That's the beauty of lithium batteries. They have a BMS that prevents overcharging. Even if it's freezing they will stop charging to prevent damage. Now if they don't have a BMS then I suggest you get one.
What batteries did you get?
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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