Gather a small flathead screwdriver or coin and the correct replacement battery
Locate the seam or release slot on the key fob
Insert the screwdriver or coin into the slot and gently pry the fob open
Separate the two halves of the key fob
Remove the old battery
Note the battery type and orientation
Insert the new battery in the same orientation
Snap the key fob halves back together
Test the key fob buttons to confirm it works