How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking? This could be a sign that the battery is in need of replacement. To replace the battery, turn off the metal key and use a flathead screwdriver to open the back cover. https://auto-locksmiths85983.elbloglibre.com/30112302/15-interesting-facts-about-audi-a4-spare-key-that-you-never-knew