“Very pleased, but be aware that although this fits a BMW Z4, it's not the same physical size or capacity as the OEM battery. There is a larger version available that I would have purchased had I realised. That said, it fits fine and starts the car first tickle every time. Oh, and the 'flat battery' problem I was having turned out to be a failing starter motor, not the battery. So I now have a spare 12V Z4 battery in my garage!”