Battery stuck on 14% a long time.
What I did:
1. Download "Battery calibration" from playstore. (Developer- Nema)
2. Drained battery till 1%..
3. Charged the phone to a 100%. [Received 2 calls for approx 10 mins in total, for which I had to unplug the charger.]
4. Once battery was 100% I FIRST UNPLUGGED the charger and then clicked Battery Calibration.
The last step here is not what the app suggests in the instructions, I only realized it after I clicked Battery Calibration.
I hope this works for you too brother.