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no. only gets cold enough down in N Mississippi a couple weeks to really worry about flooded so we just leave them on the onboard 4 bank and charging . it will keep them warm and wont freeze. AGM and Lithium are the same. if your worried and dont want to to haul them out, get a animal light and put it in the compartment. we have done this and it keeps it above at a warm temp just put something at the bottom of the batteries as a insulator.