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There is a bug in d powersaver app that it after disabling background data wen battery is low it does not enable it automatically when d powersaver app is turnf off manually or automatically wen the battery reaches above the preset limit by charging.
Plz fix it in next update sony developer's...
Message was edited by: kenmasters
yes i have noticed this too
why are you using that app.
please dont use any battery saver apps as they drain more battery by running in background.
dont use any task killer, battery saver,, they are all battery killer... 
well you do need task killer because if you opened up alot of apps its going to hog your memory on the phone and make it slow
i removed the powersaver completely
i removed task killer as i heard it kills battery but not sure if it true