Biolite Campstove with Flexlight and USB output

The camp stove from the American manufacturer Biolite is both a grill and a portable power plant. A thermoelectric generator converts the excess heat from the grill into electrical energy. This allows outdoor enthusiasts to charge electronic gadgets such as smartphones, MP3 players, camping lanterns, or GPS devices while cooking, all without a power grid. The output power at the USB port averages 2 watts. Charging for 20 minutes provides enough energy for about an hour of talk time.