How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't working properly, it probably just needs an upgrade to the battery. Also known as a coin battery, these can be easily replaced in just a few easy steps. Each fob is connected to a profile of https://autolocksmith96720.blogdosaga.com/30643269/how-to-make-a-successful-bmw-battery-replacement-key-guides-with-home