How to Upgrade Your BMW Key 1 Series If your BMW keyfob doesn't function well, you might need an upgrade to the battery. These are also known as coin batteries that can be easily replaced in a few easy steps. Each key is linked to a profile of the driver https://car-locksmith29116.prublogger.com/30123211/how-to-tell-if-you-re-prepared-to-bmw-battery-replacement-key