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Tried to start my 85 635csi today after sitting for about three weeks and nothing. I was sure it was the battery, but I had been starting it about one a week and lettiong it run. Well I jumped it and it ran. By the time a had removed the cables and moved the cars back to there spots (the 6er was left running while I was doing this)I went over to the 6er and it had stopped running. I tried starting it again and nothing. Is my battery not keeping the charge like I think. Do I need to jump it and then drive it, like most cars? If I plan on letting it sit like it has because of the snow can I disconnect the battery and reconnect it when I'm ready. Will that keep the battery alive. I know that it's less than 2 years old. Please help me.