How to Save Money on Audi Battery Replacement Do you find that 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, open the metal key with flathead, then pop the back cover open https://g28-car-keys26962.verybigblog.com/29734122/speak-yes-to-these-5-audi-a4-spare-key-tips