[NSRCA-discussion] LIPO Question

[SilentAV8R]

The math is nice, but now I am confused. I have a set of old tired packs 
that consistently have IR around 1.5 milli-ohms per cell.
I have some newer cells that run around 2.5 milli-ohms per cell.
Yet the newer packs (with the higher IR) come down cooler, produce more 
power (same prop/motor/plane) and have higher voltages at the end of the 
flight.

Seems to me that there is more to this story than simply internal 
resistance.

I also wonder just how precise and accurate the chargers we have that we 
measure the cell IR with really are.

Bill



On 7/26/13 1:34 PM, Peter Vogel wrote:
> IT's actually I^2*R, not just I*R, but since the resistance is the 
> linear term here, you are basically looking at 2x the heat from Brand 
> B vs. Brand A.  The heat has to come from somewhere, and in this case 
> that's battery power that could have turned your prop and is instead 
> going to self-destruction via heat.
>
> Peter+
>