I have 2 12 volt battery's for the house. When I am hooked up to shore power one battery is real hot and one is not. Do I have a bad battery or is my charging unit over charging?
Replace them but a voltmeter may have given you advance warning. Load testing could also be helpful. And if not sealed a hydrometer should reveal a bad cell.
Don't delay and be very careful as batteries can explode.
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