A battery capacity calculation device (43) and a battery capacity calculation method to calculate a full charge capacity at a high frequency.The battery capacity calculation device (43) includes a controller (44). The controller (44) is configured to acqui...

The present application is to finish charging more accurately in the fully charged state even when electric power is consumed in a system. A power supply circuit supplies, to the system, system power required for the system out of DC power supplied from a ...