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If they have a BMS they wont charge below 32 degrees. 12 volt tank heaters work great. You may as well disconnect the battery box vent pipe as lithium's don't require venting.
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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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