In Battle Born lithium batteries anyway, their cold weather circuit protection is designed such that the batteries cannot be charged once the temperature falls to 25 F, but then charging won't resume again till the temperature rises to 32 F.
Discharge can still happen though till the temperature drops to -4 F (yes, that's sub-zero).
They do make a version of their batteries now with built-in heaters to circumvent either issue.
Dave
https://battlebornbatteries.com/lead...e-paper-study/
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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