Then I think we both agree that Udo should measure time to an end
voltage, rather than voltage after a fixed time, no matter what the
load device is.

I used to use a computer A/D input to record and plot battery discharge
voltage and current. I gathered lots of data. All I found was that in
flight battery failure was usually caused by failure of one cell and
that could not be predicted, only confirmed after the event, from the
discharge plots.

Andy