flashlight batteryless warranty help

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My wife and I have seen these advertised on television — the ones you have to shake to get to work. She got one that I was neither one of us impressed with, which I figured was a knockoff of what may or not be a better one.

, I started seeing them as a good idea to have in a glove box, but I was wondering if anyone here has had any long term reports on how they hold up. I’m looking at one for my BOB but not sure if it’s worth the space.

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https://en.wikipedia.org/wiki/Flashlight