Power system having a battery unit that calculates cumulative work volume value

Abstract

A camera includes: a battery unit on which a battery is mounted, that can be detachably loaded into the camera and supplies power to the camera; and a function unit that executes camera functions, wherein: as a function of the camera is executed, the function unit transmits information related to the executed function to the battery pack; and the battery unit has a storage unit in which the information related to the camera function is stored.

1 . A power system comprising:
 a battery unit that includes a battery; and   an apparatus main body that operates on power supplied from the battery in the battery unit mounted thereat, the battery unit and the apparatus main body being engaged in information exchange, wherein:   a work volume value, defined by an amount of an operation having been executed in the apparatus main body, is transmitted from the apparatus main body to the battery unit over a predetermined cycle;   the battery unit calculates a cumulative work volume value of the work volume value at the apparatus main body and stores the cumulative work volume value therein, and the battery unit also detects a consumed battery capacity value indicating an extent to which a battery power has been consumed at the apparatus main body;   the cumulative work volume value, the consumed battery capacity value and a charged battery capacity value are transmitted from the battery unit to the apparatus main body over the predetermined cycle; and   the apparatus main body displays a battery use rate indicating an extent to which the battery has been used based upon the consumed battery capacity value and the charged battery capacity value, and also displays the cumulative work volume value at the apparatus main body.