How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could be a sign the battery is in need of replacing. To replace the battery, simply open the metal key using a flathead and pop the cover off using the screwdriver. https://g28-car-keys43406.canariblogs.com/how-audi-a4-spare-key-influenced-my-life-for-the-better-45441630