Thanks Alex. Interesting reading. Makes me think of a time when I was in the Himalayas in a little hut which had so many holes I could see the snow outside. It was minus 15, and even my new torch batteries were flat, but if I warmed them up in my hands they would work a little longer. I guess it's all just chemical reactions, I guess.
I imagine in a box the heat the battery generates as it is used, in turn makes it more usable, by keeping temps higher.
Cheers
Markus
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