If you are an outdoor enthusiast, you should be very familiar with the term “RV” (Recreational Vehicle). Just as its name suggests, an RV is not only a mode of transportation but also a haven for rest, offering you the comfort of a home. This is because an RV includes both a driving area and a living area. It is equipped with all the necessities for clothing, food, shelter, and travel, complete with sofas, refrigerators, air conditioning, televisions, bedding, stoves, and other facilities. So, what is the most important thing inside an RV? You probably know it! Yes, the most critical component of an RV is indeed the battery!

12V 100Ah Lifepo4 Battery

Lifepo4 Battery For RV

What Is An RV Battery?

There are many types of batteries, and the RV battery is one of them. The RV battery is the source of all power in the motorhome. In addition to providing power to all the appliances in the vehicle, it also serves as a power equipment to support the motorhome as it travels around the world.

What Is The RV Battery Used For?

The RV battery is mainly used in two aspects, which are:

Starting Battery

The RV battery serves as a starting power source, providing power for the vehicle to drive on the road. This type of starting battery is typically mounted at the bottom of the vehicle, also known as a chassis battery. It is similar to a standard car battery, with a 12V output, and it is very durable, enabling the RV to travel for extended periods on the road.

Home Battery

To power the home appliances on the vehicle, electricity is needed. When this power cannot be directly obtained from the outside of the vehicle, it has to be supplied by another type of RV battery. This type of RV battery is typically a deep cycle battery that can store power and convert it into electricity, maintaining the operation of appliances for a long time. Deep cycle batteries are also mostly 12V. If a higher voltage or larger capacity is required, they can be connected in series or parallel. To learn more about the knowledge of series and parallel connections, see “Series VS Parallel“.

How RV Battery Works?

RV batteries are primarily rechargeable batteries that supply power and electricity to the vehicle and its onboard equipment. They generate electric current through the chemical reactions occurring inside the battery, which in turn drive the vehicle’s engine. An inverter can convert the electrical energy stored in the battery into AC power, allowing you to connect household appliances for normal living.

Types Of Deep Cycle Battery

The energy storage system in a recreational vehicle (RV) typically utilizes deep-cycle batteries, which can be subdivided into the following three types:

Flooded Lead-Acid Batteries 

This is a commonly seen type of lead-acid battery. During daily use, it requires monitoring of the water level and timely watering to maintain the battery’s normal operation. Its energy density is not high, and both its weight and volume are sizable, with the possibility of leakage. However, the cost is controllable, and its performance can meet the operation needs of most devices. It is suitable for applications with a tight budget.

AGM Battery

AGM battery is a type of sealed lead-acid battery that uses a glass fiber separator to secure the electrolyte, which greatly reduces the chance of leakage. It doesn’t have stringent requirements for the installation direction, allowing you to prioritize the spatial concerns of your camper van. AGM batteries offer superior charge-discharge rates compared to other lead-acid batteries, have a longer lifespan, and require less maintenance.

GEL Battery 

It is also a sealed lead-acid battery, but it uses a gel electrolyte, which has a lower sulfuric acid concentration than AGM batteries, and the probability of liquid leakage is also smaller than AGM. GEL batteries have a long service life and a higher temperature adaptability than other lead-acid batteries.

Lithium-ion Batteries

Although lithium-ion battery technology emerged later than lead-acid battery technology, it has developed remarkably well. While the cost has not yet come down completely, its performance in all aspects is far ahead. For instance, lithium-ion batteries have higher energy density, making them smaller and lighter, possibly only one-third the size of lead-acid batteries. Lithium-ion batteries do not take up too much space in RVs, while still ensuring the vehicle’s stable progression, allowing you to enjoy a wonderful life. In addition, lithium-ion batteries require almost no maintenance and are environmentally friendly.

The most cost-effective among lithium-ion batteries is the lithium iron phosphate (lifepo4) battery. To learn more about lithium battery types, you can read this article“16 Types of Lithium Batteries

How Do I Choose An RV Battery?

You need to consider the following aspects:


This depends on the space the RV has reserved for the battery installation, as well as the amount of space you predict to allot for the battery. After all, the size and load-bearing capacity of the RV are fixed. The rest is how you arrange it such that it doesn’t burden the RV, while also making the RV appear more spacious.


When selecting a battery, you also need to consider the power consumption and output power of your electrical devices, such as air conditioners, refrigerators, televisions, etc. By calculating the size of your daily electricity usage, you can determine the ampere-hour capacity of the RV battery you need to purchase.

Service Life

How long do you plan to have this battery accompany your RV? Are you considering replacing it every 2-3 years, or do you intend to use it for a prolonged period? Lead-acid batteries typically have a life cycle of around 500 to 1000 cycles. Using a lithium-ion battery for 5 years is not an issue, and with technological advancements, it could even last for about 10 years.

Charging Rate

When using rechargeable batteries, what we most desire is for them to charge faster to avoid unnecessary time wasted waiting. The same applies to charging batteries for RVs. If you select lithium batteries as your RV power source, their charging speed should fall within your expectations.

Battery Cost

As mentioned earlier, the cost of lead-acid batteries is relatively low, while the purchase cost of lithium-ion batteries is higher. However, there is a clear difference in their life spans. You can compare their advantages and disadvantages in detail to choose a battery that fits within your budget.

Maintenance Costs

Flooded lead-acid batteries typically require watering to prevent corrosion, while other types of lead-acid batteries also need some degree of maintenance. Lithium-ion batteries, in comparison, are the most low-maintenance.

RV Battery Usage Frequency

The self-discharge rate of each battery varies. Some have a higher self-discharge rate and lose electrical power quickly, which may require frequent charging. If you only use your RV occasionally and the battery is left idle for extended periods, the power will deplete quickly, necessitating regular charging to maintain its vital signs. By contrast, lithium batteries have a lower self-discharge rate, followed by AGM batteries.

Additionally, you might need to consider whether your energy storage battery is compatible with your existing inverter. Nowadays, most batteries have high compatibility, and manufacturers can assist you with the setup. You should consult with the manufacturer for information.

How To Charge An RV Battery?

The difference with household batteries is that RVs cannot always use a fixed power supply point. If you are at home, you can connect directly to a power source. But if your vehicle is speeding on the road, then you can use the following methods to charge your RV battery.

Vehicle Engine

During the journey of a motorhome, the running engine can charge the batteries onboard.


Some motorhomes carry a small wind turbine generator or a portable generator, so that batteries can be charged even when far from a power source.

External Power

In outdoor or campsite areas with power outlets, connecting to external power via a cable can also charge the batteries inside the vehicle. If a charging station is available, it can be used to charge electric or hybrid motorhomes.

Solar Panels

Solar panels convert sunlight into electrical energy, which is then stored in the batteries.

How to  Maintain Your RV Battery?

Motorhome batteries come in different types, but the maintenance methods are quite similar. Here are some key points to get started with:

Proper Charging and Discharging

Charge the battery at the appropriate time. Lead-acid batteries should be charged when discharged to about 50%, while lithium-ion batteries should be charged when they reach around 80% discharge. It is not a good habit to frequently discharge to 100%, and it is not conducive to prolonging the battery’s lifespan.

It is advisable to use a charger that is compatible with your battery and to charge in the correct mode. During the charging process, it is important to routinely check the battery’s condition to prevent overheating or other adverse events.

Whether it’s a lead-acid or lithium-ion battery, overcharging and overdischarging can both damage the battery’s lifespan and pose safety risks. Therefore, it is recommended to pay close attention to the battery’s operational status. If you can equip it with Bluetooth functionality for real-time monitoring, that would be even more convenient.

Regular Inspection

If you are using a flooded lead-acid battery, it is necessary to regularly check the water level and timely add water to prevent overheating due to excessive water loss. In addition to the water level, you should also check for any leaking of the battery fluid. Other types of lead-acid batteries and lithium-ion batteries do not require water replenishment, but it’s still important to inspect the connections to make sure they are properly in place and to check for any signs of corrosion.

Long-Term Storage

If you only use your RV occasionally, the batteries are mostly idle. In that case, you need to regularly charge them to full capacity and store them in a temperature-appropriate environment. Before use, check the batteries that haven’t been used for a long period to see if they are functioning properly.

The Common Causes Of RV Battery Failure

Batteries are crucial for friends who rely on RVs for their basic necessities of clothing, food, shelter, and transportation. It can be very distressing if the battery malfunctions and there is no time for a replacement. To prevent this, we need to identify the early signs and stop the problem before it evolves. So how do you determine whether your battery needs repair or replacement?

  • The battery is bulging or even leaking fluid.
  • The battery fails to fully charge, won’t charge at all, or loses charge quickly.
  • The lights in the RV dim, and the engine revs slowly.
  • There are signs of corrosion on the battery casing.
  • The data obtained using a multimeter does not match the data provided for the battery.

If your battery exhibits any of these conditions, please do not ignore them. It’s important to stop and check your battery promptly.

The possible causes for these malfunctions might include:

  • The battery has reached the limit of its service life, with severe internal aging.
  • There is an insufficient amount of electrolyte in the battery, which hinders proper heat dissipation.
  • Daily cleaning is not thorough, or the battery is not regularly checked.
  • Overcharging and overdischarging affect the performance of the battery.

…and so on.

These are just some of the reasons why a battery may not function properly. Attentive care for the battery is essential for a comfortable RV experience.


How Many Batteries Does An RV Or Motorhome Have?

If your RV requires both a starting battery and a domestic battery, then you must have two 12V batteries. If your domestic battery requires a higher voltage or capacity, you will need to calculate the consumption of your devices. If you are unsure of how many 12V domestic batteries you need, we recommend that you consult with a battery manufacturer or contact us.

How Long Do RV Batteries Last? 

The usage time of an RV battery is related to the type of battery, battery capacity, and the total consumption of electronic devices. 

Should I Use a Deep Cycle Battery For RV?

Certainly. The best option for a motorhome is to use deep-cycle batteries, as they can withstand numerous deep charge and discharge cycles. Compared to regular batteries, they have a longer cycle life. Moreover, they come in various types, providing you with a broader range of options.

Can You Use Any Marine Battery On An RV?

In general, the two are not interchangeable. If the marine battery’s various specifications—including its chemical type, voltage, capacity, size, weight, durability, and safety—all meet the requirements of your motorhome. Then theoretically, it is possible to use this marine battery in your motorhome. Nevertheless, it is still best to use a battery specifically designed for motorhomes.

Are RV Batteries The Same As Car Batteries?

If they are both used as starter batteries, then the batteries for RVs and cars are actually quite similar. However, if we are comparing a car’s starter battery with an RV’s domestic battery, there are certain differences. Starter batteries need to provide a high current, whereas RV domestic batteries do not require a high current, but they do need to have a stable output.

Can You Leave Your RV Battery Plugged In All The Time?

It is best not to keep the RV battery constantly plugged in, as this can lead to overcharging and pose safety risks. Additionally, it is not conducive to extending the battery’s lifespan. But if your charger is capable of intelligently cutting off the power, then deep-cycle batteries could be considered for this practice. Of course, it is still best to consult your battery’s user manual.

How Do I Know What Size Battery I Need For My RV?

The size of the battery depends on the space inside your vehicle, energy requirements, and your budget. This involves the power of your equipment, usage time, and the type of battery.


Choosing the right battery for an RV can be quite a hassle. However, if you understand the underlying logic and know which factors to consider, it can become quite simple. This article should present such a train of thought.

If you want to take action immediately, you can learn about the types of RV batteries offered by Delong. They are all lithium-ion batteries With different appearances and energies.

12V 280Ah Wall Mounted Lifepo4 Battery For RV DL-LFP-RV12280
12V 200Ah RV Wall Mounted Lifepo4 Battery For RV DL-LFP-RV12200