How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't operating well, it's likely that it requires an upgrade to the battery. They're also known as coin batteries that can be replaced with just a few steps. Each key is linked to a driver profile, and https://g2823931.thezenweb.com/what-is-bmw-battery-replacement-key-and-how-to-utilize-it-68597679