On modern Chevrolet key fobs, the key itself is used as a tool to help you swap out the old battery for a new one.

How to replace car key battery Most key fobs have a little slot you can use to pop them open with a small flatheaded screwdriver, a butter knife or another key.

Batteries fade and die over time, but but changing the cell in your Chevrolet key fob doesn't have to be difficult.