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 needs to be replaced. To replace the battery, you must open the metal key with flathead, then pop the cover off using a screwdriver. https://car-locksmith54274.blazingblog.com/29885180/what-s-the-reason-audi-a4-spare-key-is-everywhere-this-year