batteries are a little plastic cylinder that has this special kind of juice that helps power the batteries BUT YOU HAVE TO RECYCLE THE BATTERIES NOT JUST THROW THEM AWAY!!!! why because the juice inside the batteries is flammable and if it gets into the furnace then it will EXPLODE=http://=http://!!!!
If you want to make a battery then you will need:a zinc strip,copper strip a piece of a strong paper, rubber band,two small wires,copper sulfate(warning do not get on clothes or on human skin or in the body)and some tape also bend the strips almost 90 degrees away from the paper
Here's a video about batteries