How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This could be a sign that the battery is in need of replacement. To replace the battery, open the key made of metal using an flathead and then open the cover off https://g2881892.ampblogs.com/5-reasons-audi-a4-spare-key-is-actually-a-good-thing-66668080