On: Google Pixel Fold

[j45]

I’m pretty sure you should be able to find data. Only a handful of battery manufacturers used.

Phones typically are geared to use the full capacity of the battery.

The demand towards the thinnest phones possible leaves smaller tolerances towards cramming in the biggest battery possible.

I think the galaxy note 4 was the last one with a removable battery therefore something that could run a long time.

An external battery case depending on how you use it can extend the lifespan of an internal battery too.