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That was copied incorrectly from page 221 of the original HP-12C Owner's Handbook instead of page 264 of the original HP-15C Owner's Handbook. So it's an error of an error. That whole page should be X-ed out, and replaced with the correct tests for the two CR2032 battery models.
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Note that this footnote is not an erratum if you are CAD_Jockey.
But that's because you actually have a 12C in there, and that makes almost everything else in your manual errata.