Is the girl on the right flying? Wow! ✈️

Why?

Oh I remember those, sound quality was horribly bad.

Yeah you’re right, it guess the battery health based on prolonged usage. I’m not sure what you are looking for exists in stock Android ROM. It’s very possible that info is restricted to the system, so apps cannot access it.

Let us know if you find something, I would be very interested.

Try Accubattery, it’s pretty good for the health check of the battery.

Try renaming the folder first to see if something breaks.

Interesting read!