The recommended replacement battery is one CR2032 battery.
NOTE:
See www.dtsc.ca.gov/hazardouswaste/perchlorate
1. Remove the emergency key by sliding the mechanical latch on the back of the RKE transmitter sideways with your thumb and then pull the key out with your other hand.
Emergency Key Removal (IGNM)
Emergency Key Removal
2. Separating RKE halves requires screw removal (if equipped) and gently prying the two halves of the RKE transmitter apart with the emergency key. Make sure not to damage the seal during removal.
Remove Screw From Transmitter Case
Separating Ignition Node Module (IGNM) Transmitter Case
Separating Keyless Ignition Node Transmitter Case
3. Remove the battery by turning the back cover over (battery facing downward) and tapping it lightly on a solid surface such as a table or similar, and then replace the battery. When replacing the battery, match the + sign on the battery to the + sign on the inside of the battery clip, located on the back cover. Avoid touching the new battery with your fingers. Skin oils may cause battery deterioration. If you touch a battery, clean it with rubbing alcohol.
4. To assemble the RKE transmitter case, snap the two halves together.