I've been sliding a hand warmer between the battery and the foam on the backpack. I just activate the hand warmer before I leave the house. Went on a 2 hour trip last weekend and shot stills for 1 1/2 hours before I got the P3P out. The batteries were ready to go with an outside temp of 15F. If I get a chance today I will be flying it at 0F (or close to it).
I also use hand warmers on the back of my iPhone 6, which I am using for now. I have not had any issues with it in the cold. But with the reports I've read I decided to get an iPhone 6+ case, put 2 hand warmers in it, and my iPhone 6 on top. No issues so far. But I will be getting a dedicated tablet.
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