Charging stuck at 3700mV

[tmczar]

Hello.
I'm having a blast with my keyboard - it works great and i love it. But there is only one problem. Charging.
As you probably seen, a lot of people have charging problems and i've spend some time reading through all threads, searching for my problem, but did not find it.
So before you ask - my pogo pins make contact ;)
I have 5V/3A charger, just as recommended.
My problem is that my keyboard never charges above 3700mV, while also it also barely charges phone.
Here is output of ppkb-i2c-charger-ctl info

Code:

Charger: Constant current phase ( chg_op)
Button: 00 ( btn_not_press)
0x70: 19
V=3687 mV (OCV 3698 mV) I=-2 mA

It is with charger attached. It fluctuates a bit, sometimes I is bigger than 0, sometimes not, but V never excesses 2700mV.
Meanwhile phone charge is slowly reducing. I've tested echo -n 1500000 | sudo tee /sys/class/power_supply/axp20x-
usb/input_current_limit
But it did not help.
Anybody have any idea? Is it software problem, or maybe something is wrong with my keyboard battery?
(i don't know if it changes anything, but i use user-space driver ppkb-i2c-inputd, and manjaro with plasma-mobile)

[SwordfishII]

I too have this problem. Keyboard works great, not plugged to ac it extends the phone battery life. Plugged in though I end up with a dead phone over time and have to charge them separately. Constantly putting the phone in and taking it out cant be good for the pogo pins.

[SwordfishII]

I found out that my Pi 4 powersupply actually charges both the phone and the kb battery. So you could give that a try