Originally Posted by soup325
just an idea...
why dont you use an 12V alternator from a small car/motorbike....fab up a chain drive...and bing.....some wires.....lots of juice for lights, sirens, and a phone charger or stereo.
They don't really make em small enough to use on a bicycle. I guess you could use a small motor and reverse the polarity. But I don't know if that is even possible.