Electronic equipment having display device for displaying lifetime of power source

Claim 1

An electronic equipment using a battery as an energizing power source, comprising: a display unit; signal generating means for generating operation clocks while the electronic equipment is being actuated; counting means for measuring the number of the clocks; calculating means for calculating an operating time of the battery based upon the result of the counting operation by the counting means; timer means for measuring the total actual time for which the battery has been held in said equipment; means responsive to said timer means and said calculating means for determining the total off time in which said electronic equipment is unactuated; estimating means responsive to said calculating means and said means for determining for estimating a consumption state of the battery based upon the result of the calculation by the calculating means and the determination of off time; and informing means responsive to said estimating means for causing said display unit to display beforehand the expiration of the lifetime of the battery based upon the result of the estimation by the estimating means wherein said estimating means estimates a consumption state of the battery based upon current outputted from the battery while said electronic equipment is actuated and unactuated.