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The Best RV Battery of 2020: Deep Cycle!

If you want to use electrical appliances while traveling in an RV, you will need a battery with adequate charge and capacity.

While a battery is a necessary component for any vehicle, it comes with technical specs that many buyers may find daunting. There are various questions to consider regarding battery usage.

For instance, which battery will allow you to power all of your appliances simultaneously? How do you charge the battery? Also, how will it react to temperature fluctuations?

The Best RV Battery

Battle Born Deep Cycle Battery
100 Ah
Vmaxtanks RV Battery
125 Ah
UPG RV Battery
35 Ah

1. Battle Born Batteries Deep Cycle Battery

This Lithium Iron Phosphate battery is the perfect lithium-ion deep cycle battery for your RV. In addition to the common 12-volt systems, the battery can work with 24, 36, and 48-volt systems. It is ideal for trailers, boats, golf carts, as well as any vehicle requiring off-grid power. We can use the battery in place of a lead-acid battery without requiring any rewiring. However, if you want to replace AGM batteries with it, you will need to carry out some minor adjustments.

The battery comes with the BattleBorn Battery Management System (BMS). It protects the battery’s lithium cells from sudden voltage changes, extreme temperatures, and short-circuits in the system. Thanks to the BMS, the battery can maintain its efficiency by reducing the charging rate for cells that have charged and by increasing the same for cells that still need charging. As a result the battery can maintain a balance between the cells.

The BMS also regulates the power output of the 100 AH battery. If any of your devices have a surge, the BMS will supply them with 200 amp for 30 seconds. It will be for half a second in case of higher loads.

2. VMAX Solar Deep Cycle Battery

The 12-volt 125 Ah battery is a reliable option for storing energy from solar panels, wind turbines, and inverters. Capable of operating efficiently in all weather conditions, it can power various electrical devices in an RV as well as boats, trailers and other vehicles. The battery’s plates are of heavy-duty tin alloy grids which enhance the battery’s performance and life.

The number of charging and discharging cycles that a battery undergoes determines its lifespan. During a discharge cycle, a battery’s discharge depth indicates how much of its power has been used up as compared to its capacity. A 100 percent discharge depth shortens the life of most batteries, but the Vmaxslr125 can go on for 300 cycles. And, with a 10 percent depth of discharge, it lasts for over 3,500 of them. The battery also has a low self-discharge rate of 1 to 2 percent per month.

Ninety-nine percent of the gas created in the battery recombines, and there is a valve to regulate its excessive accumulation.

3. Universal Power Group Battery

The Universal UB121000 is a 12-volt 100 Ah battery that is adept at storing energy and deep cycling. For this reason, the battery is popularly used in RVs, boats, and home solar panel applications. It also finds widespread use in hospitals, airports, and other places where deep cycle batteries are essential.

The battery uses a technology known as the Absorbed Glass Mat (AGM) technology. In AGM, a fiberglass mat absorbs the sulfuric acid in the cells and ensures that the battery remains spill-proof. Furthermore, the AGM makes charging quicker and increases efficiency by discharging less than 3 percent of the storage capacity per month. It also boosts the battery life and improves electrical reliability for consistently powering multiple devices in the RV at the same time.

4. Optima BlueTop Deep Cycle Battery

The lightweight BlueTop battery from Optima has a dual purpose. You can use it as a starting battery for RV and boat engines, and also as a deep cycling battery for powering various electrical devices. The battery's marine cranking amp of 870 amperes and cold cranking amp of 750 amperes can power the RV in summer and winter, respectively.

The 12-volt battery comes equipped with six cells. Each of these has a fully-charged voltage of 2.2 volts for deep cycling and just over 2.1 volts for starting use. The manufacturer has used proprietary SpiralCell technology to make these cells. This means each cell has a spiral winding of pure lead plates that have lead oxide coating. All the cells are inside precisely molded cylindrical cases. Thanks to these features, the battery can deliver more power in a safe, consistent way.

If a problem arises in the charging system, the battery’s reserve capacity of 120 minutes will supply power to the electrical devices in the RV.

5. UPG Lead Acid Battery

The UPG is a 12-volt 35 Ah sealed lead acid battery from Universal Power Group. Widely used as a secondary backup system, it can power emergency lighting systems, portable medical devices, security systems, electric gates, automated garage doors, UPS for computers, spotlights, and many other systems. Furthermore, the battery’s compact size and 24-pound weight make it ideal for powering small boats, kayaks, scooters, and wheelchairs.

Made with AGM technology, the battery excels at handling devices that consume a large amount of power. It has a fast recharge rate and can last for a long time when fully charged. Also, the battery’s leak-proof construction and regulated valves make it safe to operate in all weather conditions.

What to Look for in RV Batteries

rv batteries

Types of RV Batteries

Flooded RV battery

Also known as wet cell battery, it requires the addition of water to act as the electrolyte. It is the most commonly used RV battery as it holds its charge well and is affordable. Construction-wise, however, it may not be very durable.

AGM battery

Constructed of AGM, this is a lead acid battery that uses sulphuric acid as the electrolyte and requires no maintenance. Its design makes it both shock -resistant and spill-proof.

Lithium battery

This battery is long-lasting, lightweight, and fast charging. It can discharge 85 percent of its capacity and can deliver full charge even at high currents. Since a full discharge is likely to damage the battery, there is a BMS to monitor and take preventive measures. Lithium batteries require no maintenance as they don’t contain liquid electrolytes meaning their terminals won’t corrode.

Technical Specifications

RV batteries consist of metal plates immersed in electrolytes that work together to store electricity. The material, size, and quantity of these components determine the amount of energy that the battery can provide. The most common plates are lead coated with lead oxide and immersed in an electrolyte solution of sulfuric acid and water.

Battery Size

It may be tempting to install a larger batter to supply more power, you can't disregard space considerations. The battery must be the right size and fit your RV.

Battery Weight

As with size, the RV's battery weight also impacts its power. Usually, the heavier it is the more power it will be able to generate. However, it could also make the battery installation problematic.

Deep Cycle?

Since an RV requires more power than an ordinary car, you are going to need a deep cycle battery. Such batteries are powerful and efficient in energy storage. For this reason, they can power large vehicles with multiple appliances.

Installation Ease

Before choosing a battery, it can help to research the different models online and read their instruction manuals, if they are available. That should give you an idea about the ease of installation. It is necessary to know if you can personally manage it, especially if you've never attempted it before. In some cases, you only have to follow a few simple instructions. Others may require more technical knowledge.

Below is a quick video from Pete's RV going over the process. Check to see if the brand you opt for has installation videos. These are especially helpful for visual learners.

Power Capacity

You can deduce how much power a battery will generate by its amp hours and reserve capacity (RC). The amp hours cover a 20-hour duration and inform you about the total amps the battery can discharge in this time. The RC tells you the number of minutes the battery can last when providing a 20-amp output. Ideally, you should get a battery with higher amp hours and RC.

Life Expectancy

While RV batteries can last for many years, their actual lifespan will depend on how often and how much you use them. It's best to get a battery with a longer life span. Check the manufacture date and make sure it is current. Older ones may be close to expiration, and such batteries will hold little to no charge.

Temperature Considerations

Some of the RV battery’s charge will dissipate with exposure to high temperatures and that will lead to sulfation. In this, sulfate will start growing on the battery plates, and it will eventually hamper their performance ability. The battery will stop working as a result. Maintaining the battery at room temperature can resolve this issue to some extent.


Batteries should be efficient, reliable, durable, and compact. The best options will have a high reserve capacity and a long lifespan. Even so, to keep your RV safe and functional, you should check the battery, and, if necessary, change it. With a bit of maintenance, you can travel far in the comfort of your RV.


Richard Reed
I've been a General Manager of a moving company and I've also been a Professional Mover for over 30 years. I've driven flat beds, reefers, dropdecks, moving vans, heavy machinery, etc. In my time as a Mover I've driven over 1,000,000 safe miles. My days of moving and driving truck are past me but The Vehicle Lab allows me to share the knowledge I've gained over the past 40 years.

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