On Sun, 8 Nov 2020 16:43:54 +0000, Chris Green wrote:

Scott wrote:
My multimeter has a battery test facility that shows the battery as
good or bad (or on the margin). I understand a zinc carbon battery
has a voltage of 1.5 Volts and an alkaline battery has a voltage of
1.2 Volts? How does it know the difference between a very good
alkaline battery and a very bad zinc carbon battery?.

Alkaline are also 1.5v when new.

It's rechargeable NiCd and NiMh that have a lower 'good' voltage,
around 1.2 to 1.3 volts.

Indeed, mea culpa.