Replace BMW Key Battery It might be time to change your battery if your BMW key isn't able to open your car or turn the engine. Fortunately, it's a simple fix. All you have to do is take off the key fob cover then carefully remove and replace the battery, https://thekeylab33144.thekatyblog.com/29295833/the-reason-bmw-key-fobs-is-quickly-becoming-the-hottest-trend-of-2023