There are chargers that utilize people's kinetic energy, then there are those that feed off of the sun's, the FlameStower Charger is one that harnesses power from the excess heat of flames. Although all of these options are great for those who can't be completely off the grid when enjoying the great outdoors, the FlameStower Charger is particularly useful.
Incredibly compact and easy to use, the FlameStower Charger simply needs the heat from a campfire to work. Compatible with all USB-powered devices such as cell phones and GPS systems, " it works by conducting heat to a thermoelectric generator, which is in contact with a water reservoir — the combination of hot and cold produces enough juice to charge your device in as little as three hours," according to Uncrate.
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