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Please fully discharge your device then charge to full. Then switch off and restart again to cancel all back ground apps running,please switch off all your battery apps etc. If you want have battery percentage on top bar please slide down top bar (short cuts) then touch and hold in top right corner gear (setting short cut) until start turning (around 5 seconds) then go to settings go down and click new option system UI calibration then slid battery percentage,this system is not draining your battery as other apps, and after next discharge provided this information :When you go to settings, battery click on screen you will see how many hours screen was on, WiFi, and maybe Internet,and calls time.
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