieces of wood for safety reasons.

The most important thing to keep in mind when storing an RV battery is to keep it charged all winter long. However, overcharging a battery can be just as harmful as letting it go flat.

The best battery chargers to use for winter storage are those listed here (click to view post).

A smart charger won’t allow your batteries to overcharge, and some have a repair mode that works to clear sulfuric crystals.

When should I replace an RV battery?

A battery that is often left below 50% charge may get damaged faster and go bad over time.

A smart charger can be used to boil your camper batteries and remove the sulfur crystal buildup that has damaged the battery. If this fails, you will need to purchase a new battery.

How long does a deep cycle RV battery last?

Depending on the type of battery and how well it’s maintained, the life of an RV battery can be short or long depending on how often it’s discharged.

AGM and gel batteries are more durable and easier to maintain than traditional flooded lead-acid batteries.

As a result, flooded lead-acid batteries that are kept charged at 50% should last for years and years. Batteries that aren’t maintained may not last as long.

In spite of the fact that AGM and Gel batteries do not require maintenance, they still suffer damage when they are discharged. The lower the discharge level, the deeper the damage will be.

You can get around 7 years of life from deep cycle batteries if you don’t allow them to go below 50% if you keep them at full charge for 10 years.

My suggestion is to make sure your AGM or GEL battery is charged the correct way by getting a battery charger with an AGM or GEL mode (click here to read about best smart deep cycle battery chargers).

It is important to quickly recharge an AGM battery if you discharge it down to 20%.

It is due to this that lithium-ion batteries are so popular with solar and off-grid systems because they will last the longest even if they are discharged to 20-30%.

You should change your RV charger/converter if you want lithium-ion batteries for your RV since an incorrectly charged lithium-ion battery will deteriorate.

Conclusion

If you choose a high-quality AGM battery over a traditional flooded lead acid marine battery, you should save over the long haul.

The batteries last longer, are more resistant to vibrations from travel, and weigh less.

You really need to take into account the amount of dry camping/boondocking you do before you choose what size to go with. If you have a solar panel that can recharge your RV house batteries daily you can get away with a smaller size but if you want to be able to camp for days without worrying about how much charge is left a larger amp hour battery is a better choice.

Here is an article that may be of help to you when deciding between 12 volts and 6 volts.

This battery weighs only 64 lbs, which is fairly manageable, and you get a lot of amp hours.

Travel trailers will need a box that is slightly longer than the battery storage area for the battery since it’s not much larger than a typical RV battery.

In addition to being maintenance-free, AGM batteries are shock and vibration-absorbing, and will last much longer than their flooded lead-acid counterparts.

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