Method of determining and displaying battery charge status
First Claim
1. 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 to a predetermined residual charge, the method comprisingcalculating a time-based charge status corresponding to cumulative operating time of the power-consuming device,comparing terminal voltage of the storage battery to a predetermined lower voltage threshold value, anddisplaying a predetermined low charge alert indicator on a display only when both the time-based charge status is at or below a predetermined lower limit and the terminal voltage is below the lower voltage threshold value.
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Accused Products
Abstract
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.
87 Citations
14 Claims
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1. 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 to a predetermined residual charge, the method comprising
calculating a time-based charge status corresponding to cumulative operating time of the power-consuming device, comparing terminal voltage of the storage battery to a predetermined lower voltage threshold value, and displaying a predetermined low charge alert indicator on a display only when both the time-based charge status is at or below a predetermined lower limit and the terminal voltage is below the lower voltage threshold value.
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11. 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 comprising
calculating a time-based charge status based at least in part on cumulative operating time of the power-consuming device since a latest recharge; -
comparing terminal voltage of the storage battery to a predetermined lower voltage threshold value; displaying via a charge status indicator the calculated time-based charge status until the time-based charge status is at or below a predetermined lower limit and the terminal voltage is below the predetermined lower voltage threshold value; and
,only when both the time-based charge status is at or below the predetermined lower limit and the terminal voltage is below the predetermined lower voltage threshold value, displaying a low-charge status indicator. - View Dependent Claims (12)
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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 comprising
monitoring 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. - View Dependent Claims (14)
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Specification