2. Pry open the cover of the key using a flathead screwdriver, and remove the cover . 257B83A9D7D8 3. Take out the battery and insert a new battery in its place. B0B391378D50 When installing the battery, make sure that the positive terminal of the battery is facing down. Battery model: CR2032 4. Install the rear key cover. After installation, make sure that all the key buttons are working properly. 18