Method and apparatus for assessing available battery life in a r

Details Method and apparatus for assessing available battery life in a r Method and apparatus for assessing available battery life in a r

1996-02-01

1998-05-12

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 340661, 324426, 324429, 324430, G08B 2100

Patent

active

057512175

ABSTRACT:
Available battery life of a rechargeable battery is assessed and indicated to a user (300). A temporary load is switched onto a fully charged battery (304, 308) and voltage measurements are taken in both unloaded and loaded conditions (306, 310). The battery's internal impedance is determined (312) based on the measured voltages and is compared to a predetermined threshold (314). The predetermined threshold is set based on a value representing a selected minimum available capacity of the battery. An indicator alerts the user as to the status (316, 318) of the available battery life of the battery.

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