Provided is a power storage unit wherein recalibration is facilitated and it is possible to supply power even when recalibration is being performed. Also provided are a method for correcting the capacity value of a storage battery, and a power storage system. Specifically, disclosed is a power storage unit provided with a control unit which connects, from among a plurality of storage batteries, at least a portion of the storage batteries to be corrected to a charge/discharge path by turning on a portion of switches among a plurality of switches, and which corrects the capacity value of the aforementioned portion of the storage batteries by charging/discharging the portion of the storage batteries while the other storage batteries are disconnected from the charge/discharge path by turning off the other switches.
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