What type of battery does the RKE transmitter use, and how do I replace it?

The RKE transmitter uses a CR2032 or equivalent battery, inserted with the positive side facing down. To replace it, press the button near the bottom of the transmitter to remove the key, then use the key blade to separate the two halves of the transmitter and remove the old battery. Do not use a metal object to remove the battery, and avoid touching the circuitry to prevent static damage. (Page 41)