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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 is in need of replacement. To replace the battery, flip open the key made of metal and use a flathead screwdriver to pop up the back cover. Place a brand new CR1620 battery and then snap the shell back in place. Low Rate Locksmith Over time, it's typical for the batteries in key fobs to get worn out or die, which causes them to cease