Hi,

First of all, I hope this is the right category, otherwise please move it to the corresponding one
I do not have so much experience with electronics, but I have a friend who can print pcbs based on archicad or similar soft

I am trying to substitute a smartphone battery with 4 or 5 pins with a pcb fed by 3.8V
I did something like in the below picture, but, even though it works for some phones, when I try to run all cores at 100%, the phone is "kind of throttling" them since it recognize that there is no "battery IC"

Would it be possible to create a pcb based on the battery voltage reading (across the 4-5 pins), in order to supply a constant voltage (e.g.3.8V or 4.2V) to the pcb, and connect the pcb to the phone pins using something similar to the battery circuitry in a small package (similar to the original battery)?

Regards,
Cristian

 

Would it be possible...

I'm going to say no, it's not possible without a detailed understanding of what the phones you want use are looking for on those 4 or 5 pins. The pins are there for a reason and I would fully expect a phone to act in unreliable ways if those pins are not addressed properly. I speculate that one is for a temperature probe and others may be to get at individual cells, possibly to allow charging them independently.