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How to Save Money on Audi Battery Replacement Do you find that your Audi key fob experience difficulty locking and unlocking? This could indicate that the battery must be replaced. To replace the battery, turn off the metal key and use a flathead screwdriver to remove the back cover. Insert a new CR1620 and then snap the shell back into the correct position. Low Rate Locksmith Over time, it's common for the batteries in key fobs to wear down or die, causing them to stop working properly