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 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://auto-locksmith06184.blog2news.com/30786221/say-yes-to-these-5-audi-a4-spare-key-tips