[eq1]

I'm just about finished with my stick cycling regime... I've mostly been posting this and that question and info over at insight central, in this or that thread. But I still plan to post some 'results' here...

I've got 1 1/2 sticks to go and I'm trying to resolve a couple things before I put everything back together. One question involves measuring/calculating internal resistance. Basically, after 4 cycles on each stick I went back to the lowest capacity sticks, 5 of them, and did another cycle, with slightly different settings. And then I decided to do another cycle for all of them at these different settings.

So, when I discharged this 5th time I was more careful about documenting initial voltage and voltage under a 3.5 amp load - at 1 minute for each stick. From what I've read I can calculate the sticks' internal resistances by subtracting the loaded voltage from the initial voltage and dividing the result by the current, 3.5A. For example: 8 volts initial, 7.5 volts under 3.5A load at 1 minute, divided by 3.5, which produces 0.143...

My question is, what are the units for that 0.143? 0.143 ohms? I've looked all over and tried to figure it out, but I haven't found anything definitive. I have a Panasonic technical sheet that lists 2 milliohms as the 'internal impedance' of a single cell (12 milliohms for 6 cells I presume), but the conditions are a little different, such as a 'current' of 1000hz. I don't understand that... Overall, my sticks are ranging from 0.13 to 0.17... 12 milliohms would be 0.012 I believe, so something seems amiss in my calculations...

Thoughts?