The document describes the composition and functioning of a nickel-cadmium (NiCad) battery. A NiCad battery consists of a cadmium anode, nickel oxide cathode, and potassium hydroxide electrolyte. During discharge, cadmium oxidizes to cadmium ions at the anode and is deposited back during recharging when the current direction is reversed. NiCad batteries have the advantages of fast charging, good load performance, and long life, but have the disadvantages of higher cost and lower energy density than lead batteries. Common uses include calculators, electronic flash units, and cordless appliances.