Originally Posted by Horsehockey
For the right side battery cover, I recommend drilling a small hole near the bottom and securing the cover to the subframe downtube with a black zip tie. Lots of guys have lost that right side cover when the rubber band breaks. The left can't fall off, but the right sure will.
Yes. hence the newer right cover.
A buddy of mine uses two long zip ties instead of the BMW OEM rubber band. Cheap, simple, effective.