Hi I keep hearing people complaining about their battery draining, but I found turning off and on some features does infact stop the battery from draining too much, but this only works with the latest 4.4.2 update because I noticed that Power saving mode was not working on 4.3. You should set your setting like this:
The final step is to set you screen brightness to 25% (Brightness level by Curvefish) and turn off your wifi.
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