How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could be a sign the battery is in need of replacing. To replace the battery, you must open the metal key with flathead, then pop the cover off with the screwdriver. https://carlocksmith78502.sharebyblog.com/30063337/say-yes-to-these-5-audi-a4-spare-key-tips