It is recommended to check the battery water level (if lead-acid type).
To check the water level in your RV battery, follow these steps:
Ensure Safety: Wear disposable rubber gloves, eye protection, and remove jewelry before starting. Work in a well-ventilated area.
Check Battery Type: Confirm your RV batteries are flooded lead-acid (wet cell) batteries, as this maintenance applies only to them. Some RVs use maintenance-free batteries (like AGM or gel), which do not require water checks.
Inspect the Battery: Remove the battery caps or covers to access the individual cells. Some maintenance-free batteries have caps that can be pried up, often tied together by a plastic bar.
Check the Water Level: Use a flashlight to look inside the fill wells. The water level should be at or just below the bottom of the fill well (vent tube). The minimum level required is at the top of the lead plates inside the battery. If the plates are exposed, the battery is damaged and may not perform correctly.
Add Water if Needed: If the level is low, add distilled water only to cover the plates. Do not use tap, purified, or mineral water, as minerals can damage the battery. It’s recommended to add water after the battery has been fully charged and is warm, as filling a cold battery can cause overflow when it warms up. The water level should be 1/8 inch below the bottom of the fill well for standard deep cycle batteries after a full charge.
Recheck After Charging: After adding water, charge the battery fully. Once charged, recheck the water level and add more distilled water if necessary to reach the correct level.
Secure the Caps: After checking and adding water, ensure all vent caps are securely replaced and tightened.
It is recommended to check the water level once a month, or after each trip, and more frequently if the battery is left on a charge.