How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, simply open the metal key with flathead, then pop the back cover open using the screwdriver. https://g2868197.rimmablog.com/29342762/10-healthy-audi-a4-spare-key-habits