How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking it? This could be a sign that the battery must be replaced. To replace the battery, open the metal key with a flathead and pop the back cover open using a screwdriver. https://g28carkeys11756.iyublog.com/29331612/how-audi-a4-spare-key-changed-my-life-for-the-better