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My SGS3 had an extremely nice and pretty long battery life until a week ago I used a music download app to download some music. After this I get common notifications like this. And it's scary cause it's true, my battery is draining annoyingly fast. In 10 min of using 10% of battery goes bye bye. This is absurd. (i have not yet clicked on the button)

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Screenshot (click for larger variant)

After this, I checked and most of my battery goes into "android system" rather then screen or something else you would expect.

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Screenshot (click for larger variant)

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Stop running unnecessary applications in the background. For example: Bluetooth should be off when not in use and it can be turned on per usage like for example get a call then turn it on or make sure if turned on always plugged in to a charger.

Make sure you get titanium back up; you don't need pro. Go inside play store and download it. Run it and then save them to your ad card make sure it's the sd card.

Then remove any duplicate apps you don't need in your applications menu -- make sure you don't remove system files, just 3rd party apps from any Internet site or the Google playstore. Erase them and make sure you don't run them in background when Android starts or while running because Google play store app doesn't really need to be started with the phone powering on, it is a per usage application.

Make sure any app that you're not on constantly is not running. Shut them off with the task manager, you can also get an application to automate this for you with one click and schedules. (I'll have to get back to you soon on the exact app)

  • Uh-oh. A bunch of prejudices. Bluetooth doesn't eat that much (though if you rarely need it, switching it off is a good idea). Cleaning up unused apps is a good idea, too. But some apps need to be started at boot, Google Play Store is one of them (needs to register for GCM to receive update notifications). And shooting around with a task killer is the last thing you should do (see: Do I really need to install a task manager?). Task killers are for apps/processes which hang, misbehave, or otherwise do not respond. – Izzy Apr 21 '15 at 13:30
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You've caught an app which I'd consider "malware", or at least "spammy". It might run in background without being needed, and even load stuff you don't want. As you already identified that music download app being what it started with: get rid of it (I'd even bet you didn't get that app in an official market like Google Play, but found it elsewhere?). If you're lucky, that will rid you of your issue.

If you're less lucky, it has already loaded other spammy stuff. So better check your device:

  • From your home screen, press the menu button (or key)
  • Select Settings
  • Goto Apps, switch to the Downloaded tab (this excludes system apps)
  • Walk the list for anything suspicious. If you see any app you didn't explicitely install (or don't need anyway), tap its entry and chose to uninstall/delete it.

After that, to be on the safe side, let's do a little more cleanup:

  • boot into recovery mode
  • select to "wipe cache" (don't worry, this only cleans up temporary files; you'll lose no data this way)
  • select to "reboot"

Now you're back in "normal mode", and hopefully got rid of your culprit. Watch it for a while. In the worst case, that spamware has modified some settings or more, and all that's left to you is a . But first let's hope not, and above steps get your device cured.

Oh: And never believe such "battery firmware upgrade" screens. Such upgrades never come that way (downloading an application). Such a screen is a pretty clear malware/spam indicator.

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