5.0 V selected by USB CC Pins (5.1 k resistors) 3.3 V step-down regulation via AMS1117-3.3 The BrodBoost-C is also open-source hardware with the KiCad schematics and PCB layout, Gerbers, and BoM ...
If you had asked me a few years ago what I considered to be the weakness of modern smartphones compared to older phones, I'd have said the battery ... using a 45W USB-C charger.