Maintaining your RV battery is important or you will have a loss of power somewhere when you least expect it. Having this happen when you are enjoying a beautiful campsite a hundred miles from the nearest service is the last thing you want to have happen. Maintain the water level in the battery is one of the most important things you can do, but it is always seems like such a pain to do. This is no longer true if you use a battery water filler.
The design of the battery water filler is basic. You push down on the nozzle to release the water when the water being released into the battery reaches the nozzle the the container can not release more water. The water being release can not push up into the nozzle when you raise the nozzle up the release valve closes. Be sure to press down all the way when you are filling a cylinder. If you don’t press hard enough, it may not automatically stop the flow of the water. Just be careful to “seat” the filler tube squarely over the battery receptacles when you press down to fill. If it’s crooked, it could overfill. But, when properly “seated” it will fill the battery cell perfectly every time.
A battery is like a piggy bank. If you keep taking out and putting nothing back you soon will have nothing. Present day RV battery power requirements are huge. In the past trailers or motor homes had only a single 12-volt house battery, but today it is standard to have two or more house batteries and frequently they are powering inverters up to 4000 watts.
A battery needs to have the fluid level checked at least monthly, especially if the weather is hot. It’s important to regularly check the battery electrolyte (it really isn’t just water) level in your RVs battery, for two reasons: 1) because it naturally evaporates and 2) because a small amount electrolyzes into hydrogen and oxygen every time you charge the battery.
When you add water, use only mineral free water. Distilled water is best because all impurities have been removed, and there is nothing left that could contaminate your cells. Don’t overfill battery cells especially in warmer weather because the natural fluid expansion in hot weather can push excess electrolytes from the battery.
Also, make sure your battery is not labeled as “maintenance free.” If it is labeled “maintenance free,” it is not designed to be opened. Water cannot be added to this type of battery, they simply need to be replaced if they stop working well.
On top of the battery are typically two semi-rectangular plastic covers, used to seal each battery cell port. These can be removed by gently prying with a plastic putty knife or a screwdriver. Try prying from a number of points around the periphery of the cover if the cover does not immediately come loose.
If the electrolyte levels in the cells are low (plates are exposed), fill each cell to just cover the plates. Only fill to the maximum safe level — just touching the bottoms of the filler tubes — if the battery is fully charged.