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Also, they are now making and selling a generator that uses a gravity battery generator for camping etc. You just hang it in a tree, lift the weight, and it slowly generates power until it bottoms out. They use a chain drive on the model I saw to allow for more customization of the battery length, and the device was compacted ridiculously small into the size of a wallet.
I guess in a sense, the model I saw was actually powered by the human energy of lifting the weight.