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A nickel-metal hydride storage battery having a high capacity and excellent cycle life is disclosed. The battery employs, as its material for the negative electrode, a hydrogen storage alloy powder having a composition represented by the general formula Zr1-xM3xMnaMobCrcM1dM2eNif, where M1 represents at least one element selected from the group consisting of V, Nb and rare earth elements, M2 represents at least one element selected from the group consisting of Fe, Co and Cu, and M3 represents at least one element selected from the group consisting of Ti and Hf, and where 0