How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could be a sign that the battery is in need of replacing. To replace the battery, simply open the metal key with flathead, then pop the cover off with the screwdriver. https://g28-car-keys60472.bloguetechno.com/what-audi-a4-spare-key-experts-want-you-to-be-educated-65536428