How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't functioning well, it's likely that it requires an upgrade to the battery. They're also known as coin batteries and are easily replaced in a few easy steps. Each key is connected to a driver profile and https://carlocksmiths85397.bloggip.com/30756393/15-shocking-facts-about-bmw-battery-replacement-key-you-ve-never-known