You would hope that there is someone that is a "battery geek" and somewhat innovative that would build some really good batteries for these lights. Seems like a pretty good money making venture. I would do it... but I would probably build a battery that is worse than the one that is already being sold (i'm not technically gifted in batteries and electronics.)

I guess it's time to fork over the money for a new wheel with the Schmidt hub and a generator powered light.