First I charged the battery to 100%, then I used this apphow did you calibrate the battery?
I know there are many apps for that, but I want to know about the experience with the same (or similar) device, as mine.
https://m.apkpure.com/ar/battery-calibration-root/com.blogspot.superthomaslab.batterycalibration
After calibration, I connected the device again to the charger and left it for 30 minutes
Sorry for my bad english