Dr. Prius acceleration test

Yesterday the Dr. Prius tests were run on our 2007. It came out as 50% capacity, no error codes, and in generally good health. The modules were all pretty close in voltage and the IRs were within 0.1 of each other. (Those values wander around a lot but that description always held.) Not bad for a 14 or 15 year old pack. However, running the acceleration test gave some problems. The first time it said that module 5 was out of balance in the Low Voltage test. Ran it again, it said that 3 other modules were out of balance in the Low Voltage test. Ran it a third time, and all the modules were fine, but it said the battery was too hot. (Not surprising since it had just done 3 hard accelerations and stops with only a few seconds between them.) I think the fan is still working OK, but cannot test it at the moment since my techstream PC broke (literally, at the hinges) and I have not had a chance to replace it yet.

So what does the Low Voltage test measure in that acceleration test, and why would different modules be out of balance in different runs?

 

Gas and other petroleum products are only (relatively) cheap at the moment because the costs of their externalities are not included in the sale price. Without going into the politics of what fixing that would entail, the current situation is like saying "why pay to install a septic tank when our house's sewage can continue to run through the existing outlet pipe which empties into my neighbor's back yard"? The main difference is that in this analogy it is immediately apparent who is causing all the damage, whereas with carbon emissions it is not so cut and dried. So not "Bob dried up the Mississippi last month" or "Bob caused a drought in central America", but rather "Bob's emissions contributed one billionth to the problem (and so did a billion other people out of the >7 billion people on the planet)".