This document provides instructions for making a homemade battery using common household items. The battery is made using a plastic cup, strips of copper and aluminum cut from a soda can, soda, and alligator clips attached to wires connected to a voltage meter. The strips of copper and aluminum are placed on opposite sides of the cup filled with about 3/4 full of soda without touching. Alligator clips are then used to attach wires from the strips to a voltage meter to test the battery, which should read around 3/4 of a volt.