Been lazy with the ute as of late, and havent had the chance to drive it for about a month and a half, just sat in the shed. It has a very very flat battery. I now need to drive it on monday, so hooked up the battery charger and it wont charge at all, the charge light doesnt come on. The chargers working as i hooked it up on another vehicle to check. Whats this mean???, May have to get jumper leads on it, so it has a bit of charge and see if that helps???, any suggestions