POWER SUPPLY SYSTEM AND CONTROL PROGRAM

A power supply system includes a rechargeable battery and a conversion circuit that converts power input from the rechargeable battery to a primary-side terminal pair by drive of a switching element and outputs the converted power from a secondary-side terminal pair. A positive electrode and a negative electrode of the rechargeable battery are individually connected to the primary-side terminal pair of the conversion circuit, and the rechargeable battery is connected in series to the secondary-side terminal pair of the conversion circuit. The power supply system includes a connection retaining circuit that retains the secondary-side terminal pair in a state of being connected.