Here is a pic of the bike, I would think that there are many bikes using this same setup, but I have searched the internet for a battery upgrade and so far have come up empty.
The descriptions of the ebike say it uses a 24 volt 8ah battery which has 7 cellshttp://urbanscooters.com/fhimage/indexshow.php?phto=XB-300Li
Hopefully you experts can guide me in the right direction.
PS, I just found this info on their online user manual, looks like it won't be that difficult:
"Whatâ€™s Inside Your XB-300Li Battery
The Battery is composed seven-cell, 8 Amp-hour capacity
batteries in series, for a total capacity of 24 V, 8 Ah.
The component batteries are a standard, commercially
available size. Keep this in mind, however, should you
choose to service your battery.
1) The batteries are soldered into place. Replacing
batteries will require soldering equipment and
2) Batteries can be extremely dangerous. If allowed
to short-circuit, they can cause burns, create
blinding arcs, or explode, causing serious injury. If
you accept this risk, work slowly, and exercise
utmost care! Work with only one wire at one time."