i have done all,
after a soft reset, its giving better performance now
also 2G/3g hogs the battery a lot... even wifi doesnt
tip, just a chklist if u missed something.
#use dark theme
#wifi off (if not using)
#bluetooth off
#Internet sharing off
#All email accounts on manual sync
#screen time out 1min
#Battery saver should turn on when battery low.
#brightness should not be automatic and be at low.
#find my phone- unchk connect easily.
#if u r using a body cover for your phone, remove it and chk battery performNce. Sometimes they cover antenna area (bottom prt of your phone) which blocks signal and consumes battery.
#do not cover antenna part while holding your phone.
#if u live in an are where signal strength fluctuates between HSPA & HSDPA (ie 3G and H shown on top of phone screen) OR HSPA & EDGE (H & E), its more prominent your battery will drain fast.
#Dont charge phone irregular. Fix a period (like in morning and evening) to charge your phone. And its always better to charge from socket directly instead via Laptop, it not only make your phone charge up faster, but increase battery life of phone and specially of your laptop.