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Are you sure it goes dry just sitting and not while it is running but you don't notice because you don't need the battery once it's running. If it is overcharging it will boil the battery, that would be a problem with the voltage regulator. Also the battery has a vent line that should just be open, if that got connected to a vacuum port it could suck the battery dry. If you see external leakage ruining the paint maybe there is something damaging the case.
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