I got my iphone 5s yesterday however I noticed that the battery drains really fast?

Any ideas of how to get it back to normal

That IS normal.

New or used iPhone? Not to update to iOS 7, reset to factory setting

My name is Hasan the most possible reason for this is due to a time application like some game
which require time like a have to wait for an hour then ill unlock the next level these applications/games are working all the time require half of your battire the second reason is your brightness if your brightness is full then it will also drain battrie when ever you use an application/game QUIT IT don't just simply press the home button

Some tips to prevent this
1-uninstall time applications/game
2-put brightness on half
3-clean your resents whenever you are about to lock your phone press the home button twice then resents will appear then clean them by sliding them upwards

BEFORE USING THESE STEPS TURN OFF YOUR PHONE AND THEN TURN IT ON THEN USE THESE TIPS

BECAUSE SOME THINGS ARE STUCK IN THE MOBILES MEMORY

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