I havent been able to ride the across for a few days and I thought it would be a good idea to start it and let it run for a while. I tried to start and it kept cranking but wouldn't kick over. Couple with fact that the headlights weren't helping, it eventually ran out of juice. So I tried roll starting it a number of times down my driveway and each time managed to start the engine but it would then stall within 2-3 seconds. I have no knowledge about motorbike batteries, just wandering if they can be jump started from a car battery and if not, is it hard to install a new battery yourself? Also, I built this 12V battery charger thing at tafe last year and was even considering trying to use that. Any help would be great. Cam.