Pedal-powered generators already exist. Using one to charge a battery is better than this gravity-energy-storage gimmick in every imaginable respect, but they s

Pedal-powered generators already exist. Using one to charge a battery is better than this gravity-energy-storage gimmick in every imaginable respect, but they still are not used much, because electricity is not scarce. (If you can afford to buy a gimmicky generator, you can afford to buy a real one instead and the real ones are cheaper and better.)