Thanks for the suggestions. I think it's below 4 volts so won't charge. I boosted it today but it took a few mins and had to keep revs up on the boosting car. Also would stall out when disconecting the cables so had to leave the cables on for a few mins also. I let it run for a bit to get the charge up then put a charger on it so hopefully that works. Could it be a bad battery maybe?