1) First of all charge your phone
2) After that go to registry editor on your phone and go to
Now again edit it and go from 20 to 80 and press OK...
RESTART YOUR PHONE AND THEN CHARGE IT!
Now you will see that the battery level has changed and shows the battery level like it should be...
Until now it seems like its working... Will leave it unti later to see if the battery will continue to show the correct level...
Try it and tell me your thoughts!
You can find the registry editor attached.
DO IT ON YOUR OWN RISK..MESSING WITH REGISTRY IS DANGEROUS! I AM NOT RESPONSIBLE FOR ANY DAMAGE CAUSED TO YOUR PHONE!
Find more registry tweaks here: