How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could be a sign that the battery is in need of replacement. To replace the battery, turn off the metal key and use a flathead screwdriver to remove the back cover. https://carlocksmith75844.blogsumer.com/29379227/5-must-know-practices-of-audi-a4-spare-key-for-2023