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So, as I say in the title, I have a GIANT battery drain proble: the battery will lose like 30-60% while idle and in airplane mode. Same but worse when listening to music (Spotify and LTE).

Yesterday night (Nov. 28-29) as it was charging (extremely) slowly ('7 hours 11 min until fully charged'), it decided to stop charging by itself and discharge fast (when obviously not using it) until 5 PM.

See attached image for details:

Screenshot
Annotated screenshot (click for larger variant)

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First of all, try uninstalling Facebook, which is using the most battery according to your statistics. You could also try to reduce your screen brightness and use a dark, static wallpaper.

Slow battery charging can indicate a faulty battery. Try to charge your battery when the device is OFF and if the battery is still charging slowly, you should think of replacing it.

  • Same problem on GS7. Started this week also 11/28. I think it charges fine but it is discharging at a ridiculous pace. 25% battery depletion in half an hour. Facebook doesn't seem to be the culprit. – Rio Rios Dec 1 '16 at 8:05
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I agree that you should try to uninstall your facebook app since we can see that it has the most battery usage. Have you ever tried to calibrate your battery? Lately, I've got a problem about a battery draining, after I calibrate it, somehow it's fixed (at least better). You can see how to calibrate your battery here. http://andronuts.com/3-easy-way-to-calibrate-smartphone-battery.html

  • There is no such thing as calibrating a battery. Android discards all knowledge of the battery profile every time it restarts. – Ethan Z Jan 5 '17 at 13:09
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There are a lot of different things that can cause this, but a "miscalibrated battery" is not one of them. Android does not store battery information through a reboot.

There are 2 apps you can download to help understand what is using battery on your phone and slow down apps' energy usage. I do not represent either of the developers, I've just used them for years with a lot of success.

  1. GSam Battery Monitor- this is a replacement for the built in battery monitor which, on my device, is about as accurate as if you asked a 3 years old how much battery my phone is using. It takes far more accurate measurements that the default monitor.
  2. Greenify- this app is an interesting type of task-killer. It uses the phone's accessibility system to force quit apps for you when they no longer need to be running, such as the insane amount of background battery drain from Facebook. Apps that are "Greenified" are shut down for you if you are rooted, or with a tap of a shortcut on the home launder if you are not. Be careful what you use this on though. Anything that you need notifications from or needs to be running in the background (like any messaging services) should not be killed.

There are some other little things you can do in the settings too. Wifi is normally a very large drain on the battery because of Google's wifi scanning for geolocation. This can be turned off in the location setting's advanced menu. In the wifi advanced settings, there is also an option to return wifi off while asleep. This saves more power than you'd think it would.

Finally, if your battery is removable, you have the advantage of being able to replace the battery at a fairly low cost.

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