Plug [Q] Battery draining very fast

I have a problem with Samsung Galaxy S III 9300 battery,it is draining very fast,for example10min gaming---> -20%),(10min internet ---> -10/20%)...
I changed CPU governator to battery save,kill all apps,sync off,hibernate all background apps,Wi-Fi off,3G off,BT,NFC,motion off,all off...what can I do to make battery last longer?