Method of determining and displaying battery charge status

Details Method of determining and displaying battery charge status Method of determining and displaying battery charge status

1997-04-14

1999-10-26

Brown, Glenn W.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324427, 324433, 340636, G01R 3136, G01N 27416

Patent

active

059734973

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.

REFERENCES:
patent: 4193026 (1980-03-01), Finger et al.
patent: 4536757 (1985-08-01), Ijntema
patent: 4876513 (1989-10-01), Brilmyer et al.
patent: 4931737 (1990-06-01), Hishiki
patent: 5648717 (1997-07-01), Uskali

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