The battery assembly system 100 includes a battery assembly including a plurality of storage batteries C1 to Cn connected in series, a voltage detector 3 for detecting respectively voltages generated in the storage batteries, a current detector 4 for detecting a current flowing in the plurality of storage batteries, a state-of-charge (SOC) calculator 2 for calculating the state of charge (SOC) of the storage batteries, respectively, based on the voltages detected respectively by the voltage detectors 3 and the current detected by the current detector 4, and a charging/discharging unit 1 for charging or discharging at least one of the plurality of storage batteries so as to equalize the SOC of the storage batteries calculated respectively by the SOC calculator 2.

 
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