Harnessing the power of electricity is truly one of mankind's greatest achievements. From indoor lighting to smartphones, being able to use electrical energy to our advantage has completely changed the course of human history. This how to make a battery science project provides kids with a simple, inexpensive way to create their own homemade batter. Electricity is a form of energy that comes from charged particles. In nearly all electrical devices, negatively charged particles called electrons flow along a wire to create a current which is used to power the device. A wire that is not connected to a power source has no reason to create an electrical current. When batteries are connected within. All you need are a few simple materials to try this homemade battery: 1. Pennies(at least 5 if you would like to use your batteries to light up an LED) 2. Aluminum foil(only a small amount, about a foot (~1/3 meter) of length is needed) 3. Paper towels(about 1 square) 4. Vinegar (I used distilled white vinegar, but the type is not important. Could. To make your homemade battery, first tear a square piece of aluminum foil about 3 inches (8 cm) per side. Exact dimensions are not important. Fold the aluminum foil into a square about 1 inch (2.5 cm) on each side. Again, exact size is not important, but the square piece of aluminum foil should be a little bigger than a penny.Rip a piece of paper towel about the same size as the aluminum foil and fold it into a similarly sized square.