chvile googleni ukazala tohle
Using the Samsung Phone App (not the Google one)
Dial *#9900# then scroll down to battery stats reset. Click then restart your phone.
zatim to mam asi ctyri hodiny, ale ta krivka se dramaticky zmenila... vecer sem sel spat s pulkou, probudil se 12% a nez sem na telefonu otevrel chrome ze to pogooglim tak to bylo 1%...