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By all means follow the owner's manual. HOWEVER, no manufacturer will write down anything that could be a liability. If a lead-acid battery is not fully charged or is connected to an on board circuit or is dirty it may get discharged and freeze which causes warranty and/or PR problems...

Lots of people here talk about taking their batteries inside in the winter. This is foolish. Lead-acid batteries don't like heat. Leaving a charged lead-acid battery in the cold is the best way to treat it. Disconnect the positive lead - not negative like most people think - so you don't...