Leon wrote:

I would think that would not be difficult. In my automotive days and
when you could open the cells to add water you could put a probe down
inside each cell of a 12 volt car battery and get the voltage of each
cell. It is cumulative but when you move up a cell and the voltage
does not change the cell is dead.

Except that in those days (and even today if you know how to do it), you
could access each cell in a series scheme. Not so with a charger that has
contacts that do not wire to each cell. Methinks there is much more
smoke-mirrors-and-lights going on in groups like this than there is actual
factual information about stuff like this.
--

-Mike-