I volt-metered a cr2032 battery and the result was like -1v. No, I am not getting the polarity of the probes mixed up. My other batteries are fine. I also measured using a better true RMS DMM, and same result. Does this result make sense?
(edit) Another question: what if I insert into an appliance upside down, to reverse the polarity. Will I have a +1v battery?
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That’s rather interesting. Didn’t realise you can overdrain a battery so it flips the voltage direction.