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well today when i woke up i saw that the stamina icon in the status bar wasn't there. i went in settings> power saving and the stamina mode was n. i turned it off and again on and icon still wasn't in the status bar. i am running 4.2.2.
stamina mode is on all time but then it prevents all background apps from runing while in sleep mode so the battery holds longer, the there is power saving mode that will turn off most stuff like wifi, mobile data and much more after the sett % you made so if it's 30% then once it's 29% the power saving mode kicks in disabling most features.