Charging control device and method, charging device, as well as program

A charging control method comprising the step in which a charging control device, which controls charging of a second battery, charged by a power output from a voltage conversion unit for converting a voltage of a first battery as a power source of a vehicle, and supplying power to electrical components arranged in the vehicle,

• intermittently monitors the voltage of the second battery while power supply to the electrical components other than a first load, which is constantly supplied with power of the electrical components, is stopped, the voltage conversion unit is stopped, and a first state in which the vehicle cannot travel is set;
• and
• starts up the voltage conversion unit and controls to charge the second battery with the power of the first battery through the voltage conversion unit when the voltage of the second battery becomes smaller than or equal to a predetermined threshold value while set in the first state.

A program for causing a computer, which controls charging of a second battery, charged by a power output from a voltage conversion unit for converting a voltage of a first battery as a power source of a vehicle, and supplying power to electrical components arranged in the vehicle, to execute processes including the steps of:

• intermittently monitoring the voltage of the second battery while power supply to the electrical components other than a first load, which is constantly supplied with power of the electrical components, is stopped, the voltage conversion unit is stopped, and a first state in which the vehicle cannot travel is set;
• and
• starting up the voltage conversion unit and controlling to charge the second battery with the power of the first battery through the voltage conversion unit when the voltage of the second battery becomes smaller than or equal to a predetermined threshold value while set in the first state.