How long should a Galaxy S3 battery last? My phone is brand new and today it was on standby for most of the day (it dropped 10% while being on standby for 3hrs), I only used the internet for about an hour and recieved one phone call. And my phone is almost dead! I have gps and bluetooth disabled, the screen as dim as it will go and don't have any instant notifications. I also don't have any new apps on the phone yet. My battery life says: screen 41% Adroid System 19% Adroid OS 12% Device Idle 6% Cell Standby 6% Internet 4% Maps 3% Phone 3% Messaging 2% Could I have a faulty battery?

  • Were you in an area with LTE service?
    – Compro01
    Aug 30, 2013 at 2:43
  • 1
    I've just added the battery-life tag to your question. You might want to check its tag-wiki for some basic background, info, and links. Also, its most frequented questions might prove helpful while waiting for a good answer here. If anything from those sources helped improve your situation, please don't forget to let us know here :)
    – Izzy
    Aug 30, 2013 at 6:26

1 Answer 1


I have an AT&T Galaxy SIII. I use BetterBatteryStats when I have battery issues. Lately I've been having problems with the calendar sync service keeping the phone awake. I cleared its data and resynced from scratch, and that helped, but a few hours ago I created a new calendar, and now it's going bonkers again.

Anyway, the best I've been able to get is about 3% per hour when not being actively used. I might have seen 2.5% one time, but that was a few months ago. Typically though, especially with this calendar sync problem, I see 4.5% per hour or worse.

So if your question is, "How long should the battery last?" my best answer from my experience is about 24-28 hours, considering an average 3% per hour drain while idle, and light usage. If you make a few long phone calls, that will, of course, drain it much faster.

But any apps that go haywire and cause excess wakelocks will wreck it quick. I love the freedom of Android compared to iOS, but I really want more control over apps background behavior. Android 4.3 may provide this, but who knows if the SIII will ever get it.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .