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The voltage profile of NiMH is different when it's cold. They probably won't be damaged from a grid charge, but a full pack won't top out at 180 volts if it's 0F, it'll be much higher and OP's grid charger may not be able to go high enough. Plus, I'm uncertain what goes on inside of them in extreme temperatures. I know my Insight's BMS does everything it can to prevent the batteries from getting low when it's cold out.
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