05596260 is referenced by 240 patents and cites 9 patents.

In an electronic device powered by a battery, a method of determining a charge of the battery. Initially, a discharge curve specifying the battery's voltage as a function of time is determined. This discharge curve is calibrated according to actual measurements. Next, a battery state model is established. The battery state model is comprised of a number of discrete charge states. The probability of the actual battery's charge for a particular charge state is specified by the battery state model for each of the charge states. The battery's voltage is periodically measured. Based on the measured voltage and the discharge curve, a voltage probability distribution is computed. The battery discharge model is updated by applying Bayes theorem to the old discharge model and the voltage probability distribution. The charge of the battery based on a mean value of the battery discharge model is then displayed.

Title
Apparatus and method for determining a charge of a battery
Application Number
8/242541
Publication Number
5596260
Application Date
May 13, 1994
Publication Date
January 21, 1997
Inventor
J Rhoads Hollowell II
Sunnyvale
CA, US
Kevin J Dowling
Pittsburgh
PA, US
Michael K Blackwell
Pittsburgh
PA, US
James R Beninghaus
Cupertino
CA, US
Hans P Moravec
Pittsburgh
PA, US
Agent
Blakely Sokoloff Taylor & Zafman
Assignee
Apple Computer
CA, US
IPC
H01M 10/48
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