| 摘要 |
A positive electrode 2 and a negative electrode 3 are placed in a battery case 1 with a separator 4 interposed therebetween and the negative electrode 3 is smaller in height than the positive electrode 2 in the battery case 1. The positive electrode 2 contains electrolytic manganese dioxide and graphite and a potential of electrolytic manganese dioxide is in a range of 220 to 290 mV with respect to a reference electrode made of mercury oxide (Hg/HgO).
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