thanks will bear that in mind if they don't replace it appreciated.you can use any 36v battery, as long as you have a place to put it on your bike. Ideal is to put a switch and a 30amp fuse between the battery and the controller. To make a fuse, just get one of those flat 30 amp fuses for a car, and solder male and female bullet connectors on a short piece of wire each side, and insulate it. You can use the sunlova switch.
Would you like me to have a go at repairing your battery (no cost from me)? If so, send me a pm with some contact details.