POWER SUPPLY SYSTEM AND CONTROL DEVICE

A control device classifies a plurality of batteries included in a battery string into a first battery (e.g., Ni-MH) and a second battery (e.g., LiB). When a predetermined first condition is satisfied, the control device connects, to a power supply circuit, only the first battery among the batteries included in the battery string. When a predetermined second condition is satisfied, the control device connects, to the power supply circuit, only the second battery among the batteries included in the battery string.