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-locksmith31467.blogdeazar.com/29989904/a-step-by-step-guide-for-choosing-your-audi-a4-spare-key