A storage battery includes an electricity storage unit (10) including a first battery cell group in which a plurality of first battery cells (10-1, and the like) are connected in series, an auxiliary electricity storage unit (11) including a second battery cell group in which a plurality of second battery cells (11-1, and the like) capable of performing higher-speed charging and discharging in comparison to the first battery cells (10-1, and the like) are connected in series, a voltage adjustment unit (14) that performs voltage adjustment during power delivery between the electricity storage unit (10) and the auxiliary electricity storage unit (11), a first switching unit (12) which is capable of individually connecting the plurality of first battery cells (10-1, and the like) to the voltage adjustment unit (14), and which is capable of connecting the first battery cells to the voltage adjustment unit (14) in an individual combination unit of two or more of the first battery cells (10-1, and the like), and a second switching unit (13) which is capable of individually connecting the plurality of second battery cells (11-1, and the like) to the voltage adjustment unit (14) and which is capable of connecting the second battery cells (11-1, and the like) to the voltage adjustment unit (14) in an individual combination unit of two or more of the second battery cells (11-1).