CONTROL DEVICE AND CONTROL METHOD FOR POWER UNIT

A control device for a power unit connected to a motor that starts an internal combustion engine, the power unit having a plurality of batteries connected in parallel with each other and which are configured to supply electrical power from the plurality of batteries to an electrical load other than the motor, wherein the control device comprises a detection unit that detects a residual mount of electrical power of each of the plurality of batteries, a comparison unit that compares the residual amount of electrical power of the plurality of batteries, and a starting control unit which, at a time when the internal combustion engine is started, controls the power unit, and thereby starts supplying the electrical power from the plurality of batteries to the motor in a descending order of the residual amount of electrical power of the batteries being larger.