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Nickel cadmium batteries are widely regarded as the most reliable industrial stationary battery available today even when exposed to extremes of environment and abusive charge regimes. Nevertheless some users of nickel cadmium batteries experience disappointment when carrying out capacity tests in accordance with IEEEII06 recommendations. This paper describes the effect of utilizing discharge data generated by IEC methodology in capacity testing from constant potential charge conditions. The paper also discusses the importance of referring to the initial application engineering of the battery for capacity testing over life and a possible error in IEEEI106 pass / fail criteria.