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How to Replace a Dead BMW Key Fob Most BMW owners will require changing their key fob batteries at some time. It's a simple task that will not cost a fortune. The key fob is powered by an ordinary CR2032 battery and can easily be replaced at a hardware store, online, or even an actual BMW dealership. Replacement Battery A lost key fob is more than a hassle to deal with. It can also be dangerous. You don't want to walk into your car, hit the unlock button, only to then find that t