How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking it? This could indicate that the battery must be replaced. To replace the battery, turn off the metal key and use a screwdriver with a flat head to open the back cover. https://car-locksmith31264.ttblogs.com/9602925/how-to-find-the-perfect-audi-a4-spare-key-online