The type of battery used in a Chevy Travere key fob is a CR2032.
The battery is 3 volt battery. The key fobs in the many Chevy models will run out of power after 1-2 years of use. When a key fob runs out of battery you can press a button on the side of the key fob to release a physical key (you’ll have to pull out). The door handle usually has a concealed lock that you can use to enter the car in case your battery dies. Each model car generally has a spot in the car where you can place the key fob on to allow it to start if the battery is dead. In a Traverse this is either in the cupholder or in the space in front of the cupholder that’s open and used for storage.