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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 could be a sign that the battery is in need of replacing. To replace the battery, open the key made of metal using a flathead and pop the back cover open using a screwdriver. Insert a new CR1620 and snap the shell in the correct position. Low Rate Locksmith Over time, it's common for the batteries on key fobs to get worn out or die, which causes them to cease fu