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Amazon.com: 1PCS Replacement CR2450 Key Battery fits for BMW 1 3 4 5 6 7 Series X3 X4 M5 M6 GT3 GT5 Z4 F10 F12 Keyless Entry Remote Control Key Fob Battery : Automotive
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How to replace key fob battery BMW 5-Series F10, F11, 3-Series F30, F35, M3, F12, X5, X6, X4, X3, X1 - YouTube
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