Object: A battery

Good morning, boys and girls. All of you know what this is, don't you? That's right, it is a battery. The battery gives a toy the energy it needs to perform. That's also true of flashlights and a lot of other things. But what happens after you have used a battery for a while? That's right, it starts to run down. Pretty soon it's not good any more and we throw it away because there is no more energy left in it. Of course, there are some …