How to Save Money on Audi Battery Replacement Do you find that your Audi key fob have trouble locking and unlocking? This may be a sign that the battery must be replaced. To replace the battery, open the metal key and use a flathead screwdriver to open the back cover. https://g28carkeysolutions90697.blogkoo.com/15-best-documentaries-about-audi-a4-spare-key-49837227