Hi, last week when trying to start the E34, there was nothing much left in the battery, after it had been on the driveway fro appr 6 weeks. So I charged it with a car battery charger for a couple of hours. When it was full, it started and kept on running. This morning, I tried it again, but nothing. Not even the central locking system was working. And when I hook up the battery charger again, it shows "error". Is the battery gone? I think this model has the battery under the rear seats. Does anybody know how to remove the rear seats? And how to open the rear door when the central locking is not working? Should I try to jump start it? Thanks for your suggestions. Kim.