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How to Save Money on Audi Battery Replacement Are you experiencing issues with your Audi key fob having difficulty locking and unlocking? This could indicate that the battery must be replaced. To replace the battery, turn off the key made of metal and use a screwdriver with a flat head to pop up the back cover. Insert a new CR1620 and then snap the shell back into the correct position. Low Rate Locksmith It's not common for the batteries in key fobs to go out of service or wear out over the course