[NSRCA-discussion] Internal battery impedance

[Ron Van Putte]

The LiPo Doc is not intended to be a precision cell internal  
resistance tool.  Its intent is to point out bad cell(s).

Ron Van Putte

On Mar 16, 2008, at 6:54 PM, Bob Richards wrote:

> 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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