Try doing the Battery Recalibration.....make your phone completely dead
and charge it without Turning on the device .Straight till it reaches
from 0-100 (1 complete cycle) without any interruption ..make sure the
power supply is not interrupted..(or)...
I tried it but no change... today I tried the Battery Recalibration and
it works far better than how it was before ...it must be done twice but
after doing it for 1 time and I feel the battery life has increased