How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This may be a sign that the battery must be replaced. To replace the battery, flip open the key made of metal and use a flathead screwdriver to open the back cover. https://carlocksmith73846.tblogz.com/why-audi-a4-spare-key-should-be-your-next-big-obsession-43946350