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Duracell crank flashlight. A good flashlight for an emergency? - duracell crank light

I prepare an emergency kit in the event of a disaster, if successful. I have a question about a crank flashlight.

1. How long crank flashlight (usually the case would be)? I have a flashlight crank Duracell .. You do not know if it will last forever. What happens when a disaster for another 20 years to be the case .. Flashlight Crank Power will still work?

2. Are there any other good flashlight for emergencies?

... http://www.amazon.com/Flashlight-Emergen