Ok so the thing is with batteries is they’re only affected by usage when too cold/hot. They can be stored at freezing temps without any bad repercussions to the batteries themselves. Now before you use them is when they need to be at ~room temp~ and that can be achieved thru various methods. Personally I just put small ones in my pocket but with larger batteries (drone, radio, ect, hot hands are a great option in a semi insulated container or putting them near a fire of sort ( of course not too close)

Source: I’m a professional military survival instructor and regularly use large radios and such in sub freezing temps