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I was hoping someone knowledgeable would answer your question because I'm curious too.
In my experience with Roomba batteries, simply knowing the charged and rested voltage along with capacity was not enough to determine which cells were bad. I believe you also need to know what the internal resistance is for each cell, and I'm less clear on how to determine this.
It would be good to know more details, such as what hybrid pack you are dealing with, and what the symptoms are that caused you to dig into them in the first place.
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