Patent ID: 7279902

Claim:
A battery characteristic evaluation method of a cylindrical alkaline-manganese battery, a cylindrical manganese battery, a button-type alkaline-manganese battery, a button-type silver oxide battery, or a button-type lithium battery, which are sealed batteries, comprising: providing a bore hole on a can body of the sealed battery so as not to impair the battery characteristic of the sealed battery; through the bore hole, bringing an electrolytic solution contained in the sealed battery into contact with the electrolytic solution outside the sealed battery having the same composition and concentration with the electrolytic solution contained in the sealed battery; dipping an electrode into the electrolytic solution outside the sealed battery, and during discharge of the sealed battery under a prescribed condition, measuring a voltage between an electrode of the sealed battery provided with a bore hole and an electrode dipped into the electrolytic solution, and measuring a potential difference between an electrode material of the sealed battery on a side of the can body provided with the bore hole and the electrode dipped into the electrolytic solution.