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I was only doing Facebook with 100% charge! After 20 minutes I noticed that the charge is below 80%!
Just followed these steps & surprised! 30 minutes with browsing Facebook+YouTube only 7% charge consumed! It's worked like magic!

Step 1: Ensure the device is 'Power off'.
Step 2: Simultaneously press and hold the 'Power Button + Volume Up' button together until recovery booting appears in the screen.
Step 3: From the Android system recovery screen, select 'Wipe Cache Partition'. Then Select 'Yes'.
After that select 'Reboot System Now'.
(Don’t worry your data+settings will be safe)
Step 4: After device restrat type *#0228# & Celibate the Battery.

Enjoy ☺