Found this item on ebay. 12V power rechargable power supply. It is small enough to tuck up under my seat. I took the pictures aimed up, when standing over the bike you can't see the battery at all.
damm, wish i saw that yesterday, cause i just ordered 12 aa size ni-mh batteries to make my own 5ah pack. this would have been so much easier. oh well might order one anyway, thanks red