Learn to change the battry of Tesla key fob,save money for yourself. It is very easy to do,but many Tesla owner choose to buy a new key fob because they don't know how to change the battery. The battery change steps: 1.Prepare a new battery「2032 button battery for MODEL S,CR2354 button battery for MODEL X」,a Flat-Head screwdriver(or you can use your long fingernails) 2.Use the screwdriver to lift the lid of key fob lightly. 3.Use the screwdriver to pry the former battery off. 4.Pull the paper of the new battery apart. 5.Push the new battery in with your thumb. 6.Put the battery cover back.