Lumen Eternal Flashlight
Edit: please note this project turned out to be fraudulent.
A flashlight with a dead battery is useless. But not the Lumen Eternal Flashlight, which uses a Thermoelectric Generator — essentially a small ceramic bar that produces electricity when provided with a temperature gradient — to power a single highly efficient LED. Lumen’s shell is made of either aluminum or titanium and also boasts an optional tritium rod (at a $15 premium) that perpetually glows and helps you locate the light in absolute darkness. Of course due to its limited power source it won’t be outputting ridiculous amounts of light, but the Lumen’s limitless nature make it perfect for emergency situations and as an all around basic flashlight.
Check it out at Kickstarter – $35