How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This could be a sign that the battery is in need of replacement. To replace the battery, turn off the metal key and use a flathead screwdriver to remove the back cover. https://auto-locksmiths22538.digiblogbox.com/55163642/5-must-know-practices-for-audi-a4-spare-key-in-2023