Develop Bugs

Serious battery drain for the past few Weeks!

Can someone help and tell me if anything looks wrong in one of these pics? My phone sometimes sleeps and sometimes it don't. Just woke up from a nap to this. Phone was fully charged while I slept smh
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What ROM are you using? Your wake seems unreal, like it never sleeps.
.: Swyped from my Samsung Galaxy S II™ Epic™ 4G Touch ლ(ಠ益ಠ)ლ :.

1. Turn off Auto Brightness - Menu>Settings>Display>Brightness
2. Lower Brightness - Menu>Settings>Display>Brightness
3. Turn down screen - Menu>Settings>Display>Screen Timeout
4. Drain your battery until it turns off automatically.
5. Keep it off, charge phone to 100%.
6. Repeat steps 4 and 5 two times.
Use device like this for 48 hours, then post back your results...
Tips:
Keep WiFi, 3G, & 4G off when not in use.
Press the power button to turn off your screen when not in use, (don't hold...)

hayabusa1300cc said:
What ROM are you using? Your wake seems unreal, like it never sleeps.
.: Swyped from my Samsung Galaxy S II™ Epic™ 4G Touch ლ(ಠ益ಠ)ლ :.
Click to expand...
Click to collapse
I'm running stock rom. It just started doing this recently. About the time I started moving apps to the sd card. That's the only thing I could think of. I know when I put too many apps on sd card my phone will go into a continuous boot loop. I'm going to move everything back to the phone and see what happens
Sent from my SPH-D710 using XDA App

Try that, and my mini guide..... something is elevating your display usage.....

deedscreen said:
1. Turn off Auto Brightness - Menu>Settings>Display>Brightness
2. Lower Brightness - Menu>Settings>Display>Brightness
3. Turn down screen - Menu>Settings>Display>Screen Timeout
4. Drain your battery until it turns off automatically.
5. Keep it off, charge phone to 100%.
6. Repeat steps 4 and 5 two times.
Use device like this for 48 hours, then post back your results...
Tips:
Keep WiFi, 3G, & 4G off when not in use.
Press the power button to turn off your screen when not in use, (don't hold...)
Click to expand...
Click to collapse
1-3 are pretty much all set. I don't use auto brightness. 4-6 I've done before but I will do it again. And I keep radios off when not in use so that can't be it either. My phone used to have good battery life with the settings I normally use so I don't know what's causing this all of a sudden..
Sent from my SPH-D710 using XDA App

deedscreen said:
Try that, and my mini guide..... something is elevating your display usage.....
Click to expand...
Click to collapse
The thing that bugs me is that display time is so high in % and it only was on for 22 mins. Then I took a nap and it stood at the top. Usually my Android OS takes the top spot when phone is not in use. This is mad weird! But i'm trying both things now..
Sent from my SPH-D710 using XDA App

What is media server? I don't think that used to pop up b4 and its always on my battery stat as of recently.
Sent from my SPH-D710 using XDA App

has to do with WiFi, as connecting to the Network for music, and Kies, (I believe)

I don't have wifi at home anymore so I keep wifi off. Hmm.. Can it be from running the Sprint hotspot? I used it last night and haven't rebooted phone since using it. I use it almost every day..
Sent from my SPH-D710 using XDA AppI

RayTrue04 said:
I don't have wifi at home anymore so I keep wifi off. Hmm.. Can it be from running the Sprint hotspot? I used it last night and haven't rebooted phone since using it. I use it almost every day..
Sent from my SPH-D710 using XDA AppI
Click to expand...
Click to collapse
possibly.... I'm not quite sure, to be quite honest...

Your phone was awake the entire time while your screen was not. That means you have a serious wakelock issue. To find out what is causing it, download betterbatterystats, and that will tell you what program/process is causing such a long partial wakelock. Seriously helped my battery issues big time. Link below for more info:
http://forum.xda-developers.com/showthread.php?t=1179809

I'm getting bad battery drain too!!
Sent from my SPH-D710 using XDA App

'Keep WiFi, 3G, & 4G off when not in use.'
How do you turn off 3g?

pbassjunk said:
'Keep WiFi, 3G, & 4G off when not in use.'
How do you turn off 3g?
Click to expand...
Click to collapse
you go to settings>Wireless and Network>Mobile Networks then uncheck "3g Data"

Text Plus drains a lot of battery..
I used it for a while.

beezar said:
Your phone was awake the entire time while your screen was not. That means you have a serious wakelock issue. To find out what is causing it, download betterbatterystats, and that will tell you what program/process is causing such a long partial wakelock. Seriously helped my battery issues big time. Link below for more info:
http://forum.xda-developers.com/showthread.php?t=1179809
Click to expand...
Click to collapse
So far I just rebooted my phone and now its sleeping again when screen is off. Idk maybe I should reboot my phone after every hotspot use.. Def gonna try out that better battery stat. Thanks for the link!
Sent from my SPH-D710 using XDA

Better Battery Stats **Results** Anything stick out?

Hi all,
I'm wondering if someone with eyes better than mine could peep my post:
http://forum.xda-developers.com/showpost.php?p=34855908&postcount=4990
I'm getting horrible battery life on ktoonz kernel with mw86 settings.
I've got screenshots of better battery stats as well as ktoonz custom settings.
I've already adjusted my down threshold to 75.
Thanks,
RR

h20wakebum said:
Hi all,
I'm wondering if someone with eyes better than mine could peep my post:
http://forum.xda-developers.com/showpost.php?p=34855908&postcount=4990
I'm getting horrible battery life on ktoonz kernel with mw86 settings.
I've got screenshots of better battery stats as well as ktoonz custom settings.
I've already adjusted my down threshold to 75.
Thanks,
RR
Click to expand...
Click to collapse
Are you having battery drain problems? It appears your phone is awake more than it is in deep sleep. Have you tried the good ol' battery details screen in settings to see what your top usage is?

freeza said:
Are you having battery drain problems? It appears your phone is awake more than it is in deep sleep. Have you tried the good ol' battery details screen in settings to see what your top usage is?
Click to expand...
Click to collapse
I've attached the screenshots as requested.
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Oh... and this is only 1 hour of screen on time...
I guess my cell signal kinda BLOWS??? could this be the culprit?

Your signal search seems to suck, may be one issue. Another thing to try is go to system/bin and delete at add .bak to qosmgr and gsiff_daemon. They tend to try and run scripts for your CPU that don't apply. Next, do a Google search for kill media server apk. When you run it, it kills the media server that tends to eat a lot of battery. Disable sync on Google magazine/book/movies also. Last, buy gsm battery monitor from the play store and also battery battery stats. They will identify what's eating or power supply. Almost always on power up you can see the download/media app runs like crazy and if you don't force stop will just continue to drain and run.
You may also want to check into different governor settings to see if it will help. I also found it helpful to turn off Facebook sync unless i use the app....do the same for others u don't use like Google talk, maps, etc.
,
Sent from my SPH-L710 using xda app-developers app

h20wakebum said:
I've attached the screenshots as requested.
View attachment 1525777
View attachment 1525778
Oh... and this is only 1 hour of screen on time...
I guess my cell signal kinda BLOWS??? could this be the culprit?
Click to expand...
Click to collapse
You seem to have a wakelock issue. Did you turn off google now and disable report location in Maps?
Also, if your signal is the problem, you can test that by either 1) disabling the cellular radio (airplane mode + wifi on), or 2) by forcing roaming on another network with a better signal (roam control, internal roaming settings of the rom, using a different prl etc.)

Couple things to help for sure.... GTalk is auto sign in.. So make sure it's signed out, Sync settings, Extend duration between them! (Emails to few hours instead of push (Obviously it'll sync when you open the app), Try running Juice defender, It'll disable data if screen off. (SMS comes through) Brightness, turn it down some, I'm running the Ktoonservative with the kernel.. Netting atleast 2 hours screen on, 11+ hours battery and still sitting about 60% remaining (most days) Those are the settings i'm using and things i'm doing. (I play games off and on, Text, read forums, news, facebook) also, ensure Media isn't running. (Not media server) it's known to eat some battery randomly. Just a few things off the top of my head to help.

one cardinal no no is leaving the wifi on.
Sent from my Transformer Pad TF300T using Tapatalk 2

freecharlesmanson said:
one cardinal no no is leaving the wifi on.
Sent from my Transformer Pad TF300T using Tapatalk 2
Click to expand...
Click to collapse
???
???

It will greatly increase your wake locks if not inhibit sleep all together
Sent from my SPH-L710 using Tapatalk 2

Go to Maps>Settings>Location settings> Uncheck everything !!

freecharlesmanson said:
It will greatly increase your wake locks if not inhibit sleep all together
Sent from my SPH-L710 using Tapatalk 2
Click to expand...
Click to collapse
Wifi or cellular, it doesn't matter as far as wakelocks are concerned.
Cellular data consumes more battery than wifi data.
Unless you disable data all together, using wifi is more efficient way to run your phone.

nabbed said:
Wifi or cellular, it doesn't matter as far as wakelocks are concerned.
Cellular data consumes more battery than wifi data.
Unless you disable data all together, using wifi is more efficient way to run your phone.
Click to expand...
Click to collapse
On you are not grasping my simple statement I never said WiFi want more efficient but it would be foolish to pretend it doesn't wake lock and kernel alarm it up. For one wpa pretty much requires it to communicate every so often. Other reason.... couldn't tell you why precisely but of you look then you will notice it does in fact create huge wake periods
Sent from my SPH-L710 using Tapatalk 2

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I would suggest killing your mobile data, or for a more extreme test running in airplane mode with wifi on.
I personally get 20-30 hours at home browsing the web / texting / googling / etc over the weekend, maybe 18-20 when im out and about. But at work i get MAYBE 6 hours, with under 30 minutes scrren on and usually less and an hour awake. Why the huge difference? Mobile signal strength at home i keep mobile data off, and wifi on, and have ~ -75dbm signal strength. At work i have no wifi and ~ -110dbm and my phone is constantly trying to get a better signal.
Looking at your original post, what is "audioOut_2" and " PowerManagerService"

Question, is media server something that can be frozen in Titanium Backup?
Sent from my SPH-L710 using Tapatalk 2

MikeWjF said:
Question, is media server something that can be frozen in Titanium Backup?
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Click to expand...
Click to collapse
no, just force stop it a few minutes after you boot.
Sent from my SPH-L710 using Tapatalk 2

[Q] Battery sleuthing - your input is requested

Hello,
I was wondering if you guys would be kind enough to help me figure out what has been going on with my battery lately.. First up, here is all the relevant info:
Phone: Galaxy Nexus GT-i9250 GSM
Network: T-Mobile USA
ROM: Paranoid Android 2.54 - this is based on 4.1.2 - NOT the latest 4.2.1
Kernel: Franco Kernel Milestone 6 <-- My battery issues only started after I switched to this kernel. I had to ditch the stock kernel than came with PA because it was slow as molasses.
Here is the battery drain that shows 43% of total battery was drained in 6 hours
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Here are some more details that show how much time the phone was awake:
Partial wakelocks are shown here using BetterBatteryStats. I don't know what AudioOut_2 is but it's sucking down battery. Exchange is another battery hog evidently.. I don't understand why Google Plus is running, I NEVER open the program.
Here are the kernel wakelocks:
Here are the alarms that show which app is waking up the device how many times. LightFlow and Exchange seem to do this a lot. I have no idea why maps keeps waking my phone, I haven't opened Maps once or changed locations but the location service is relentless.
Here is CPU Spy showing that Deep Sleep is definitely working:
Please can anyone help me figure out why my battery drain is so out of control? I forgot to screenshot screen on time but it was less than 30 minutes. You can sort of see this from the graph on image #2.
Thank you in advance.

Bumping this in hopes that someone is able to help me figure this out.

it seems like your signal is fairly bad most of the time, that will drain your battery pretty bad since the device will try to seek better signal.
also, i would suggest you to upgrade to latest PA along with latest franco r361, I see a significant battery improvement after the upgrade.

light flow is keeping your phone awake as well.

hhwong said:
it seems like your signal is fairly bad most of the time, that will drain your battery pretty bad since the device will try to seek better signal.
also, i would suggest you to upgrade to latest PA along with latest franco r361, I see a significant battery improvement after the upgrade.
Click to expand...
Click to collapse
Thanks. Yes the signal is not great at my office, but it hasn't changed in the last few months. What has changed however, is how drastically my battery is now dying, this is recent.
I would update to the the new PA with 4.2.1 but there are a few things I'm not ready to give up yet like the old toggles etc. Once the new PA builds some of those older features back in, I'll be upgrading for sure.
Zepius said:
light flow is keeping your phone awake as well.
Click to expand...
Click to collapse
Yes it is, I don't know why it wakes up my phone so much. I tried checking the "reduce phone wakes" option, but that seems to miss notifications all the time.
Overall, even with not so great signal and light flow running, this battery drain just seems WAY too much, would you agree?

what is your screen on time?
and light flow has been known to kill battery. id honestly remove it.

Zepius said:
what is your screen on time?
and light flow has been known to kill battery. id honestly remove it.
Click to expand...
Click to collapse
Screen time was less than 30 mins
Sent from my Nexus 7 using xda app-developers app

How often do you charge the battery? Do you plug it in all the time? Do you run it dead all the time? Your battery may be getting shot out, happened to my wife's to the point it would not take a charge. New battery fixed it. Buy a battery of eBay for ten bucks. Worse comes to worse you have a backup battery if that wasn't the problem. Audio out only took 3.5% and most of the time was deep sleep. I think your battery is dying
Sent from my Nexus 7 using xda app-developers app

VonEsch said:
How often do you charge the battery? Do you plug it in all the time? Do you run it dead all the time? Your battery may be getting shot out, happened to my wife's to the point it would not take a charge. New battery fixed it. Buy a battery of eBay for ten bucks. Worse comes to worse you have a backup battery if that wasn't the problem. Audio out only took 3.5% and most of the time was deep sleep. I think your battery is dying
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
I charge it at least once a day - every night. Sometimes I'll plug it in during the day if I know I'm going out in the evening just so it'll be topped off when I go out. But I thought charging these batteries a lot didn't affect their ability to hold a charge?
I'll definitely buy a new battery either way, hopefully that's what it is.
In case anyone else has any other insight, please do share in the meantime.
Sent from my Nexus 7 using xda app-developers app

the7thson said:
In case anyone else has any other insight, please do share in the meantime.
Click to expand...
Click to collapse
remove lightflow. seriously.

Zepius said:
remove lightflow. seriously.
Click to expand...
Click to collapse
I'll miss it, but it's worth checking out what the battery does without LightFlow. Thanks!

the7thson said:
I'll miss it, but it's worth checking out what the battery does without LightFlow. Thanks!
Click to expand...
Click to collapse
For Maps wakeups. Try disabling auto location update if its not already. Open Maps > Settings > Location update (something like that)

Powers88 said:
For Maps wakeups. Try disabling auto location update if its not already. Open Maps > Settings > Location update (something like that)
Click to expand...
Click to collapse
Cheers. I do already have everything turned off, screenshot attached.
Could it be Google Now that's causing these location updates? It always knows how far away Home is when I'm away from Home.

the7thson said:
Cheers. I do already have everything turned off, screenshot attached.
Could it be Google Now that's causing these location updates? It always knows how far away Home is when I'm away from Home.
Click to expand...
Click to collapse
it is. google now periodically calls the gps to update your time to home

Zepius said:
it is. google now periodically calls the gps to update your time to home
Click to expand...
Click to collapse
The more I think about it, the more I believe that Google Now could be a major culprit in draining battery. I'm going to try disabling it entirely to test. Do you have any experience with that by any chance? On how it affects battery?

the7thson said:
Cheers. I do already have everything turned off, screenshot attached.
Could it be Google Now that's causing these location updates? It always knows how far away Home is when I'm away from Home.
Click to expand...
Click to collapse
Screenshot tells me its still on. Top of the menu, Location Reporting: Your location is updated Automatically

the7thson said:
The more I think about it, the more I believe that Google Now could be a major culprit in draining battery. I'm going to try disabling it entirely to test. Do you have any experience with that by any chance? On how it affects battery?
Click to expand...
Click to collapse
I use Google now and easily get 3 to 4 hrs of screen time
Sent from my Galaxy Nexus using Tapatalk 2

Powers88 said:
Screenshot tells me its still on. Top of the menu, Location Reporting: Your location is updated Automatically
Click to expand...
Click to collapse
You're right, I set it to "do not update your location". What does this do exactly? Looks promising though.
Sent from my Nexus 7 using xda app-developers app

Sudden Major battery drain on Note 4!

I took my note 4 off the charger this morning and used it for about 1.5 hours (no videos, just tapatalk and Web browsing) , and the battery went down to 73%. During this time I also noticed that my wifi toggle was turning off and on for no reason. I don't have smart network control check on.
Then I went about my day and set my phone down, asleep, and didn't touch it. At 11am I hear the "low battery" beep. I go over to my phone and it's at 5%!
My battery has never been this bad before, and this just started today with no app changes. As I'm typing this, my phone went from 20% to 16%.
Is anyone else experiencing this issue (both wifi toggling and battery issue) and know a fix? I've attached my battery graph from today.
Edit: It looks like the phone was "awake" all day today except for the time it turned off due to low battery. Also, it looks like Bluetooth is using way more battery than it should be.
Thanks!
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ireknole said:
I took my note 4 off the charger this morning and used it for about 1.5 hours (no videos, just tapatalk and Web browsing) , and the battery went down to 73%. During this time I also noticed that my wifi toggle was turning off and on for no reason. I don't have smart network control check on.
Then I went about my day and set my phone down, asleep, and didn't touch it. At 11am I hear the "low battery" beep. I go over to my phone and it's at 5%!
My battery has never been this bad before, and this just started today with no app changes. As I'm typing this, my phone went from 20% to 16%.
Is anyone else experiencing this issue (both wifi toggling and battery issue) and know a fix? I've attached my battery graph from today.
Edit: It looks like the phone was "awake" all day today except for the time it turned off due to low battery. Also, it looks like Bluetooth is using way more battery than it should be.
Thanks! View attachment 3511266
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Click to expand...
Click to collapse
So I found the culprit for the wifi. I have a tasker profile that turns it off when I'm not connected via Bluetooth to my house phone. This means that there is something wrong with my Bluetooth. Nothing has changed with my house phones. Any ideas on the Bluetooth?
Sent from my SM-N910V using Tapatalk

ireknole said:
So I found the culprit for the wifi. I have a tasker profile that turns it off when I'm not connected via Bluetooth to my house phone. This means that there is something wrong with my Bluetooth. Nothing has changed with my house phones. Any ideas on the Bluetooth?
Sent from my SM-N910V using Tapatalk
Click to expand...
Click to collapse
Try getting rid of the Tasker profile. I don't think it's your phone. I bought Tasker and tried to set up some cool stuff but it kept messing things up. I don't use it any more. Android does a pretty good job of taking care of stuff without it.

stueycaster said:
Try getting rid of the Tasker profile. I don't think it's your phone. I bought Tasker and tried to set up some cool stuff but it kept messing things up. I don't use it any more. Android does a pretty good job of taking care of stuff without it.
Click to expand...
Click to collapse
Thanks that was actually the first thing I did when I found out it was a tasker problem. I don't keep wifi on all the time due to battery drain (unless I'm mistaken on that?) so I'll have to bring it back eventually. I didn't think android had a "turn wifi toggle on when home" ability.
I unpaired my house phones and I'm going to repair them tonight and see if that helps.
Sent from my SM-N910V using Tapatalk

Lollipop doesn't let you toggle Wi-Fi with Tasker anymore w/o root access.
Sent from my SM-N910V using XDA Free mobile app

RedsonRising said:
Lollipop doesn't let you toggle Wi-Fi with Tasker anymore w/o root access.
Sent from my SM-N910V using XDA Free mobile app
Click to expand...
Click to collapse
You can still toggle wifi. It's gps that you can't toggle without root.
Sent from my SM-N910V using Tapatalk

I've had this happen to me twice including just now hence why I searched for posts on this. Seems like it happens randomly when I stop using WiFi hotspot and I'm at home with my WiFi automatically trying to turn on. I use wifimatic which turns WiFi on when I'm near a cell tower near my home and shuts off when out of range of that tower. My WiFi won't automatically connect if I turn off my Hotspot, so I have to restart. Just twice now this drained my battery from like 30 to 0 in less than a minute. It's not often it happens and I'm home anyhow so putting it on the charger isn't a problem. Maybe this helps but maybe not.

It's been my experience that leaving wifi on doesn't drain the battery very much. I leave mine on. Besides, the quick toggle is very easy to use. Trying to automate it is more trouble.
Sent from my SM-N910V DE w/MoRom

Terrible battery life (H815, 6.0 Marshmellow)

Hi all,
I've had my LG G4 since September, and it's been a good phone. However, more so recently, the battery life has been terrible. When Doze decides to work on my phone the battery life is average, but it rarely seems to work. I use over 60% battery in 5 or 6 hours, and that's with most of the time the phone screen being off.
For example, tonight I went to see the new Star Wars film. Using that as a guide, my phone screen was off for about ~3 hours during that time. However, see attached, the battery is just being drained. There aren't any particular apps that I see using 90% battery or whatever - in fact, using a battery app, it looks like phone radio is using an incredible amount.
i.imgur.com/MCQ6Yz0.png
i.imgur.com/ziZEoEz.png
i.imgur.com/a8J9ufZ.png
Any tips for increasing the battery life? I don't see myself as an over user, but I often come out of an 8 hour work shift with just 20% left, and that's with mild web browsing every now and then, and maybe 20 minutes of YouTube video.
I'm thinking about doing a full restore on weekend after backing up my texts, or even ordering a new battery, but I don't feel this should be necessary.
My screen brightness is always 30% or lower. I don't know if this would have damaged the battery, but I use an Aukey quick charger.

-since how many days are using marshmallow ??
-What version ?? V20B or V20A ?
-Did you do a full factory reset after upgrading to MM?
Sent from my LG-H815 using Tapatalk

Hani88 said:
-since how many days are using marshmallow ??
-What version ?? V20B or V20A ?
-Did you do a full factory reset after upgrading to MM?
Sent from my LG-H815 using Tapatalk
Click to expand...
Click to collapse
Thanks for replying.
I've been using it for 16 days now.
I updated though LG Bridge, and software info says V20a-EUR-XX
I've not done a factory reset, no. Will that help? All my photos, music and contacts are on Google's servers so I would just need to back up SMS and a list of apps.

yatesl said:
Thanks for replying.
I've been using it for 16 days now.
I updated though LG Bridge, and software info says V20a-EUR-XX
I've not done a factory reset, no. Will that help? All my photos, music and contacts are on Google's servers so I would just need to back up SMS and a list of apps.
Click to expand...
Click to collapse
you are welcome
I think factory reset will help you.. My MM battery is very well
for me my sms storage is SD card
you can do it
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Thanks. It looks like my SMS are already saved to my SD card, so hopefully they will work straight away.
I really hope a reset fixes it, as I heard such great things about the LG G4 battery (with people posting it can last 24 hours or more!), and this is very disappointing. I'm off this weekend, so I will do it then.
If anybody else has any fixes as well, I would love to hear them if this doesn't work! The phone is great so far... aside from this.

yatesl said:
Thanks. It looks like my SMS are already saved to my SD card, so hopefully they will work straight away.
I really hope a reset fixes it, as I heard such great things about the LG G4 battery (with people posting it can last 24 hours or more!), and this is very disappointing. I'm off this weekend, so I will do it then.
If anybody else has any fixes as well, I would love to hear them if this doesn't work! The phone is great so far... aside from this.
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you are welcome
and please give marshmallow few days chance after updating to V20B then tell us how the battery goes
Sent from my LG-H815 using Tapatalk

you have a rogue app or something, there is nothing wrong with Marshmallow 20B (or 20A for that matter) and battery life. I get insane battery life on this phone, often 22 - 30 hours of fairly heavy use.
Now granted, my phone is rooted, bootloader unlocked, running stock 20B and I have installed a couple of apps to optimize it such as AdAway, LBE security, and KinScreen, but still, you have a misbehaving app most likely that needs to be kicked off your phone!

Is there a way of finding which app? Nothing stands out. I've just taken another screenshot (disabling uploads Google Photos didn't fix it)-should screen off be using this much battery?
imgur.com/NwpJ2Iw
A reset is definitly in order tomorrow

yatesl said:
Is there a way of finding which app? Nothing stands out. I've just taken another screenshot (disabling uploads Google Photos didn't fix it)-should screen off be using this much battery?
imgur.com/NwpJ2Iw
A reset is definitly in order tomorrow
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Click to collapse
sure, start with turning on Developer mode by hitting Build Number in rapid succession a bunch of times in Settings ---> About Phone ---->Software Info
then look in the new Developers Options section of Settings and look at Running Services & processes - you can also download an app for this such as Elixir 2
another good diagnostic tool is heat - heat and battery life are proportional, if your phone runs cool, it will get long battery life, if you pick it up and it is warm around the power/volume buttons, then something is amiss - you have a runaway app or process
download a tool like CPU Temp from the Play store and see what the CPU temp is when the phone is idle or you are doing something light like reading an article - it should be in the 78 - 89° F. range (25 - 32° C.) If the phone is not in this temp range, then something is amiss! - Also keep in mind that the main battery drain on the phone in normal operation is the display - keep auto-brightness on, and keep the display off when it is not needed! - also turn off stuff you are not using, such as Bluetooth, NFC, etc.

I did a factory reset as suggested above, and I think it fixed it. I didn't restore my LG backup as I figured that that'd restore the problem, so went through and downloaded apps again. I then left it on overnight.
After 6 hours it was still at 100% on Wifi, which is great! I then used the phone for ~2 hours (apparently pretty heavily) which actually dropped it to 58% - whoops. I then stopped using it again but this time without wifi, and it didn't keep at the same % - it seemed to drop 10% in about 2 hours. The only things I'd changed since then was install Skype (which I might delete if that's the issue), and had it on mobile data.
imgur.com/n58dP1D
Could mobile data REALLY make that much of a difference? I think I'll leave it unplugged again tonight and not on wifi, and see what it does. This is an issue though if it is mobile, as I'm often not connected to a network.

Seems like mobile radio active bug, I have the same problem. While mobile data is active, my battery drains with the screen off. I have this issue since v20a and no - factory reset doesnt help at all...