Technology

It never went away. I have a duracell battery with power check sitting next to me on my desk

Does anyone remember the battery testers that were built into the packaging? I think they were based on the same concept.

I have a really distinct memory of finding a bunch of these in a friend’s house when I was a kid and every one was empty. After watching the TC video I think it’s more likely I just wasn’t pressing hard enough and had no way to know that. Anyway, I can see why they stopped making them.

I remember those.

Would be nice to have them on my 18650s

It failed often enough that it wasn't all that useful. A cheap battery tester is better. And for 9volts you can also use the tongue test, lol (don't really though). My grandfather used to do that all the time.

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.

There were cheaper ones with a tester attached to the box, maybe they were energizer?

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.