This video looks at how to change the key battery on the new style of BMW car key. The battery is a CR2032 and it is very easy for you to change if you watch
BMW F11 520d (LCI) rear tailgate has decided it wants to work no more! The release mechanism is still functioning from what I can see but something is not opProduct description. 1 battery for BMW F series remote key buy here a lithium button cell with extra long durability for your BMW remote key. Suitable for all BMW F models. These batteries have a diameter of 24 mm. (CR2450) Battery regulation: waste batteries and old batteries must not be disposed of via normal household waste.
To fix this problem, replace the battery in your key fob. Once you change the battery, insert the key in the key slot to start the engine (donβt use the Start/Stop button). Stop the car. Remove the key and test the Lock and Unlock. They should be synchronized with the car and work properly.