Replacing the key fob battery for a 2015 Ford F150 is an easy project. It can be done with one tool, a small flat heads screw driver. I used the flat head screw driver on that famous red army knife. The fob itself takes one of those small, circular batteries. Size 2032.
The most difficult part of the project is popping the cover off of the fob.
Click here to see how I did it!