BatteriesTYPES OF BATTERIESNickel-CadmiumCellThe nickel-cadmium cell is a secondary cell, and the electrolyte is potassium hydroxide. Thenegative electrode is made of nickel hydroxide, and the positive electrode is made of cadmiumhydroxide. The nominal voltage of a nickel-cadmium cell is 1.25 volts. The nickel-cadmiumbattery has the advantage of being a dry cell that is a true storage battery with a reversiblechemical reaction (i.e., it can be recharged). The nickel-cadmium battery is a rugged, dependablebattery. It gives dependable service under extreme conditions of temperature, shock, andvibration. Due to its dependability, it is ideally suited for use in portable communicationsequipment.EdisonCellIn an edison cell the positive plate consists of nickel and nickel hydrate, and the negative plateis made of iron. The electrolyte is an alkaline. Typical voltage output is 1.4 volts, and it shouldbe recharged when it reaches 1.0 volts. The edison cell has the advantage of being a lighter andmore rugged secondary cell than a lead-acid storage battery.MercuryCellMercury cells come in two types; one is a flat cell that is shaped like a button, while the otheris a cylindrical cell that looks like a regular flashlight battery. Each cell produces about1.35 volts. These cells are very rugged and have a relatively long shelf life. The mercury cellhas the advantage of maintaining a fairly constant output under varying load conditions. For thisreason, they are used in products such as electric watches, hearing aids, cameras, and testinstruments.Rev. 0 Page 15 ES-04
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