Sorry, I didn't describe that exactly the way I meant. If the battery is in the car the battery will completely drain down till it's dead. If I move from the car to the truck, the truck will not start as well. I charged battery up in the truck and the truck starts fine. The battery has sit in the truck for several weeks and I just went and started it no problems. I expect later this afternoon the battery will be dead or maybe in the morning. That is what usually happens. Something with the car seems to be draining the battery. As long as the battery has a full charge the car starts and runs great.