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either leave the battery in and attached to shore power OR disconnect the battery and unplug the shore power while leaving the battery in the rv
charged batteries don't freeze, zero issues with the cold, but if you don't disconnect the battery the rv will draw it down and it will freeze at those temps
shore power for extended durations can be a bad deal, boil the battery(s) or cause a fire via equipment failure
I'm in ND, we have very cold winters, across the board we charge the batteries then disconnect the negative side, zero issues (rv's / atvs/ boats / vehicles / etc)
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