How does energy change from one form to another? Well, I'll tell you how. It all starts when the battery stores the chemical energy. You can use it for almost anything, but, when the music stops, the watch dies or the flashlight goes out, that means the battery is out of chemical energy. Most batteries nowadays are rechargeable. You just plug them in to a charger and the electrical energy goes from the plug in the wall to the portable battery! Just like that. A while after, you can once again crank up the tunes, play with the flashlight or tell time. Batteries are an amazing thing but, I think that car batteries should be smaller. To do that, all that we have to do is make the battery smaller by using less materials. I think that there should be a car battery charger. So that way, if there's an outlet, you will never again have to wait in the parking lot to come across one nice person who will give your car a jump.