Battery percentage and fast charging

Hi
i am facing a truly weird problem and i searched every where on the internet for the past week before i post here
i really need help in this issue
i am cureently running Gracerom 4.1v rooted custom rom with TWRP 3.0.2.0
problem with phone is not showing correct battery percantage and fast charging "which clearly connected" but not fast as it should be
the battery percentage stops at 60-70% only no matter how long charging
i have tried every possible solution
1. rebooting
2. back to stock rom (both lollipop & marshmallow)
3. tried many custom roms
4. delete every thing
5. charging fully and discharging until zero
6. changing charger, usb cable and even battery
7. battery repair + calibration apps
i found out only one usless temporary solution
removing the new battery and reinstalling it give the the accurate percentage and charging ok until the battery became less than 60% problem restarted unless i remove the battery out again
all of this happened suddenly without any water damage or dust in the charging port when i was running stock rom before any modification
in TWRP there are no batterystats to remove
i removed the batterystats from root explorer and rebooted but no luck

please any help will be highly appriciated

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