I think you are talking about and EV Global Ebike. Very nice bike. You seem to have the 36V model with required a special battery.
Most likely your battery is 7-8 years old and has gone bad.
You can use 3 standard 12V 7-8AH SLAs but one will have to be outside the box.
An alternative is to ditch the SLAs and buy a Lithuim cell. I hear that ping on ebay makes custom packs that will fit the required dimension.
I love this bike and would be willing to buy any parts you don't need or replace.
As for parts they are getting more expensive and harder to find. The chassis is solid but the electronics are not. The hub motor is made by Heinzmann which is a geared brushed motor. on the 36V model it spins the one way bearing. Always pedal first before applying power to reduce the stress on that
bearing. Also apply throttle gradually and not fully from a dead stop. If you do so the hub will last for ever. Otherwise it will become useless.
Here is a place that carries parts for an arm and a leg.
Last edited by gmouchawar; 08-20-08 at 10:42 PM.