[Al Skierkiewicz]

Allen,
I test down to the level shown on graphs just to prove that the battery matches published performance. However, not all cells are created equal. While the overall battery may perform well when fully charged, some cells may die off before others. Every cell that runs out of steam drops the output by 2 volts. See one of my early (search) posts with graphs done on a really bad battery. One cell runs out rather early and then another and then finally a third. That test is one of the reasons I like the CBA so much. A Battery Beak or other short testing method would not show this problem. It might show up as a change in battery impedance but I don't have any real data that I can quote for that condition.