This perhaps could be of interest to You @AmpBenzScientist .
A mobile phone or perhaps a smartphone with a li-ion battery lasting up to 1 month.
https://blog.flipperzero.one/1-month-battery-life-with-firmware-update/
@PawelK Infinitime had the same problem with the PineTime and its Nordic chip.
A cell phone would be very different. What Mr. Lee is working on could actually get closer to it if the Pinephone had a low power screen and a larger battery. There is likely a problem with that hardware revision too. It has enough control to where it charged at 5V 3A without issue for me. Two microcontrollers control charging of the device.
Propose to pinephone kind of common interface for battery, maybe? Idk, a wild guess.
About screens, 90% of what i need, can treat it roughly as Pareto, amoleds or even nobacklight passive ones would suit me perfectly.
Do samsungs also use two microcontrols for charging?
After normalising USB-C, I would insist on somewhat normalising batteries and their connectors and general stuff around power consumption.
Emphasis: impossible to remove or replace a battery on that mobile? Trashed!
@PawelK The Pinephone battery is removable. The whole phone is held together with 6 screws that are the same size. The back of the phone pops off for battery and switch access.
They are doing great job here then, and could be viewed as a gold standard perhaps.
@PawelK The whole design is based off existing products and easily sourced smartphone parts. There are a lot of cool stories from those directly involved in the development of the phone. Cameras had to be reversed to get working with open source code and the A64 was the most powerful SoC with the Mali400. It was as open source as possible.
@AmpBenzScientist
If I remember correctly J5's batteries used to hołd charge rather nicely.