Charge USB with a Camp Stove
Did you know that you can fire to charge electrical devices? Thermoelectric Generators convert heat into voltage, and I got a tiny one that fits in my backpack and works great on my camp stove.
https://www.amazon.com/Ajirangi-Portable-Thermoelectric-Generator-Camping/dp/B00YPKY1ZQ
Ajirangi Thermoelectric Generator
survival