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My fob battery was still operating at the 2 year mark. There had been maybe 1 or 2 instances of key not detected warning, so perhaps early sign of weakness. At the time of my 2 year oil service last month the dealer changed the fob battery and left me a brand new battery in the cup holder to install in my other fob at home. Fob battery is Varta and was given to me in the BMW plastic bag with part number 66126912985, and says made in Indonesia.
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2020 540i MSport | Alpine White | Mocha Nappa | Aluminum Rhombicle | Exec Pkg | Luxury Seating | Bowers & Wilkins | Parking Assistance Pkg | MSport Brakes | Ceramic Controls | Space Saver Spare |  |