Develop Bugs

Horrible Battery Life

It would seem that after I installed the AT&T update to dumb down thr search on my phone, my battery life has been terrible. Yesterday it was down to about 30% after only 4 hours of light use with the processes "Android OS" and "Cell Standby" taking up the most battery. I can't even get through the day with this phone. Some help would be much appreciated.

After any update, give it a couple days to level out. Until then, just carry an extra charger and plug in when you can.

The update was installed at least a week ago.

In that case, backup everything and do a factory reset when you have a fully charged battery.

Alright I'll give it a shot. I needed to do that anyway as my clipboard no longer works and consistently crashes. :/

I did a factory reset a few weeks ago and that solved it for me.

Do you have any specific methods for backing up a phone that isn't rooted? I've got nova backed up, but I would like to make sure everything else is too.

FlyinHi said:
Alright I'll give it a shot. I needed to do that anyway as my clipboard no longer works and consistently crashes. :/
Click to expand...
Click to collapse
Are you receiving push email? that was the major drainer for me. apparently the android email app has a bug.
Regarding clipboard...delete everything in data/clipboard; force close the 'test service' app and then restart your phone

FlyinHi said:
Do you have any specific methods for backing up a phone that isn't rooted? I've got nova backed up, but I would like to make sure everything else is too.
Click to expand...
Click to collapse
The best method would be to use titanium backup but since your not rooted I don't know what options you have except to use the google backup but that ain't to good since its only app data.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Hi all,
Since getting the phone from day one, I really never had a problem with the battery. Lately however, I've noticed a significant drain in battery over night. I tested the drain a few times over several nights, and even put my phone into "airplane" mode to help save battery.
Below are my results from going to sleep at 1:30am with 100% battery power and in airplane mode and waking up at 9:30am the next morning. I get a 12% decrease in battery over night for doing nothing over the course of 8 hours.
The only thing I've noticed differently is that Chrome is starting to use battery which is odd because I rarely use Chrome to begin with.
Any ideas to help this? What should I do?
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Death&co said:
Hi all,
Since getting the phone from day one, I really never had a problem with the battery. Lately however, I've noticed a significant drain in battery over night. I tested the drain a few times over several nights, and even put my phone into "airplane" mode to help save battery.
Below are my results from going to sleep at 1:30am with 100% battery power and in airplane mode and waking up at 9:30am the next morning. I get a 12% decrease in battery over night for doing nothing over the course of 8 hours.
The only thing I've noticed differently is that Chrome is starting to use battery which is odd because I rarely use Chrome to begin with.
Any ideas to help this? What should I do?
Click to expand...
Click to collapse
I had the same problem this morning chrome had like 26% and it showed no cpu use my phone was down from around 88% to 56% I know for a fact it was chrome so try un installing it.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Yeah I've noticed a huge jump in Android System usage since I flashed the UCLG1 update.
Currently
18h 27min on current charge
screen on 1h 22min
Android system = 51%

DudeWatsThat, thanks I'm going to give it a try and see if uninstalling Chrome changes anything. It just boggles my mind that in airplane mode over night it would drain the battery 12%

nest75068 said:
Yeah I've noticed a huge jump in Android System usage since I flashed the UCLG1 update.
Currently
18h 27min on current charge
screen on 1h 22min
Android system = 51%
Click to expand...
Click to collapse
That
ain't normal for sure.
Death&co said:
DudeWatsThat, thanks I'm going to give it a try and see if uninstalling Chrome changes anything. It just boggles my mind that in airplane mode over night it would drain the battery 12%
Click to expand...
Click to collapse
Yea its definitely a rare bug since Chrome wasn't even displaying cpu usage.
Sent from my GSIII

i second that problem about Chrome. I think it is a bug regarding the builtin flash code. my battery was great until i installed Chrome then it got really bad. I uninstalled Chrome and my battery life jumped up big time. huge different. too bad i really like Chrome but no go right now

Not sure if it's the same issue, but I had some problems with battery life in Chrome until I disabled Tilt Scrolling under Developer Options in the Chrome menu.

my battery life is great even after the update

Huge battery drain - Android Core Apps

Hi,
I'm curious if anyone else experienced the same battery drain caused by the Android Core Apps. I used to get at least 2 hours worth of screen time on my gnex, but now it's down to maybe 3/4 of an hour. Settings -> Battery shows Android Core Apps using about 40% of the battery. The phone gets hotter than usual when turned on. Sleep time doesn't seem to be affected.
I also noticed Contacts loading way slower than before with reloading each picture. I tried uninstalling HaxSync but it didn't fix the issue.
Phone is a yakju build with the official OTA JellyBean installed.
If anyone has any ideas I'd be thankful. I tried the usual phone reboot, taking out the battery...Didn't try hard reset yet since it's something I want to avoid at the moment.

This is funny cus lately i see the same thing.sometimes the cpu reaches 100 % because of it, especially the applications search provider process.i thought it was because of something i installed but now that you mention it too then it could he something else.maybe it's Google server issue or something? I'm still with ICS btw.
Sent from my Galaxy Nexus using xda app-developers app

That's exactly what happens. The phone heats up as well. Especially the right top corner of it.

Same here
I'm seeing the same thing here and I'm on JB on my GN. Have seen this for a couple of days now and android core apps is really eating all the battery just now. Even more than the screen
Any ides of how to proceed?

Samesiesz
:crying:

My phones batt life is also not as anywhere near as good as other peoples. I also use Yakju phone, and since JB, the top right corner of my phone gets super hot at times

It looks like we're all experiencing the same thing. So far nothing I've tried worked. Can you guys check if people (contacts) app takes longer to load the contacts than usual?
Sent from my Galaxy Nexus using Tapatalk 2

same here
i have the same problem..... it all happened after jellybeen. today it's hot as hell, and taking for ever to charge. i am going to wipe it clean and go from there.

Yes it's a problem. I try to keep my phone plugged in when I'm at my desk but sometimes I forget. When I forget the battery gets low I make sure these two items are close and fully charged.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Sent from my Galaxy Nexus using xda premium

I don't have "Android Core Apps" listed on my battery usage; I have "Android OS" and "Android System" but neither is a significant contributor toward the battery drain. My Contacts app also seems to load just fine.
Could you perhaps grab a screenshot of your Battery information page? Both the list of apps and the zoomed-in graph, please.
Another idea might be to try out an app like SystemPanel or Diagnosis to try and get a better idea of exactly which application is using up your juice.

Funny thing is that I didn't have Android Core Apps listed on my battery usage neither...at least not before this started happening. Somehow today seems fine though...nothing changed, nothing new installed or nothing old removed...just charged my phone overnight. It was going on for a week now, but today it's gone...I have a feeling it might come back randomly though. At the moment I'm seeing 84% left after 6 hrs off charger and moderate usage (about 30 mins screen time).
Contacts load considerably faster and phone doesn't get hot either...

roro45 said:
I'm seeing the same thing here and I'm on JB on my GN. Have seen this for a couple of days now and android core apps is really eating all the battery just now. Even more than the screen
Any ides of how to proceed?
Click to expand...
Click to collapse
Add me to the list. I also am seeing the heat up towards the top back.

I am having this issue as well.
Seems like opening the contacts is slow. Same with call logs.
The other thing I notice is when someone calls you, there is a delay before the caller name/pic shows up.
Update: I uninstalled Viber for Jelly Bean, everything is back to normal.

I have Viber installed as well, but it seems my issue has fixed itself even with viber still installed.
I'll check if maybe there was an update lately.
Sent from my Galaxy Nexus using Tapatalk 2

Try booting in safe mode. Long press the power off option
Sent from my Galaxy Nexus using xda premium

I think you cannot discuss allthis without referring to the kernels and roms in use.

Like I mentioned, I'm on stock JB - 4.1.1
Unlocked, but not rooted.
Sent from my Galaxy Nexus using Tapatalk 2

Well I have wiped out the phone and reset it. Seems to work better and the battery issue is gone.
Using stock on a bell network phone. Still need a bigger battery.
Sent from my Galaxy Nexus using Tapatalk 2

Same issue
The same exact problem here on my GNEX with JB (Android core apps eating up battery and contacts opening slow) . It seems to have started when I've installed the latest updated Viber App.
I've just unistalled it and will have a check on battery life from now on.

Uninstalled Viber
windmill_81 said:
The same exact problem here on my GNEX with JB (Android core apps eating up battery and contacts opening slow) . It seems to have started when I've installed the latest updated Viber App.
I've just unistalled it and will have a check on battery life from now on.
Click to expand...
Click to collapse
I uninstalled the latest version of Viber since it crashed on a regurarly basis and now my battery lasts a lot longer and Android core apps is not shown in the list of apps eating battery! Even my contact app loads a lot faster now.
Running JB on a stock GNEX.

Worst battery drainage profile I've had

Hello xdadev!
I was hoping someone may point me in the right direction (I have searched but have not found this particular issue in the forums).
After an 8-10 hour charge using my samsung wall AC adapter (1 amp) I unplug my phone and check email, send a few whatsapp/line messages, browse the internet on chrome. the very FIRST app I use causes huge battery drain. For example if the first thing I do after unplugging the phone is use whatsapp then whatsapp causes 70-80 percent battery drain over the next 15 minutes. As an example this morning I used whatsapp first on my phone, then chrome. Over the next 15 minutes my battery drained from 100 percent to 79 percent (in 15 minutes!). The phone also gets warm during this time. When I check my drainage whatsapp is at the top of the list next to screen and my screen is at the dimmest brightness.
The next part is variable. After about 15-20 minutes of constant use the rate of discharge changes to a slower rate. Easily can tell on better battery stats and the native battery monitor software. Sometimes I can curtail this super rapid discharge by force closing every app i start for the first time after unplugging the phone and restarting that app.
I don't know of any other i747 user who goes from 100 percent to 79 percent in 15 minutes. Would appreciate some insight!
Btw i'm rooted running CM 10.1.2 and here is a graphical representation:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
EDIT - Update 8/17/2013 - rebooting into cwm and wiping the cache and dalvik cache appears to have improved the battery situation. Drainage is more reasonable.

With the phone idle now for the past hour I have gone from 75 to 55 percent battery. So in the less than two hours my phone has been unplugged it has drained about 50 percent battery. I dont' see a ton of wakelocks either. Now as time has passed you can see the INSANE battery drain when i first unplugged my phone.
Here are some relevant screenshots:

So what happens if u unplug at 100%, and then just leave the phone alone for a bit? Try greenify from the market, it's free and its awesome!!

DMF1977 said:
So what happens if u unplug at 100%, and then just leave the phone alone for a bit? Try greenify from the market, it's free and its awesome!!
Click to expand...
Click to collapse
I use greenify, and i agree it's awesome!!! I don't greenify whatsapp however because I wouldn't receive notifications when I get new messages.
If I leave the phone after I unplug it, sometimes it discharges at a slow rate, sometimes at a fast rate. It's tough to predict.
One thing i've noticed is if I charge it by usb port on my computer it seems to hold the charge better and I would never get this kind of spiked discharging.
Maybe it's a hardware issue?
I've had to charge it several times in the car today (and on a long drive as well) ... check out that loss of charge when I woke up today!

Yea, I'm kinda at a loss bro. Unless your phone/battery is older? Might be time to replace the battery and see if that does any good? Wish I could be of more help...

Clear cache and dalvic cache. Could be a Google app constantly chugging like maps or something.

aeppacher said:
Clear cache and dalvic cache. Could be a Google app constantly chugging like maps or something.
Click to expand...
Click to collapse
Thanks for the tip, but wouldn't the offending google app show up in better battery stats and also in wake lock detector?

sxorpyon said:
Thanks for the tip, but wouldn't the offending google app show up in better battery stats and also in wake lock detector?
Click to expand...
Click to collapse
from what I have heard, google apps can sometimes be very sneaky and hard to detect. its worth a shot

Turn off data if the drain stops you know its an app that's locked into using your data and causing high wake locks. Apps that show low to no data usage when you know you use them usually show up in android is as background for some reason. Ie (YouTube). Really just freeze one app at a time to test them
Sent from my SGH-I747 using xda app-developers app

Take out your battery lay it on its side, if it spins like a top it's bad and needs replacing, seen many different samsung phones do that.
Making the iPhone jealous one user at a time.

mkfryan said:
Take out your battery lay it on its side, if it spins like a top it's bad and needs replacing, seen many different samsung phones do that.
Making the iPhone jealous one user at a time.
Click to expand...
Click to collapse
LOL a battery within a phone within a battery within a phone.
Interestingly, I booted into cwm and cleared cache and dalvik cache ... charged up back to 100 percent and now i'm 20 minutes in and at 98 percent ... I guess I have to do that every time i unplug?

sxorpyon said:
LOL a battery within a phone within a battery within a phone.
Interestingly, I booted into cwm and cleared cache and dalvik cache ... charged up back to 100 percent and now i'm 20 minutes in and at 98 percent ... I guess I have to do that every time i unplug?
Click to expand...
Click to collapse
Nah it might have just been a one time thing and you might have fixed whatever app was doing it. If it happens again. Redo the clearing. Slap that thanks button! And put a solution in op for future people!

Massive drain battery

Hi,
I have huge problem which hasn't occurred for the first time. I left my t520 with 92% and fell asleep. When I woke up it was at 40%. I had wifi off, and turned off wifi scanning when eve n off (which caused drain esrlier). According to wake lock detector the process which keeps running can be seen under. Please help me. In settings it only says that android process (97% usage of battery) has used CPU for 10h42mi and stood awake for 7h45min
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
http://imgur.com/wNEhSFt
P.s. This tab is complete rubbish....

i would suggest go into settings....->battery. this should show u what is using your battery the most. if its a app delete it and see if it works. if not i would recomend doing a factory reset. this is what i do when something eats my battery alot.
foxracer89 said:
Hi,
I have huge problem which hasn't occurred for the first time. I left my t520 with 92% and fell asleep. When I woke up it was at 40%. I had wifi off, and turned off wifi scanning when eve n off (which caused drain esrlier). According to wake lock detector the process which keeps running can be seen under. Please help me. In settings it only says that android process (97% usage of battery) has used CPU for 10h42mi and stood awake for 7h45min
http://imgur.com/wNEhSFt
P.s. This tab is complete rubbish....
Click to expand...
Click to collapse

foxracer89 said:
Hi,
I have huge problem which hasn't occurred for the first time. I left my t520 with 92% and fell asleep. When I woke up it was at 40%. I had wifi off, and turned off wifi scanning when eve n off (which caused drain esrlier). According to wake lock detector the process which keeps running can be seen under. Please help me. In settings it only says that android process (97% usage of battery) has used CPU for 10h42mi and stood awake for 7h45min
http://imgur.com/wNEhSFt
P.s. This tab is complete rubbish....
Click to expand...
Click to collapse
Are you using Songza? It has big problems right now with battery drain. The deal is, is probably not the device. There is an app that is causing your issue.
Sent from my SM-T320 using XDA Premium 4 mobile app

The tab yesterday got from 30% to complete 0% with everything off (aeroplane mode, sync off etc.) just laying on the desk.
In settings its shows that battery is drained only by Android process.
I was thinking about what might be the cause and just realised that it started to happen just affter purchase of original samsung case for this tab. Is it possible that it had impact on one of the processes? Cause CPU is active almost all the time despite neither app running in the background... Maybe it's due to the magnetic thingy which wakes the screen?

foxracer89 said:
I was thinking about what might be the cause and just realised that it started to happen just affter purchase of original samsung case for this tab. Is it possible that it had impact on one of the processes? Cause CPU is active almost all the time despite neither app running in the background... Maybe it's due to the magnetic thingy which wakes the screen?
Click to expand...
Click to collapse
If the magnet is turning the tablet on, the screen would be on, and you can see that even with the cover of the case closed. So if you can see the screen if off, then I would say no, the magnet is not causing your drain problem.
Do you have Skype installed? This is a known battery drain problem on Kitkat as well. Its a bug within Kitkat itself, so maybe that is why its being reported as the Android process, and not one of your apps.

take a screenshot of you battery

redpoint73 said:
If the magnet is turning the tablet on, the screen would be on, and you can see that even with the cover of the case closed. So if you can see the screen if off, then I would say no, the magnet is not causing your drain problem.
Do you have Skype installed? This is a known battery drain problem on Kitkat as well. Its a bug within Kitkat itself, so maybe that is why its being reported as the Android process, and not one of your apps.
Click to expand...
Click to collapse
I don't think it's an app problem. I have only few apps installed (news reader, 2 games, fb and few random apps. I'll upload the screenshot when I'll be at home

Yep, my battery has started playing up. It likes to say it's 21% but then goes to 15, then between 2 and 4 within a couple of minutes. Sometimes runs on 1% for ages. But then dies, I turn it back on and it says 21%
Don't know if is root related. Our if I just need a hard reset. Going to try draining battery fully, then charging to full with device off
Sent from my SM-T520 using XDA Premium HD app

I also have never seen such a huge battery drain on any samsung or android device. For once, if you dont need it, go into settings and location services. Just disable it completly with that switch. This reduces the drain a lot, but is still way to high...
For me, it drains about 20% overnight with location on (completly offline) and about 10% without location services.

I have the same problem as well. It will continuously drain from 90-50 in minutes and then 50-15 and so on. 1% sometimes lasts for 30 minutes+ and when I restart it will be 15+% again. I thought it might be because of custom roms so I reset it back to stock many times and same problem. The only apps I have installed are adobe reader and es file manager.

JAIMEREYES said:
I have the same problem as well. It will continuously drain from 90-50 in minutes and then 50-15 and so on. 1% sometimes lasts for 30 minutes+ and when I restart it will be 15+% again. I thought it might be because of custom roms so I reset it back to stock many times and same problem. The only apps I have installed are adobe reader and es file manager.
Click to expand...
Click to collapse
boy, you're digging out a two year old thread!!
if you have such a battery drain you have different (unsatisfying) choices:
1. try battery calibration or other roms
2. throw you tab away + buy a new one
3. buy a new battery
4. accept it (like me)
5. wait until someone brings an awesome new rom which will give an awesome battery life
(sorry for hidden sarcasm but this tablet is just a big disappointment (for me))

I don't think you should throw away devices or buy new batteries without first analyzing what the problem could be. If you are rooted, download an app such as Wakelock Detector and BetterBatteryStats first, make sure there isn't some rogue app or process that is constantly running in the background. Also, if you are running the 8.4 (or perhaps it also works with the 10.1 / 12.1), check out the link in my signature on how to reseat your battery. Many people have found success with all kinds of battery problems.

[MM] Got Poor Battery Life? No Deep Sleep - Possible reasons, and possible fix inside

Like a lot of people I found myself with battery woes on the G4, at first my battery was comparable to my G3, if not a little bit better but over time, and certainly since MM was released, my battery life was quite frankly awful.
Long Story
I was losing power rapidly, even when I was barely touching the phone - so I finally decided to look into it. After carefully monitoring apps, wakelocks etc nothing looked out of place, everything was working normally until I installed my old faithful app - SetCPU, this is a nice basic app that just shows what your CPU has clocked too and how long it spent there in a given timescale and one thing alarmed me greatly. I was getting less than one minute of deep sleep in every 60 minutes the phone was running - now if I had been using the phone for 58 minutes of that hour I would expect this, only I hadn't!
I did more testing, and more testing and more testing but the results were the same, the phone barely entered deep sleep, and when it did it didn't stay there very long.
Now as I said, using all the other apps, and android stats, nothing looked particularly out of place and after a few days of trying everything under the sun to fix the problem I decided to go nuclear. I wiped the phone, installed no third party apps but setcpu and began testing. I left the phone for a period of 10 minutes to see what the deep sleep value was (looking for it to be somewhere between 80 and 100% of time, which it was!) and it seemed to be back to normal, working fine. So then I started to install my core apps, one by one running the same 10 minute test between each one, idea being eventually I would hit whatever app it was that caused me problems.
So I installed upwards of 30 apps, and everything was still fine, in 10 minutes of not using my phone I was getting around 9 minutes of deep sleep, which is what you would expect.
And then came facebook, now I know there are lots of reports of facebook being a bad app blah blah blah, but I have never seen facebook react like this before, and I don't know if it was marshmallow or a mixture of marshmallow and LG - but when facebook is installed my phone stopped sleeping again, at first it wasn't a huge change, but was noticeable it dropped to deep sleeping at about the 40% mark so I had 4 minutes deep sleep in my 10 minute test - force closing facebook made no difference, I tested it again and again, rebooted and again - same results.
I then installed facebook messenger, and my deep sleep dropped again, to about 20%.
I then uninstalled messenger - no change.
I then rebooted - back to 40%
I then removed facebook - no change
I then rebooted - back to 80+ %.
TLDR: The "Solution"
Now for some of you this won't be a solution as you will claim you need the apps, but there are third party alternatives out there that work pretty well without causing this issue.
Facebook (and facebook messenger) on stock MM builds (at least on the G4) causes the phone to hardly ever enter "deep sleep", this means it is always running a CPU clock, albeit the lowest setting, but it consumes far more power than it needs too especially when the phone is not in use.
After removing them my phone is now sleeping fine and my battery life is back to being very good - lost 4% in the last 8 hours (albeit idle, I was asleep), which is much better than losing 4% an hour that I was before facebook was removed.
Go give it a try, install setcpu, reset the timer close go back to your home screen then leave your phone for 10 minutes then check your deep sleep values, then try it after removing facebook (and rebooting).
Let me know how you get on.

Hold your horses!
You should try Amplify:
https://play.google.com/store/apps/details?id=com.ryansteckler.nlpunbounce&hl=en_GB
http://forum.xda-developers.com/xposed/modules/mod-nlpunbounce-reduce-nlp-wakelocks-t2853874
I have used it to disable Facebook services and limit the wakelocks and alarms to every 3600 seconds. Last night I had 5hrs of deep sleep with no interruption whatsoever.

dtective said:
Hold your horses!
You should try Amplify:
https://play.google.com/store/apps/details?id=com.ryansteckler.nlpunbounce&hl=en_GB
http://forum.xda-developers.com/xposed/modules/mod-nlpunbounce-reduce-nlp-wakelocks-t2853874
I have used it to disable Facebook services and limit the wakelocks and alarms to every 3600 seconds. Last night I had 5hrs of deep sleep with no interruption whatsoever.
Click to expand...
Click to collapse
only any use if you have root

So interesting...
Can you do those tests again after disabling the Marshmallow battery optimizing for Facebook app ?
Sent from my LG-H815 using Tapatalk

I was having these issues too after upgrading to MM. My battery life was appalling and Facebook was keeping the phone awake for hours at a time. I simply did a full factory reset, and then restored my phone from the most recent backup. My battery life is now excellent, even with Facebook and Messenger installed

There was a wakelock introduced with the new version of facebook about a week ago not sure if it is still relevant. It goes by the name of bugreporting service. Something like that. The same goes with FB messenger. I got pissed off with the official app because of this and got Metal instead

I don't run Facebook (never have) or any messaging other than Hangouts and battery is always great (2-3 days). If you don't need it...uninstall it.
Kindle app was always a great one for running constantly in the background for no reason. So I bought an actual Kindle and didn't use the app.

I totally agree with the OP, I started having the exact issues after I updated to the latest facebook and messenger apps and my phone was entering deep sleep at all. I removed them last night and its much much better now.

My girlfriend's g3 with mm gets this message lots of time
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Sent from my LG-H818 using Tapatalk

Until a few weeks ago, the Facebook app had a setting where you could choose the sync frequency and I was able to set mine to every 4 hours.
This setting appears to have disappeared now. Could this be the problem?

Nope. It's not the solution. I uninstalled Facebook but am barely getting 2+ hours of screen-on time on v20b.
A Redditor mentioned that some process called 'logd' is eating up resources and killing battery life. I used Terminal Emulator to verify it.
Sent from my LG-H815 using Tapatalk

logd is a separate issue that no one has quite worked out what is causing it - it is to do with error reporting, either from LG or Google apps.

That redditor here. Logd isn't actually logging anything when its CPU usage hits 16% (the problem). You can verify by running logcat in adb shell while watching cpu usage in terminal emulator on phone.
I removed logd by renaming the binary, it's over doubled by SOT from 1-2h to 4+h. As this is my first post on xda I can't link the thread I made on reddit about it -- but you'll find it on /r/lgg4 on the first page ("PSA: How to fix 6.0 / marshmallow logd battery drain (TWRP/root)")