Provided is a valve-regulated lead-acid storage battery operated in a partial state of charge and having excellent cycle characteristics. Carbon black and graphite are added to a negative electrode active material for a negative electrode plate forming the valve-regulated lead-acid storage battery. A graphite having an average particle size of no more than 90 µm and having a DBP absorption of at least 55 ml/100 g is used as the graphite added to the negative electrode active material.
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