A battery electrode plate is made by loading a supporting porous metallic plaque with active battery material made by: (1) hydrolyzing the reaction product of a fuse-melted starting material comprising an admixture of nickel oxide, sodium peroxide and an amount of an oxide containing, alkali metal, non-reactive flux material effective to allow a melt-fusion reaction of the starting material at temperatures of between about 650 C to about 925 C, the hydrolyzed solid reaction product containing electrochemically active nickel hydrated oxides and hydroxide forms, (2) if desirable, drying the product below about 65. degree. C, and (3) preferably adding, at some step in the method, an amount of cobalt containing additive effective to provide about 2 wt.% to about 10 wt.% cobalt in the active battery material based on nickel oxide plus cobalt content.
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