This happen to me last week. The car had to be towed. I remember reading a thread posted by rob944s2
see the link http://www.e90post.com/forums/showth...=battery+cover
did not have any picture at the time. These are pictures from my car battery compartment. They replaced with a new battery positive cable and distribution box because the BST has blown and melted the power box. They also replaced the cover compartment that hold the tools.