Originally Posted by tjinguy
You say a 16A load is applies during measurement. Won't that effect different capacity packs differently and cause error?
No, as you are just measuring resistance. We chose 16A because it is not too high for the small 500mAh packs (32C but only for a short pulse) and yet it is getting towards a real flying current for medium size cells and not too small for even large cells. I suppose ideally it could be higher for really large cells, but IR is largely independant of current, although not completely.
The other limitation is that the poor little powerfet has to withstand over 400Watts during the pulse on a 6 cell pack!