How to replace the battery in an Audi A6 Remote Key?

I recently purchased a used Audi A6 and the remote key seems to be dying. How can I replace the battery in the remote key?

To replace the battery in your Audi A6 Remote Key, locate the small button on the back of the key and press down on it. This will release the key from the case. Then, carefully remove the key from the case and you will see the battery compartment. Replace the battery with a CR2032 coin cell battery. Reassemble the key and it should work like new!