Abstract: This management system manages a battery mounted on a device in a detachable manner. The battery has a battery side storage unit for storing a unique device ID of the device and a control circuit. While the control circuit supplies the power of the battery when determining that a use time authentication ID obtained from the device and the device ID are consistent with each other, the control circuit stops supplying the power of the battery when determining that the use time authentication ID and the device ID are inconsistent with each other. The management system is also provided with a management unit for storing or deleting the device ID into or from the battery side storage unit when obtaining a user ID.

Abstract: A power storage device (4) includes a power storage unit (1211) including a plurality of cells, and a BMU (1212) configured to control the power storage unit (1211). The BMU (1212) includes an upper limit power acquisition unit (23) configured to acquire, based on a SOC and a temperature of the power storage unit (1211), an upper limit power that is an upper limit of a power output from the power storage unit (1211) or a power input to the power storage unit (1211).

Abstract: A camera includes a light measuring circuit for performing measurement of a luminance of a subject, a computing circuit for performing a computation on an aperture value and/or a shutter speed by using a result of the measurement performed by the light measuring circuit, a switching device for switching the photographic mode of the camera, a locking device for locking the aperture value and/or the shutter speed computed by the computing circuit, and a controlling circuit for causing the computing circuit to compute, if the photographic mode is switched to another photographic mode by the switching device after the aperture value and/or the shutter speed has been locked by the locking device, a new aperture value and/or a new shutter speed corresponding to the aforesaid other photographic mode by using the result of the measurement performed by the light measuring circuit.