Patent ID: 8241780

Claim:
An alkaline battery comprising a positive electrode and a negative electrode placed in a battery case with a separator interposed therebetween, wherein the negative electrode is smaller in height than the positive electrode in the battery case, the positive electrode contains electrolytic manganese dioxide as a principal positive electrode active material, and graphite, 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) in a 40% KOH solution, and the ratio of the negative electrode height to the positive electrode height in the battery case is in a range of 0.85 to 0.975, a weight ratio between the electrolytic manganese dioxide and the graphite is in a range of 90:10 to 94:6, and the negative electrode contains zinc powder and the content of zinc powder having a particle diameter of 75 μm or less is in a range of 21 to 40%.