I agree with the summer battery thing. Right now i have 3 boat batteries and one rv battery on tenders right now and the classic will be soon also.My garage is insulated, heated only when I'm going to be out there. Also its attached to the house. Temp rarely drops much below freezing by much. Perfect for the summer vehicle batteries to winter over on maintainers! I wouldn't store any battery near a heat source, or in your living space. The fumes will cause problems, you don't want to be breathing them either!
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