Gravity Battery Mk1

Storing human power with Gravity, by way of a rewired hoverboard motor, and using it to light some LED's. It's a successful experiment, and how much farther can I take it? I'm not sure. Really I'm all about my turbine project, and this is just an interesting offshoot of my alternator research that I hope someone can make use of. This kind of system could be used to generate 25-50W, for probably an hour at a time, with only a few moments of human effort. It may also be possible to set it up with a furlable, fabric version of my turbine. You also could plug a 12V battery into it, and charge it, or cell phones, etc.