Here is an eternal LED flashlight you can consider using, the NoPoPo Eco Water-Powered Flashlight Set, a Japanese company NoPoPo came up with water-powered batteries that can even use your own pee to power them. Now, this water-powered LED flashlight is available, all powered using NoPoPo water-powered batteries, way too cool. I suggest you to get one for emergencies. This LED flashlight lasts virtually forever!

The NoPoPo Mini Lantern is pure craziness: LED lamp powered with nothing but water! Simple to use, rechargable almost anywhere, and lasting up to ten years without losing charge, the NoPoPo is a perfect addition to any emergency kit Emergency-Kits-for-Business-Traveler , camping gear, survival set, and more. The versatile mini lantern can be used as either a LED flashlight or a unidirectional LED lantern; just slide the cover up to change modes.

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