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Factors affecting the self‐discharge rate of a nickel/metal‐hydride (Ni‐MH) battery, generally much higher than that of nickel/cadmium (Ni‐Cd) battery, are investigated, and the self‐discharge mechanism is discussed. Ammonia and amine participate in the shuttle reaction like nitrate ion in the Ni‐Cd battery, resulting in acceleration of the self‐discharge. When nonwoven fabric made of sulfonated‐polypropylene is used as a separator instead of conventional polyamide separator, the self‐discharge rate of the Ni‐MH battery is strongly depressed, to the same level as that of Ni‐Cd battery.

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