science project

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i have a project i need help with. here is my idea. as most of you know i ride a pedicab,my pedicab has a headlight,tail lights,blinkers and brake lights. they all run off of a 12 volt battery under the seat. the problem is that i always end up with a dead battery if i dont charge it every other day...suddenly i came up with a great idea. what if i could charge my battery while riding my pedicab. i have seen the lights that rub on the tire and the faster you go the brighter the light gets but i dont think this would power all the lights i have. so anyone out there got any ideas?
one less car

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