Hi guys I have a question about my batteries. After 2 days or so my truck barely wants to crank. Once it runs for 5 min. its good for the day. I just bought the truck and the batteries look pretty old. Do you think I have a draw on the battery or I just need two new ones? My other question is one of the batteries is quite a bit weaker than the other so will that suck the life out of the other one?