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What Happened To Duracell PowerCheck?
(hackaday.com)
This is a most excellent place for technology news and articles.
Although, he admits in the video to "faking" his footage of it working, by using a off-camera heat source. (His batteries were quite dead.)
But, as someone that lived through this time, they did work, as long as you pressed hard enough in the right places. It was hard to tell if the battery was dead or if you weren't pressing hard enough
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
Yeah I used them. It was somewhat handy.