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Started by: priscus (inactive)
It threw me when I first encountered it.
Took an AA alkaline battery, and put leads from digital multimeter to its terminals.
Nominally a 1.5 Volt battery, but is not new.
So, I was expecting to see reading of maybe 1.2V if the cell was OK,
and perhaps something circa 700 milliVolt if cell had expired.
What I read was MINUS 150 millivolts.
And a similar negative reading for the other cell!
Turning them round the wrong way yielded similar readings in positive territory, so at first, I thought perhaps my meter's 'polarity reverse' function was misoperating. Not so: new batteries tested OK, and tried another meter, which yielded similar results!
Replied: 7th Dec 2019 at 02:46