S7 Edge Bad Standby Battery Life - Why am I losing 25% over night?

[AC Question]

My phone was at 100% and I left it overnight face down and when I woke up 8 hours later it was at 75%. I don't understand because under the battery usage it has Cell Standby, Android System, Phone Idle, and Android OS as the users. When I add up the mAH it only adds up to about 173 mAH which is only roughly 5% because the S7 Edge has a 3600 mAH battery. I have the North American one with a Snapdragon. Help would be appreciated!

 

[Golfdriver97]

Welcome to the forums. Can you provide a screenshot? Have you tried restarting the device?

 

[PatentPower]

I made an account, I was the one who posted the question. Yeah I've restarted my phone multiple times.
Imgur: The most awesome images on the Internet
That's the image you asked for!

 

[Mr_Spencer]

Apparently there was a server end issue with Facebook yesterday that has been resolved as of this morning. But that only answers your question if u have the application and if it was just last night that u experienced the problem.

 

[Golfdriver97]

Perhaps a cache wipe in recovery?

 

[PatentPower]

I don't have the Facebook app, and I have already wiped the cache a few times, what do you mean wipe it in recovery mode? Wipe it in Safe mode you mean? Also, I forgot to mention, I do have a Gear S2 that is always linked to my phone with Bluetooth but I unlinked the watch and tested it also and the phone still lost 25% overnight.

 

[B. Diddy]

Welcome to Android Central! Wiping the system cache partition requires that you boot into Recovery Mode: https://support.t-mobile.com/docs/DOC-28028. If you weren't doing that, then you were only wiping the app caches, which isn't the same thing.

Cell Standby usually suggests that you have bad signal. How is the signal where you keep the phone overnight?

It'd be helpful to see more stats. Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:

1. The main Settings>Battery screen.
2. The fullscreen battery graph screen (which shows Awake time and Cell Signal Strength).
3. The Screen category (to see total Screen On time).
4. The Cell Standby category, if present (to see Time Without Signal).


http://forums.androidcentral.com/ge...ide-how-post-screenshots-android-central.html


You might have to install a 3rd party battery monitor, like GSam Battery Monitor, to get the Cell Signal Strength graph.

 

[PatentPower]

The signal overnight generally hovers around 4 to 5 bars of LTE. And ok, I can use the phone tomorrow and drain it to 20% and then send screenshots. Although my graph doesn't expand and so it doesn't plot cell phone strength.

 

[B. Diddy]

I know -- that's a Samsung limitation, for unclear reasons. That's why I suggested installing GSam Battery Monitor to get that info.

 

[PatentPower]

Yeah I just installed it. Would you also happen to know why my phone's mAH only added up to 173 used last night but when I woke up it actually lost 25%?

 

[B. Diddy]

Sorry, I can't explain that. It's possible that the stats don't account for various other smaller battery-using components, that when added up may still be significant.

 

[PatentPower]

Alright! I will test it again tonight by leaving it out and then tomorrow I will use it normally and send screenshots once it hits around 30%!

 

[PatentPower]

Also, for whatever reason my phone doesn't seem to ever doze... GSAM also shows no doze...

 

[PatentPower]

Alright so I tested it today and for some reason my phone uses way less battery when wifi is off but something like clearing the cache in recovery mode might have also fixed it, not sure. The phone went from 92% to 50% in 13 hours with about an hour of screen on time and I also listened to music for an hour or so with earbuds and the signal was only really bad for about an hour. Is that normal??

 

[B. Diddy]

That sounds reasonable. Wi-fi can sometimes suck battery if you have the Improve Accuracy setting turned on for wi-fi. Go to Settings>Privacy>Location>Improve Accuracy​, and make sure Wi-fi Scanning is turned off.

 

[PatentPower]

Ok, I'll test it again tonight with wifi on!

 

[PatentPower]

So Android OS is using a lot of battery, almost 30%. Is that normal? It's using about 500 mAH.

 

[B. Diddy]

It can be normal. What's the overall battery life like?

 

[PatentPower]

Well with 2 hours of screen on time and after its been off the charger for about 13 hours it goes from 100% to 40% while it's in power saving mode with wifi off.

 

[B. Diddy]

You mentioned wi-fi being off -- but is Wi-fi Scanning also off? If Wi-fi Scanning is on, that can still turn on your wi-fi, even if you've turned it off.