Pull the cord five times, or shake one up for 90 seconds, sounds like a novelty, but it's how you turn on a battery-free flashlight. Not only do they have the benefits of a long-lasting LED bulbs, but they run without batteries. How they work is through magnetic induction and dual coils that when shaken charges a capacitor instead of a battery. The Shakelight 60 is one model available at www.generationgear.com. It seems to be one of the best, where 90 seconds of shaking allows for 60 minutes of usable light. Light dims and fades for an additional hour afterwards. If you shake it for 10 seconds, the light lasts 10 minutes. To recharge, all you do is shake it again. The light working range is about 30 feet. It sells for 19.95. The 3-LED Dynamo battery-free flashlight works by pulling a cord five times, and retails for 5.96. The light range and usable light time varies respectively with all the models. There are some models that can provide a light range up to one mile. Check out overstock.com for more values, but be sure to look for battery-free not just LED. Finally, a flashlight that can hide out in your car, storage or emergency kit and still work on demand.
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I have used two of these flashlights. Both of them were dissapointing. In just a short period of time they were not giving good bright light and loosing their charge more and more quickly. I am anxiously awaiting the second generation of these poor performers.