Determining the "State of Charge" of Nickel-Cadmium Batteries by Farad Capacitance Measurements Page: III
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A rapid simple method has been developed for determin-
ing state of charge of the widely used nickel-cadmium
rechargeable battery. The method described is based on the
experimentally verified relationship between farad capaci-
tance and state of charge. Using this relationship, a
standard reference curve (capacitance vs. state of charge)
was established based on repeated runs of a specific battery
type. By measuring the capacitance of any battery of this
type and matching it to its standard reference curve, the
state of charge is quickly determined.
Also presented are the initial investigations of open
and closed circuit voltage measurements, impedance at one
or more frequencies, battery voltage rise time and commer-
cially available timer-chargers and coulometers; all of
which proved inadequate as a means of determining state of
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Latner, Norman. Determining the "State of Charge" of Nickel-Cadmium Batteries by Farad Capacitance Measurements, report, August 1968; [New York, New York]. (https://digital.library.unt.edu/ark:/67531/metadc172724/m1/5/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.