How to Upgrade Your BMW Key 1 Series If your BMW keyfob doesn't function properly, you may just need an upgrade to the battery. Also referred to coin batteries, these can be easily replaced in a few simple steps. Each key is linked to a driver profile, and each key https://g2823931.thezenweb.com/what-is-bmw-battery-replacement-key-and-how-to-utilize-it-68597679