BATTERY CALIBRATION 🔋🔋🔋
(it will not make magic but can give your 2 years old battery a half hour SoT or more. try and tell, it worked for me)
1- Download "Ampere" on Play Store
2- Open the app and charge your phone up to 100% (important: you should only proceed with the calibration when "Full" appears in Ampere)
3- Keeping your phone connected to the cable, go to your file explorer and then "/data/system" and delete "batterystats.bin ", " batterystats-checkin.bin" and "batterystats-daily.xml"
4- Reboot your phone (plugged yet) and charge it till "full" on ampere again
5- Unplug the cable and use normally your phone till its shutdown (0%)
6- Charge your phone up to 100% with it turned off
7- Turn on your phone (plugged) and charge till "full" on ampere
8- Unplug and enjoy!