DJI Mavic, Air and Mini Drones
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Battery heating

I like these units. They have a good built in adhesive strong enough to leave on the battery during flight:

https://www.amazon.com/dp/B00S9D1FU4?pf_rd_m=ATVPDKIKX0DER

They last 8 hours and are priced right.
On my external batteries, I cutout this foam material to size and tape to the batteries with filament tape that sticks really good to the foam.

https://www.amazon.com/gp/product/B06XSBWDHF/
https://www.amazon.com/T-R-U-FIL-795-Filament-Strapping-Tape/dp/B01FYJKGS2/