385
What Happened To Duracell PowerCheck?
(hackaday.com)
If they are not rechargeable, they don't make sense, you just use them and throw them in the used up recycle pile. And if they are rechargeable, you already have a charger that does it.
It also has to be a waste of some resource that is rare to not use up and throw away like this.
There were cheaper ones with a tester attached to the box, maybe they were energizer?
Oh, I remember that! It was inside the little packet
Just use your $200+ Fluke to check the batteries, problem solved.
My dad used to just put them on his tongue for a power check. Not entirely sure how that worked. Personally I just use a multimeter.
This is a most excellent place for technology news and articles.