Recommended before or after seeing the "Key battery needs replacing" message on the car dashboard.
Compatibility (guideline only):
14 15 16 17 18 - 2 Series - First generation (F22, F45, F46)
09 10 11 12 13 14 15 16 17 18 - 3 Series (320i, 320xi, 328i, 328xi, 335i, 335is, 335xi)
14 15 16 17 18 - 4 Series - First generation (F32/F33/F36)
09 10 11 12 13 14 15 16 17 - 5 Series (528i, 528xi, 535i, 535xi, 550i, 550xi)
09 10 11 12 13 14 15 16 17 18 - 6 Series - Third Generation (F06/F12/F13)
09 10 11 12 13 14 - 7 Series (740i 740Li, 740 Lxi, 750i, 750Li, 750Lxi, 750xi, 760Li)
11 12 13 14 15 16 17 - X3 - Second generation (F25)
14 15 16 17 18 - X4 - First generation (F26)
Smart Key Replacement Genuine OEM Battery for 2, 3, 5, 6, 7 Series, X3 and X4 Smart Key Remote Controls l CR2450 3V