How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking? This could be a sign the battery is in need of replacement. To replace the battery, open the key made of metal and use a flathead screwdriver to open the back cover. https://car-locksmiths21011.blogars.com/29272633/10-tips-for-audi-a4-spare-key-that-are-unexpected