BMW Car key fob battery replacement 320 520 x1 X3 X5 x6 How to replace change remote keyless - DIY - YouTube
Amazon.com: Car Key Fob Replacement For BMW X3 X5 528i 535i 750i xDrive KR55WK49863 CAS4 Keyless Remote 315MHz FCCID:KR55WK49863;by AUTO KEY MAX (1) : Automotive
BMW X3 E83 Key Battery replacement - iFixit Repair Guide
How to replace / change key fob battery on BMW X2, X3, X4, X5, X6