Thermo-electric generators.

I've built a couple of these portable generators for emergency preparedness kits. They are nifty for an electricity source on-the-go.

http://ift.tt/1q8ZBu0

The question I have is: Do you think a portable USB charger is practical for emergency prep kits, or should I focus on making them as a convenience product for campers? Thanks!

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Thermo-electric generators.