RVs are fantastic for travel, camping or even as a small home on wheels. One of the most important parts of an RV is its battery, which acts as a power source when you are not connected to the mains or when there is a power outage. Like any other battery, RV batteries wear out over time and need to be replaced. In this article we will discuss everything you need to know about replacing your RV battery.

Table of Contents

Part 1: Common types of RV batteries

1.Liquid batteries (lead-acid batteries)

Liquid batteries (also called lead-acid batteries) are one of the most common types of batteries used in RVs. These batteries come in different shapes and sizes to meet the needs of different vehicles and are known for their fast charging speed and affordability. However, they require occasional maintenance by replenishing lost electrolytes with water, which can make them less convenient than other battery types. The lifespan of this type of battery is relatively short, with a cycle life of around 300-500. Therefore, you need to replace them after about three years of use.


  • They are relatively inexpensive compared to other battery technologies.


  • Heavy and Bulky: These batteries are heavy and bulky, making them difficult to install and handle.
  • Maintenance Required: Liquid batteries require regular maintenance, including adding distilled water to replenish lost electrolytes, which may be inconvenient for some RV owners.
  • Shorter Lifespan: These batteries typically have a shorter lifespan than LiFePO4 batteries, so they need to be replaced more frequently, increasing their long-term costs.
  • Lower Efficiency: Liquid batteries are less efficient than LiFePO4 batteries, which means they lose more energy as heat during the charging and discharging process.
  • High self-discharge rate: On average, a new and fully charged liquid battery stored at room temperature (25°C or 77°F) can self-discharge between 3-20% per month.

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2.AGM (Absorbent Glass Mat) batteries

AGM batteries are a great innovation in RV batteries as they can serve two functions: as a deep cycle battery and as a starter battery. They work by using fiberglass as a separator to keep electrolytes in place. AGM batteries are extremely shock resistant and have minimal internal resistance due to their tight packaging and good resistance to vibration. This low internal resistance reduces charge time and increases output voltage as energy flows through the battery.

AGM batteries are also known for their corrosion and acid free nature, making them possibly the easiest batteries to connect and install with minimal maintenance.

In addition, AGM batteries have a high capacity and there are models designed for efficient energy storage applications using solar power, making them a good choice for off-grid use. With proper maintenance, AGM batteries can outlast three conventional lead-acid batteries, making them an ideal choice for RVs.

AGM batteries also have a longer service life compared to liquid batteries. With proper maintenance, an AGM battery can last up to 5-7 years or even longer.

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  • AGM batteries are maintenance free and do not require regular topping up of water or checking of electrolyte levels.
  • They have minimal internal resistance, which means they can be charged and discharged more efficiently and can deliver high peak power when needed.
  • AGM batteries have a high capacity, which means they can provide a constant power supply over a longer period of time.
  • AGM batteries can function as both deep cycle and starter batteries, making them versatile and suitable for a wide range of applications.


  • They are sensitive to overcharging and require a specific charging profile, which can make them incompatible with some chargers.
  • AGM batteries have a lower energy density than other battery types, which means they may not be suitable for applications that require high energy storage capacity in a compact size.
  • They are not designed for deep discharge cycles. Over-discharging can shorten their lifespan, and they may not fully recover if discharged too deeply.
  • AGM batteries may require a higher voltage charger to complete a full charge cycle.

3.Gel Batteries

Gel batteries are a type of RV battery that is valve regulated and turns into a gel-like substance when its electrolytes are mixed with sulfuric acid and silica. This gel substance allows the battery to function similarly to traditional lead-acid batteries, the key difference being the addition of silica to create the gel mixture. Gel batteries are easy to install and maintain and require little attention due to their gel composition rather than liquid.


  • Gel batteries are sealed, which means they require less maintenance compared to lead-acid batteries.
  • They have a lower self-discharge rate, so they can be stored for long periods of time without being charged.


  • Gel batteries are more expensive compared to lead-acid batteries.
  • They have a lower energy density than lithium-ion batteries, which means they cannot store as much energy.
  • They can be damaged by overcharging or undercharging, which can shorten their lifespan.
  • You need a specific charging voltage and current, which may require a specialized charger.

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4.Lithium iron phosphate batteries

RV lithium iron phosphate batteries are lithium batteries specifically designed for use in recreational vehicles. These batteries are becoming increasingly popular with RV owners due to their many advantages over traditional lead-acid batteries.

One of the biggest advantages of lithium iron phosphate RV batteries is their high energy density, which allows them to store more energy in a smaller and lighter package. They are also extremely efficient and can be discharged and charged faster than lead-acid batteries. In addition, LiFePO4 batteries have a much longer lifespan than traditional lead-acid batteries, with some models lasting up to 10 years or more.

Lithium iron phosphate RV batteries are also characterized by their safety features, including resistance to overheating and short circuits. They are also eco-friendly, containing no toxic chemicals or heavy metals.

Overall, RV lithium iron phosphate batteries are an excellent choice for anyone looking to upgrade their RV power supply. They are efficient, durable, lightweight and environmentally friendly, making them a good investment for any RV owner who wants to travel off-grid without having to worry about running out of electricity.

Learn about the benefits of replacing RV batteries with LiFePO4.

Part 2: 6 signs it's time to replace your RV battery

1. If the check engine light comes on while driving and stays on while idling, it may indicate that your RV battery is not providing enough voltage or is exhausted, which can affect your vehicle's performance and safety.
2. If you hear gurgling or bubbling noises from your RV battery, it may indicate that there is a battery acid leak, which can corrode other metal parts of your vehicle and make it less safe to drive.
3. If your RV battery isn't charging or is charging slowly, it's time to replace it. In general, it is good practice to replace the battery every five years.
4. If the brightness of your headlights is reduced while driving, it is a clear sign that your RV battery is depleted and needs to be replaced.
5. A bad odor emanating from your RV battery, such as a putrid, sulfurous, or ammonia-like smell, could indicate a crack in the battery case leading to acid leakage and corrosion problems. This requires immediate attention and battery replacement.
6. If you find any cracks, holes or other damage on your RV battery, this is a sure sign for a replacement battery. Damaged batteries can leak acid, create unsafe situations, and possibly damage surrounding components.

Part 3: How to replace an RV battery - step-by-step instructions

Step 1: Disconnect power: When you replace a household battery, you usually have a main circuit breaker that ensures that all DC power supplies to your devices are off. Turn this switch to the off position. If you don't have a main circuit breaker, turn off all the individual fuses and switches that connect things like the lights, refrigerator, and TV. When replacing a starter battery, turn off the engine. (Disconnecting the power cords from the battery while the devices are in use may damage the devices).

Step 2: Open the battery cover. Check your owner's manual for the location of the household battery or starter battery. For safety reasons, it is recommended to wear safety goggles.

Step 3: First, remove the negative (black) wire terminal from the battery. For stubborn wing nuts, you may need a socket wrench or pliers. If the nut is overtightened, be careful not to damage it.

Step 4: Remove the positive (red) wire terminal from the battery. It is very important that the negative and positive wire terminals do not come into contact with each other. More importantly, don't touch the clamps with your hands; If you touch red and black at the same time, you close the circuit and can no longer enjoy your RV.

Step 5: Carefully remove the battery from the battery case to avoid straining your back. It is recommended to seek help as household batteries are very heavy. Starter batteries are easier to operate with one hand.

Step 6: Replace the dead battery compartment with a brand new battery.

Step 7: Connect the positive (red) cable terminal to the battery positive terminal post. Tighten the nut, being careful not to strip or damage the threads.

Step 8: Carefully place the negative (black) wire terminal onto the battery negative terminal post. Tighten the nut as in step 7.

Step 9: Make sure the battery is securely attached and close the compartment.

Step 10: For your starter battery, start the RV and off you go! For household batteries, turn the main circuit back to the on position and test your various fuses and switches to verify power.

Note: With household batteries, you can test the battery voltage with a voltmeter. If the battery reads more than 13 volts DC (VDC), it is in good condition. Batteries that cannot sustain more than 10-11 VDC should be replaced. If your battery shows low voltage, try charging it and retesting.

Watch the video to learn more.

Part 4: Benefits of replacing your RV battery with a lithium-ion battery

Replacing your RV battery with a lithium iron phosphate battery offers several benefits. Here are some of the benefits of using LiFePO4 batteries in your RV:

1.Higher energy density

LiFePO4 batteries have a higher energy density than traditional liquid lead-acid batteries, which means they can store more energy in a smaller space. This makes them ideal for RVs with limited storage space. For example, the energy density of Power Queen 12.8V 100Ah can be up to 1280Wh, while a lead-acid battery with the same capacity is about 35Wh/kg.

2.Longer lifetime

LiFePO4 batteries have a longer lifespan than lead-acid batteries and can last up to 10 years or more with proper maintenance. That means you don't have to replace your RV battery as often.

3.Less weight

LiFePO4 batteries are significantly lighter than lead-acid batteries, making them easier to install and transport.

4.Faster load time

LiFePO4 batteries charge faster than lead-acid batteries, meaning you can spend less time waiting for your battery to charge and more time enjoying your RV adventures.

5.No maintenance required

Unlike lead-acid batteries, LiFePO4 batteries do not require regular maintenance such as topping up electrolyte levels. This makes them more convenient and less time consuming.

6.Better performance in extreme temperatures

LiFePO4 batteries perform better than lead-acid batteries under extreme temperatures, including hot and cold weather.


LiFePO4 batteries are considered safer than lead-acid batteries as they are less prone to thermal runaway and fires. Power Queen's LiFePO4 batteries are also equipped with Battery Management System (BMS) to protect your safety.


LiFePO4 batteries are more efficient than lead-acid batteries, which means they lose less energy as heat during charging and discharging.


In summary, replacing your RV battery is an essential part of maintaining your vehicle's electrical system. Signs such as age, difficulty starting, dimmed lights and unusual noises can indicate it's time to replace your RV battery. The battery replacement process is simple, but it is important to take safety precautions.

Finally, switching to a lithium-ion RV battery offers many benefits such as a lightweight and compact design, longer lifespan and minimal maintenance. Whether you're looking to upgrade your RV battery or replace a worn-out battery, consider a lithium-ion battery for improved performance and efficiency.

Power Queen always offers you reliable products and excellent service. Don't hesitate to reach out to service.de@ipowerqueen.com if you have any questions.