Duracell Power Check Batteries from the 2000's with Technology Connections

[Actrogen]

In the 2000's, batteries had battery testers built into them for a spell. YouTuber Technology Connections explores what they were and how they worked. Enjoy!

 

[Actrogen]

Seems like these were mostly for AA batteries and not for anything else.

 

[Spudster]

Yeah, I don't recall those being on any other size.