How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could indicate that the battery needs to be replaced. To replace the battery, turn off the key made of metal and use a flathead screwdriver to pop up the back cover. https://autolocksmith17482.mdkblog.com/35752433/a-step-by-step-guide-to-selecting-the-right-audi-a4-spare-key