Create a small electric generator powered by easily available fuel, perhaps butane, gasoline, or candle, which provides enough power to recharge a phone, USB 5 V 1.5 A (or 3 A for 2 simultaneously).
Surprised this doesn't already exist commercially. Existing portable generators typically produce much more power (and are big, loud, and heavy), while fuel cell versions are highly experimental technologies including failed companies.
Stirling engine. Should the cool side of a Stirling engine be blown by a fan powered mechanically by the engine, or powered by the electricity generated?
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