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I got the Dragonfly 100AH batteries on the new 2024 with 400system and they are supposed to have internal heaters. So far with several weeks of 20s and 10s temps we haven't have any issues. I have temp sensors all over and with the furnace on overnight 18degs, set at 68 the underbelly and battery compartment only get to 37deg low. I don't think i need to add anything additional at this point.
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Rick & Joyce Jones
RMC(SW) USN Ret.; AT&T Ret.
2024 3231CK, IS, 400W Solar, Slide covers, Predator Gen,, 2016 Chevy High Country 3500 Diesel Dually 
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