do you just occasionaly charge the battery or have a way of charging it while you ride?
i'm actually thinking on a (much much) simpler stereo/lighting system for one of mine. really just some scooter mirrors that have speakers built into them and a little more elaborate lighting than usual. i've read a little about bicycle charging systems but there isn't a lot of info so i'm always searching. like having the generator/dynamo work like an alternator that keeps a small 12v battery charged.