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We make sure battery fully charged, if we cannot leave the unit plugged into shore power we disconnect battery (one of those disconnect switches). We have stopped taking batteries out of unit, boat, mowers, etc. Have yet to have one freeze, and if it is dead in the spring, it was weak and needed replacing anyway, so we replace. So far, this has worked well for us, don't want to be dealing with weak batteries, cold winter weather will tell ya if you got one!
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