The apparatus of claim 1 wherein the polynomial comprises a second order polynomial.ġ0. The apparatus of claim 6 wherein the statistical function comprises median.ĩ. The apparatus of claim 6 wherein the statistical function comprises mean.Ĩ. The apparatus of claim 1 wherein battery condition is determined as a statistical function of a plurality of signal pulses and measured voltages.ħ. The apparatus of claim 1 wherein an offset voltage is subtracted from the voltage sensed by the voltage sensor.Ħ. The apparatus of claim 1 wherein the voltage sensor includes at least one sample and hold circuit to latch a measured voltage.ĥ.
The apparatus of claim 1 wherein the signal source includes a resistor.Ĥ. The apparatus of claim 1 wherein the parameter of the battery is related to battery conductance.ģ. An apparatus for testing a battery comprising: a first Kelvin connection configured to electrically couple to a positive terminal of the battery a second Kelvin connection configured to electrically couple to a negative terminal of the battery a signal source configured to apply a signal to the battery through the Kelvin connections a voltage sensor configured to measure a voltage related to a voltage across the battery and a microprocessor configured to determine a parameter of the battery based upon the signal and wherein the parameter is a function of a polynomial to compensate for non-linearities in measurements.Ģ.
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