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I have a couple of flashlights that don't need batteries. One of them has a system that charges when you vigorously shake it for a (long) while, and the other has both a hand crank and a solar cell.
They don't meet your performance requirements at all, but they make me very confident that I can survive an apocalypse.
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I'm putting random letters here as a celebration of free speech: xigrakgrah misorojeq rkemeseit.
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