Charging control system for in-vehicle battery

A charging control system for an in-vehicle battery, the charging control system being configured to be applied to a vehicle, the charging control system comprising:

• a main battery configured to perform a supply of electric power to a driving motor mounted on the vehicle;
• a sub battery coupled to the main battery via an electric circuit and configured to be charged by the supply of the electric power from the main battery;
• and
• a processor configured to perform a first charging control and a second charging control, wherein
• the processor is configured to:
• in the first charging control, operate the electric circuit and charge the sub battery after a predetermined time is elapsed from time when the vehicle is placed into a traveling function stopped state, the traveling function stopped state being a state of the vehicle in which a traveling function of the vehicle is stopped;
• in the second charging control, start charging of the sub battery after a time shorter than the predetermined time of the first charging control is elapsed;
• and
• perform the second charging control when the processor determines, based on time data and position data, that the vehicle is placed into the traveling function stopped state at a predetermined location set in advance and within a predetermined time zone, the position data being data on a position of the vehicle acquired by a position data acquirer.