Originally Posted by rijulg
That had been my first thought, but after closing all apps and not using phone even when it is turned on it drained only 1% or 2% battery in an hour, this was the case 2 days back. I don't think anything new is there on my phone since then; But still mobile data keeps on turning on itself and battery is draining even when phone is switched off. I am thinking, would a reinstall of rom be more helpful? Or uninstalling all apps one at a time?
This is not only about installing application brother.Just think.U install one widget (Can be clock widget or "animated clock")that widget will only take place in ur widget menu,as long as u not use that widget.but after u place that widget on ur home screen,everything going to change.Like ur cpu,ram and battery usage.And no matter u use ur phone or "its screen lock mode",application still contunie to drain ur battery.(Generally people put some widgets to their Home screen for gettin cool home screen but as i told u,u can find other solution,if battery issue not problem for u.Like power bank.)So coz i had same issue,with my experience all i can say to u that first,try to install all widget application which install on ur system,Second be sure,after use application clear ur ram.
About Reinstall rom...i just did this process yesterday.i mean install room.coz i made a bad mistake while i root my phone and swap my memory.Phone dont wont boot even.and i downloaded Samsung Galaxy S4 GT-I9500 firmware (Rom) and install it with odin.Everything went perfect.I success the install original room than after some steps my phone boot again.it was looking just the day i bought.There is no more root access,not any application before i install,and same widgets and applications which i seen when i bought my phone.For sure it will solve ur problem for a while but it will repeat after your install process for your old application.