With iOS 16, Apple introduced battery percentage display in iPhone status bar with notch. A good idea on paper, but the realization poses problems of readability and understanding. The gauge icon is therefore always full, except when it goes to 20%.
The second beta of iOS 16.1 tries something: now the gauge displays the battery level, in addition to the percentage. The same is true in power saving mode:
Is it better in terms of visibility? Hard to say right now, but at least Apple listens to its customers! This novelty had also sparked a design contest with users, here is an anthology:
Big Brainstorm to Improve iOS 16 Battery Indicator