[NSRCA-discussion] Internal battery impedance

[Bob Richards]

The resistor does not really need to be a precision resistor, you just need to know precisely what the resistance is. :-)  And, if you are comparing or matching cells, the measurement only needs to be relative and the accuracy may not important.
   
  I do agree that the measurement will probably not be linear, IOW the cell impedance may vary with large changes in current. If I normally run 30 amps, I would want to make a measurement at 30 amps and probably 25 and 35 amps as well, comparing the differences in voltage at the three currents. This would be more meaningful to me than comparing the unloaded voltage with the voltage at 1 amp.
   
  Just M2CW.
   
  Bob R.
  

 
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