MARS - The Eveready Battery Company offers a complete line of alkaline, general purpose and lantern batteries. These high quality batteries are made in the USA and are competitively priced. The Eveready Energizer Industrial Alkaline batteries are environmentally safe. The new black and green shell signifies the "ZMA" (zero mercury added) formulation. This provides a better discharge rate, lower impedance and better low temperature performance than carbon zinc. These ZMA alkaline batteries are also less sensitive to changes in the discharge rate or duty cycle.