Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-09-12
1988-05-10
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 14, 320 38, 340636, H02J 700, G08B 2100
Patent
active
047438312
ABSTRACT:
The remaining battery life of a battery powered device is predicted by monitoring the immediate past history of battery life and employing this immediate past history as a basis for subsequent predictions of the useful life of the battery. By this approach, the present invention is able to take into account the deterioration of battery life which occurs during the life-time of a rechargeable battery. The device includes a data storage means for storing a predetermined value representing the total number of usable hours to be expected to obtain from a fully charged battery during normal use, means for counting the number of hours of actual use of the battery, and means operable in response to the occurrence of a full discharge of the battery in normal use for updating the data storage means to store therein as the predetermined value for the expected useful life of the battery in the next cycle of normal use, the value for the number of hours of use actually obtained from the battery in the current cycle, so that subsequent predictions of the battery life will be based upon the immediate past history of actual battery life.
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Hickey R. J.
Troxler Electronic Laboratories, Inc.
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