The other night, after the late football game, my son and I got back to my house just to find that the clicker for his car had died. He looked up on YouTube how to open the fob and ask if I had a battery for the device, one of the flat round ones.
So I went to my battery junk box, and lo and behold I had the right kind of battery! He installed it, clicked away and was able to drive home up north.
Good thing I hadn’t gone through a deep cleaning mode and got rid of the old batteries in the box.