A battery-to-vehicle charging system includes: a vehicle including an on-board charger including a power factor correction circuit having a boost converter circuit, a first battery that is charged with a charge voltage output from the on-board charger, and a first controller controlling a charge process on the basis of a type of a charge power source provided from the outside; and a mobile energy storage device including a second battery storing DC charge power provided to the first battery, and a second controller providing a determination signal for the type of the charge power source to the first controller, in which when the first controller receives the determination from the second controller and the charge power source is determined as the mobile energy storage device, the first controller controls the power factor correction circuit to operate as a boost converter.