{TAIL ~ two electrodes} electrically connected to a mixture of said electrolyte and said electrolyte solution, and insulated from each other, wherein one of said electrodes is made of a material selected from {HEAD ~ the group} consisting of manganese oxide , zinc oxide , and magnesium oxide , and the other of said electrodes contains graphite 
{ TAIL ~ two electrodes } electrically connected to a mixture of said electrolyte and said electrolyte solution , and insulated from each other , wherein one of said electrodes is made of a material selected from { HEAD ~ the group } consisting of manganese oxide , zinc oxide , and magnesium oxide , and the other of said electrodes contains graphite
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