On 08/11/2020 13:42, 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?.


It's probably only calibrated for the former but by putting a resistive
load across the battery during the test will bring the voltage below
1.2V on a bad battery.

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