How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't operating properly, it probably just needs an upgrade to the battery. They're also known as coin batteries and can be easily replaced in only a few simple steps. Each fob is connected to a profile of https://g2874607.suomiblog.com/the-complete-list-of-bmw-battery-replacement-key-dos-and-don-ts-46378412