IN-VEHICLE ELECTRIC POWER STORAGE SYSTEM, VEHICLE, AND RECORDING MEDIUM IN WHICH COMPUTER PROGRAM IS RECORDED

In an in-vehicle electric power storage system including a high-capacity battery set and a high-output battery set coupled in parallel to each other, a battery control apparatus is configured to, when a voltage value of the high-capacity battery set reaches a lower-limit voltage or becomes close to the lower-limit voltage, decouple the high-capacity battery set from a circuit via a switch mechanism and continue outputting from the high-output battery set.