AND, BATTERIES, BATTERY, CADMIUM, CD, CHARGER, CHARGING, EFFECT, ELECTRICAL, ELECTRICITY, ELECTRONICS, ELEMENT, ELEMENTS, ENERGY, ENVIRONMENTALLY, FRIENDLY, MEMORY, METAL, NI-CAD, NICAD, NICD, NICKEL, NICKEL-CADMIUM, PHYSICS, POWER, RECHARGEABLE, RICHARD, TECHNOLOGICAL, TECHNOLOGY, TOXIC, TREPTOW,