How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could be a sign that the battery must be replaced. To replace the battery, you must open the metal key with flathead, then pop the back cover open using a screwdriver. https://g28carkeys11756.iyublog.com/29379496/8-tips-to-increase-your-audi-a4-spare-key-game