초록 ▼

A method of determining and displaying the charge status of a storage battery of a battery-operated appliance, such as a razor. A time-based charge status is calculated, based at least in part on the cumulative operating time of the appliance since recharging. The battery terminal voltage is also mo

A method of determining and displaying the charge status of a storage battery of a battery-operated appliance, such as a razor. A time-based charge status is calculated, based at least in part on the cumulative operating time of the appliance since recharging. The battery terminal voltage is also monitored. The time-based charge status is displayed until the battery voltage indicates a low voltage condition, at which point a low-charge alert indicator is displayed only if the time-based charge status is below a predetermined level (i.e., if the cumulative operating time is above a predetermined level). Methods of detecting battery aging, and for accounting for periods of excessive current flow, are included.

대표청구항 ▼

[ We claim:] [13.] A method of determining and displaying charge status of a storage battery connected to a power-consuming device through which the storage battery is discharged, the method comprisingmonitoring cumulative operating time of the power-consuming device since a latest recharge;monitori

[ We claim:] [13.] A method of determining and displaying charge status of a storage battery connected to a power-consuming device through which the storage battery is discharged, the method comprisingmonitoring cumulative operating time of the power-consuming device since a latest recharge;monitoring terminal voltage of the storage battery; and,only when cumulative operating time is above a predetermined upper limit and terminal voltage is below a predetermined lower limit, displaying a low-charge status indicator.