How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could be a sign the battery is in need of replacement. To replace the battery, flip open the metal key and use a flathead screwdriver to pop up the back cover. https://carlocksmith56198.blogpostie.com/52255446/why-audi-a4-spare-key-may-be-much-more-hazardous-than-you-think