Patent ID: 6411911
Filing Date: 2002-06-25
Classification: G01R

Abstract:
A method of monitoring the status of a battery producing a voltage, comprising:a) predetermining a normalized battery voltage discharge level (Vnd) corresponding to a desired percent of battery discharge (%dd) using a universal normalized discharge curve; b) initiating a battery discharge at a start discharge time (Tstart); c) monitoring the voltage of the battery voltage measured (Vm) at a time measured (Tm) throughout the discharge; d) identifying a peak voltage (Vp) of the battery discharge; e) determining a measured normalized battery voltage (Vn) by normalizing the battery voltage measured with the peak voltage (Vp) by dividing the battery voltage measured (Vm) by the peak voltage (Vp); and f) terminating the battery discharge when the measured normalized battery voltage (Vn) reaches the predetermined normalized battery voltage discharge level (Vnd) at an end discharge time (Tend).