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How to Save Money on Audi Battery Replacement Are you experiencing issues with your Audi key fob not locking and unlocking? This could be a sign that the battery is in need of replacing. To replace the battery, you must open the key made of metal using a flathead and pop the back cover up using the screwdriver. Insert a new CR1620 battery and snap the shell back into place. Low Rate Locksmith Over time, it's typical for the batteries on key fobs to wear down or die, which causes them to stop working properly. A professional locksmith can sol