try this...last time using substitute battery (even got 1 yr warranty) for S3...at first charge 2 hours ok...then subsequently charge took more than that
switched off the phone...battery still keep on draining... 2 days off and battery was empty lol
Go playstore download an app called Wakelock Detector. Check what apps are running when your screen is off. Then either change the settings of those apps or delete them.
If you're rooted, download Greenify from playstore and that will help you hibernate your apps automatically after your screen is off.
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