Did it work and quit? Are you holding the start button after locking the vehicle? Do you have it disabled in the settings? Do you have a check engine light on? Is it the original remote with start button in the middle ( Not to the right )
and is only on when pressing a button, battery will last 5 to 6 years depending on use. You could leave the spare in the Trax and it wouldn't change a thing. A push start remote on the other hand has 2 transponders and is on all the time, lucky to get a year out of the little CR2032 coin battery. The push start FOB has a proximity sensor which the flip key doesn't have. I haven't had one in the shop for service yet so I have no pictures.