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What Happened To Duracell PowerCheck?
(hackaday.com)
This is a most excellent place for technology news and articles.
If you watch the whole video he does it more "for real" later on, plugging the casing into a power source to simulate a battery discharging.. Plus I've had some of these PowerCheck batteries, and they were not old, it was like... 2017? So maybe they rebooted it for a short time at some point?? Anywho, if you pressed really hard it did work I think, but also I think I was doing it wrong for a long time as well lol