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A primary cell is a battery that is designed to be used once and discarded, and not recharged with electricity and reused like a secondary cell (rechargeable battery). In general, the electrochemical reaction occurring in the cell is not reversible, rendering the cell unrechargeable. As a primary cell is used, chemical reactions in the battery use up the chemicals that generate the power; when they are gone, the battery stops producing electricity and is useless. In contrast, in a secondary cell, the reaction can be reversed by running a current into the cell with a battery charger to recharge it, regenerating the chemical reactants. Primary cells are made in a range of standard sizes to power small household appliances. == Usage trend == In the twenty-first century, primary cells began losing market share to secondary cells, as relative costs for the latter declined. Flashlight power demands were reduced by the switch from incandescent bulbs to light-emitting diodes. The remaining market experienced increased competition from private- or no-label versions. In America the two leading makers, Energizer and Duracell market share declined to 37% in 2012 and along with Rayovac are trying to move consumers to more expensive, long-lasting and safer alkaline batteries from zinc-carbon.〔 Western battery manufacturers shifted production offshore and no longer make zinc-carbon batteries in the United States.〔 China became the largest battery market, with demand projected to climb faster there than anywhere else, and has also shifted to alkaline cells. In other developing countries disposable batteries must compete with cheap wind-up, solar-powered and rechargeable devices that have proliferated.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「primary cell」の詳細全文を読む スポンサード リンク
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