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Take the battery inside on a trickle charger... If that battery goes dead, the liquid left is water. If it freezes, gets cold and stays cold, the battery water could crack the housing... I usually leave my tanks valves open . use compressed air at about 40lbs. open one faucet at a time till you get air out... Leave all valves and faucets open, if there is water inside, it will have space to expand along the water pipe.. leave the fridge open... maybe some moth balls near any where critters can get in.... lube doors and hatches... ..
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