How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't operating well, it's likely that it requires a new battery. They are also referred to as coin batteries and can be easily replaced in only a few simple steps. Each key is associated with the profile https://g2851229.total-blog.com/a-how-to-guide-for-bmw-battery-replacement-key-from-start-to-finish-56001778