For the cylindrical battery construction, the negative and positive electrodes were spirally wound together with a sulfonated polypropylene separator and the bundle was then inserted into a cylindrical case. The negative alloy (MmNi3.7Co0.8- Mn0.4Al0.3) was used as the reference for comparison. The composition is a typical one for consumer devices emphasizing the cycle-life as well as the capacity and power. The negative electrode capacity is 4 times that of the positive one (N/P = 4). The battery capacities were 400–800 mA h. After the electrolyte (5.6 mol/LKOH with1.2 mol/L-LiOH) was added, the battery was sealed