This document provides instructions for building homemade water cell batteries that can power vehicles and home lighting. It describes using copper and aluminum plates or zinc foil in water with a small amount of chlorine or acid to create electricity. The batteries can be recharged by replacing the water. Safety warnings are provided to handle chemicals carefully and keep experiments away from children. Diagrams show different battery cell designs including those using copper pipes, aluminum cans, or copper and aluminum sheets sandwiched tightly together.