Rick,
Thanks for your response. Yes, of course, I forgot you need the open circuit or "resting" voltage for your equation. It's late and I'm tired...sorry.
We did do resting voltages before and after the load tests. One typical pattern is shown here:
Gallery :: Miscellaneous 2007 :: TG_01_LoadTest3PhaseII
where it can be seen that after being pulled down to 10.5 volts, the no-load voltage climbed after awhile to around 11.5.
The internal resistance tests were made with a Midtronics digital battery tester, supposedly the tester of choice when we started the tests about 18 months ago. After using it on about 20 different batteries, I think it's OK but not necessarily definitive. So many variables....:-)
Yes, I know about the pulsing vs. equalization thing. Our testing was to try to determine whether the little pulsing devices sold by a number of manufacturers really did anything. We worked up a testing regime which involved a series of full charges and discharges to 10.5VDC under load (all done WITHOUT the pulsers), followed by a series of cycles of pulsing for a few days, then load testing, then recharging, then pulsing for a few more days, etc. Tons of data, a few surprises, learned a lot.
You'll be interested to know that after almost six months of testing using the above methodology, we decided to equalize the T-105s ONE TIME to see what would happen. Presto...the results were much more positive than had been the pulsing/charging/discharging over the previous six months. See, e.g., this graph:
Gallery :: Miscellaneous 2007 :: First20minEqual
The red and blue curves show the difference that one equalization made to these batteries after they had been "treated" for six months.
Tired..gotta go.
Best,
Bill