How to Upgrade Your BMW Key 1 Series If your BMW keyfob isn't functioning correctly, you might need an upgrade to the battery. Also known as coin batteries, they can be easily replaced with just a few steps. Each key is connected to a profile of the driver and every https://carlocksmith78502.sharebyblog.com/30610985/why-bmw-battery-replacement-key-is-the-next-big-obsession