Batteries, especially smaller ones for go-pro's and drones, perform poorly when they are cold or frozen. Even the larger lithium batteries for augers and drills begin to suffer when its really cold out.
I had a heated sweater that I no longer wore, due to excessive stains and wear. It was my go-to for working when I did roofing and other outdoor work in winter, as it was easier than layering up or down under a harness or tool belt.
Cut the sleeves and hood off in order to save space in the cooler bag. This setup houses: 1x18V 6Ah Milwaukee battery, 1x 12V 4 Ah battery with holder, 3 go-pro's with spare batteries and accessories, a dji mini 3 drone and a cannon R50, as well as other accessories.

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