How to keep your lithium iron phosphate batteries warm in the winter.
Lithium batteries should not be charged below freezing (32°F, 0°C) discharged below 0°F.
This is an inexpensive and very efficient solution to keep those expensive lithium batteries alive during cold temps.

12V Electric Blanket:
https://amzn.to/3FH3PoR

12V Power Outlet with USB:
https://amzn.to/3uK1gMq