My issue is with my two house 12V batteries. I check my 3 (including chasis)each month for water. The last two months both house batteries and extermely low on water. We do not dry camp. We stay i...
Normal use causes the water to vent as fumes...that's why you need a ventilated battery box for non-sealed batteries. Do you have a 3-stage charger or are you just using the one that came with the RV? The stock equipment often keeps pushing a bulk charge to the batteries and can speed up the process. That's why folks recommend a battery tender when you're not using/maintaining the batteries often.
It's also why some folks use sealed batteries...almost no maintenance.
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