Non comfort access key battery life - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
How to change / replace smart key fob Battery BMW 1, 3, 5, 7 series & X5 FCC KR55WK49147 - YouTube
How To Change BMW Key Battery | Competition BMW of Smithtown