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SGH-I337M Never In Deep Sleep Mode

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iKeos
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Default SGH-I337M Never In Deep Sleep Mode

Hello XDA members! I have recently bought a used Samsung Galaxy S4 SGH-I337M Telus/Koodo a few days ago on a website similar to Craigslist but better (Kijiji). I got it unlocked and updated it Android 4.3 not rooted.
Anyways, my phone battery is really bad. Yesterday night, the battery was at 47% when I went to sleep. No apps were running except my SMS app and WakeLock Detector. The wifi was turned off, the Power Saving Mode was on and the brightness was set to its lowest. This morrning when I woke up, the phone was at 19%, so it lost 28% in about 8.5 hours while in standby mode. I tried the app Deep Sleep Battery Saver but it doesn't seem to work very well. When I check WakeLock Detector stats, the Deep Sleep time is always at 0.0 seconds; therefore, my phone has NEVER entered in Deep Sleep mode Help please?
 
iKeos
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Somoeone help pleaseeeee?
 
AoEKiller
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(Last edited by AoEKiller; 17th March 2014 at 10:02 AM.)
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Did you read the app description? If you turn off WiFI and enable Power Saving mode, it block WIFI and Mobile DATA then the app cannot put your device in deepsleep.

Description:
During deep sleep mode, Wifi, 3G are turned off, background apps are stopped. Therefore, most apps are not working, including Facebook, Google Service, etc,. It then constantly wakes up in order to download email, sync Facebook status, etc,.

I can't really help you for the batt drain unless you could root your device to get more information from CPU: twist Process setting or buy another app on the playstore to monitor your battery drain like BetterBatteryStats.
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