Develop Bugs

[Q] Rapid Battery Life depletion during sleep

Hey XDA friends. I got the Verizon HTC One a few weeks ago and battery life started out fantastic. When I put away to go to sleep it only lost 7% all night with GPS on and wifi on and all that and I was astonished. However as time went on I found those results kept getting worse and worse until I was draining 30% in a night. I went and uninstalled battery guru and now I only drain 12% a night. Some nights however I still lose 20% in a night with sleep mode on. How do I check what keeps waking my phone up and draining my battery. I'm afraid this will affect my phone's battery in the long run. I will start disabling GPS at night but I wish I still had that 7% in a night. How do I check what is messing with my phone???

nscian12 said:
Hey XDA friends. I got the Verizon HTC One a few weeks ago and battery life started out fantastic. When I put away to go to sleep it only lost 7% all night with GPS on and wifi on and all that and I was astonished. However as time went on I found those results kept getting worse and worse until I was draining 30% in a night. I went and uninstalled battery guru and now I only drain 12% a night. Some nights however I still lose 20% in a night with sleep mode on. How do I check what keeps waking my phone up and draining my battery. I'm afraid this will affect my phone's battery in the long run. I will start disabling GPS at night but I wish I still had that 7% in a night. How do I check what is messing with my phone???
Click to expand...
Click to collapse
go to settings/power/usage. this will tell you which app is using the most of you battery. also you should never have gps on while youre sleeping. you might also want to turn off auto-sync and then re-enable it after you wake up. you can create a widget to do just that. if you need help with that, just let me know.

Turn data Wi-Fi and gps off lol.... You are asleep
Sent from my HTC6435LVW using xda app-developers app

nscian12 said:
Hey XDA friends. I got the Verizon HTC One a few weeks ago and battery life started out fantastic. When I put away to go to sleep it only lost 7% all night with GPS on and wifi on and all that and I was astonished. However as time went on I found those results kept getting worse and worse until I was draining 30% in a night. I went and uninstalled battery guru and now I only drain 12% a night. Some nights however I still lose 20% in a night with sleep mode on. How do I check what keeps waking my phone up and draining my battery. I'm afraid this will affect my phone's battery in the long run. I will start disabling GPS at night but I wish I still had that 7% in a night. How do I check what is messing with my phone???
Click to expand...
Click to collapse
Do you use blinkfeed, that will kill your battery pretty fast. Even if you don't think you are using it, go check and see if it's syncing anything in the settings. I thought mine was turned off, but then I logged into facebook (turned sync off in facebook), later I found that blinkfeed was syncing it anyway w/out my knowledge.

dspcap said:
Do you use blinkfeed, that will kill your battery pretty fast. Even if you don't think you are using it, go check and see if it's syncing anything in the settings. I thought mine was turned off, but then I logged into facebook (turned sync off in facebook), later I found that blinkfeed was syncing it anyway w/out my knowledge.
Click to expand...
Click to collapse
you cant turn blinkfeed off...

.kronos. said:
you cant turn blinkfeed off...
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Click to collapse
You can go into settings and make sure everything is unchecked. Mine had several checked by default and it was draining battery.
Sent from my HTC6500LVW using Tapatalk 4

Update: Battery only drained 10% last night with GPS off, Blinkfeed never updates on its own and all social networks are checked off (I don't like my social networks on Blinkfeed) other than that though everything seems to be in check. If anyone else has anyway to improve that 10% let me know (by the way the 10% was drained during 9 hours of constant sleep I went from 77 to 67)

nscian12 said:
Update: Battery only drained 10% last night with GPS off, Blinkfeed never updates on its own and all social networks are checked off (I don't like my social networks on Blinkfeed) other than that though everything seems to be in check. If anyone else has anyway to improve that 10% let me know (by the way the 10% was drained during 9 hours of constant sleep I went from 77 to 67)
Click to expand...
Click to collapse
airplane mode...
Really, 1% per hour on standby with cellular radios on is pretty acceptable. Depending on signal strength, the radio could be pulling that just to maintain a connection to the tower.

Thanks everyone!
With GPS off, Sleep mode on, and NO BATTERY HELPER APPS (Battery guru was diminishing my battery life) I got a record breaking (for me) 4% loss in battery life during my 8 hour night's sleep, not bad if I do say so myself, after that my battery has been a lot better. I wish Verizon would give us HTC's battery saving software back but let's not ask too much of Verizon or they might give us timely updates.

nscian12 said:
With GPS off, Sleep mode on, and NO BATTERY HELPER APPS (Battery guru was diminishing my battery life) I got a record breaking (for me) 4% loss in battery life during my 8 hour night's sleep, not bad if I do say so myself, after that my battery has been a lot better. I wish Verizon would give us HTC's battery saving software back but let's not ask too much of Verizon or they might give us timely updates.
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Click to collapse
Glad to hear this!!
those battery saving apps are so pointless IMHO, it's just another app and if coded incorrectly will do exactly what it did to you, destroy your battery that is working fine. very happy you can now enjoy your phone the way was designed to be!

andybones said:
Glad to hear this!!
those battery saving apps are so pointless IMHO, it's just another app and if coded incorrectly will do exactly what it did to you, destroy your battery that is working fine. very happy you can now enjoy your phone the way was designed to be!
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Click to collapse
Thanks! unfortunately I don't root my phones but for now the One does what I need it to perfectly and seamlessly

nscian12 said:
Update: Battery only drained 10% last night with GPS off, Blinkfeed never updates on its own and all social networks are checked off (I don't like my social networks on Blinkfeed) other than that though everything seems to be in check. If anyone else has anyway to improve that 10% let me know (by the way the 10% was drained during 9 hours of constant sleep I went from 77 to 67)
Click to expand...
Click to collapse
Hey..I had the same problem so...first download wakelock detector from play store..after installing jus use your phone like as usual..after 4 to 5 hrs or right before you charge your phone, open the wakelock app and check what's waking up your phone during sleep..for everyone it seems the battery is drained by Google services ..the main culprit being the location services.. so switch off the location services in settings..and also in Google maps, go into setting and then into Google location settings and make sure location reporting and location history are disabled, make sure they are unchecked.. that's it..restart the phone..fully charge it and test it out ..and DON'T use any battery saving apps ..and also uninstall wakelocker app after your battery life is back to normal..I'm an average user and I unplug around 9 in da morning and when I come home around 6, I still have 65% left..I don use facebook .. heard even facebook app is major battery drainer....you jus have to tweak and play with settings till you find your desired battery life expectancy cos everyone uses their phone differently..and we all have different apps so the main thing is to find out what's eating the phone battery most...I'm just pleased with my decision in picking HTC ONE over galaxy S4

similar problem here....google services is killing my battery (relatively). location is part of it, but google hangouts is also going crazy (watchdog alerts me to excessive usage....over 50%, but hangouts was at 100%)
i was spoiled on my g-nex, where i left wifi, bluetooth, and GPS on 24/7 and could easily go 24 hours. now i'm lucky to get 12 (with about 1 hour of screen on time).
I'm hoping things will sort out, device is only about a week old, but google optimized location usage (iirc) such that it isn't supposed to constantly ping and kill battery. we shall see, i guess.

I'm not sure what the problem could be but I'm just gonna say that yesterday I got around 18 hours of battery life with over 5 hours screen on time which I consider awesome battery life.
I'm stock, so it's definitely possible to get good battery life.

10 percent overnight? Thats not that great but not horrible. My dna is running carbon (android 4.3) I use tasker to turn off autosync and data/wifi and put it on silent at whatever set time I make it. My phone drains about 5 percent max overnight, usually a lot less.

anilpalepu said:
Hey..I had the same problem so...first download wakelock detector from play store..after installing jus use your phone like as usual..after 4 to 5 hrs or right before you charge your phone, open the wakelock app and check what's waking up your phone during sleep..for everyone it seems the battery is drained by Google services ..the main culprit being the location services.. so switch off the location services in settings..and also in Google maps, go into setting and then into Google location settings and make sure location reporting and location history are disabled, make sure they are unchecked.. that's it..restart the phone..fully charge it and test it out ..and DON'T use any battery saving apps ..and also uninstall wakelocker app after your battery life is back to normal..I'm an average user and I unplug around 9 in da morning and when I come home around 6, I still have 65% left..I don use facebook .. heard even facebook app is major battery drainer....you jus have to tweak and play with settings till you find your desired battery life expectancy cos everyone uses their phone differently..and we all have different apps so the main thing is to find out what's eating the phone battery most...I'm just pleased with my decision in picking HTC ONE over galaxy S4
Click to expand...
Click to collapse
you can turn off updates in facebook and its not bad, but yeah if you have autoupdate on, it can kill the battery.
as far as the OP, I don't get why you don't charge you phone while you are sleeping. Seems like the perfect time.

Turning GPS off shouldn't affect your battery life. If you're not using your phone, the phone isn't going to use the GPS for anything. So it shouldn't be using your battery. The culprit is usually an app that is wakelocking your phone. So you need to find which app it is that constantly wakes your phone from deep sleep. Turning off autosync would help a bit if you are really paranoid. The big thing that hurts our battery when the screen is off, is the LTE radio, but most people are connected to WiFi when they sleep so it's not a big deal.
Just an FYI, turning off GPS has been ineffective since 2.2 Froyo. When Gingerbread 2.3 was released like 2+ years ago, it allowed for the GPS to only be used when an app called for it to be used. Otherwise GPS will not do anything unless you pull up an app that calls it to do something.

Why would having WiFi turned on kill my battery?

I have a Verizon G4 that is not getting the great battery life many speak of. I've tried a lot of things...only syncing the bare minimum of stuff (gmail, calendar, contacts), running Lux for auto brightness, used Access lock to turn off most all permissions in most all my apps, disabled/turned off most LG and Verizon bloat, and still I end up getting only 6 to 8 hours before the 15% battery warning, with 30 to 40 minutes screen time (I've been scared to use it more). GSam shows nothing eating up my battery except for Android System, which is typically using 35% to 60%, with all other apps showing minimal usage. My cell signal is strong everywhere I am, as is my WiFi signal.
So, today, on a whim, I decided to turn off WiFi when I got up and unplugged. Now after 8 hours on with 1 hour screen time, I've got 70% battery left and Android System has only used 17%. I consider this GREAT! Ultimately though, I need to get WiFi back on due to data restrictions.
Why would using WiFi be killing my battery? I did notice the day before that, even though I have "Allow WiFi scanning" un-checked, my WiFi screen was showing "searching" every 10 seconds...forever. That seems very battery hog-atious, but I've been told that it's normal (even though it doesn't seem normal to me).
Does anyone know why WiFi is killing my battery or if there is any troubleshooting/testing I can do?

Wifi can be a hog as it is constantly searching for available and open wifi signals. Depending on settings, even while the screen is off it is pinging around looking for open signals. That can kill a battery. In the past, we have had mods to reduce the time between checks from say every 10 second to every minute.
As a rule of thumb I NEVER run wifi unless I am using it. Same with Location or BT for that matter. Hogs always looking for signals.

Disable Wifi Scanning in advanced wifi settings.... I would also turn off google now and limit syncing of google stuff.. I actually have auto-sync off...

A LOT of it can also have to do with the particular Wi-Fi source. At my work, signal is strong, but there's something about it that drains my battery about fifteen percent per hour, even when not in use. And this is across my current g4 as well as my galaxy s4 and s5. Once I get home and connect to my home Wi-Fi, I regularly lose as little as between 0 to 1% over 6 to 7 hours overnight while I sleep. I've started using my laptop (which also uses the work Wi-Fi, but remains plugged in) as an ad hoc Wi-Fi source to which I connect my phone, and that drops my battery drain to about 3% an hour.
Edit* I also leave absolutely everything syncing all the time. Regardless, I lose extraordinarily little (~1% overnight) on home Wi-Fi.

Battery life

I am suprised, there still is no battery life thread.
People must be very happy with their battery lifes or nobody is buying this tablet
I do have one big issue with battery life.
WIFI is the biggest battery hog, using 2-3 times more battery than the screen.
For 3 hours WIFI roughly 1400mAh.
So I only manage like 5 hours of SOT.
Btw. I have set WIFI to be disabled, when the screen is off.
Any suggestions?

I haven't had mine off charge long enough to really be able to comment about this yet but I can't complain with it so far.

Mine seems good so far. Had one freeze as you can see. 33% left.

bill3508 said:
Mine seems good so far. Had one freeze as you can see. 33% left.
Click to expand...
Click to collapse
Still, I think it is strange (as seen in your screen shots), that WIFI accounts for almost half of your battery usage. And 5+ hours SOT is only 6%?
Could you be so kind and post the screen for wifi too, so we can see the "computed power use"?
When looking at my phone, wifi is at 52 mAh power use over an 18 hour period, on this tablet it is 2700 mAh for 10 hours.
An alarming discrepancy.
Or am I missing something?

supersquishy said:
Still, I think it is strange (as seen in your screen shots), that WIFI accounts for almost half of your battery usage. And 5+ hours SOT is only 6%?
Could you be so kind and post the screen for wifi too, so we can see the "computed power use"?
When looking at my phone, wifi is at 52 mAh power use over an 18 hour period, on this tablet it is 2700 mAh for 10 hours.
An alarming discrepancy.
Or am I missing something?
Click to expand...
Click to collapse
Here you go. I'm guessing screen is only 6% because the tablet has been up now for 4 days, so 6 hours is a small portion of the activity.

supersquishy said:
I am suprised, there still is no battery life thread.
People must be very happy with their battery lifes or nobody is buying this tablet
I do have one big issue with battery life.
WIFI is the biggest battery hog, using 2-3 times more battery than the screen.
For 3 hours WIFI roughly 1400mAh.
So I only manage like 5 hours of SOT.
Btw. I have set WIFI to be disabled, when the screen is off.
Any suggestions?
Click to expand...
Click to collapse
Doesnt Wifi use more battery when its connecting and reconnecting with it disabled when the screen is off?

ZiggSVO said:
Doesnt Wifi use more battery when its connecting and reconnecting with it disabled when the screen is off?
Click to expand...
Click to collapse
I really don't know. You may be right.
I guess the high wifi in battery stats is a reporting error / miscalculation. I have wiped the cache partition in recovery (to fix my ambient light sensor) and ever since wifi is at the bottom of my battery list.
And I did not get any better SOT, so there could not have been any real battery drain from wifi even when it held the top spot in the stats.
Still disappointed with only 4-5h SOT.
Thanks everybody for helping out.

ZiggSVO said:
Doesnt Wifi use more battery when its connecting and reconnecting with it disabled when the screen is off?
Click to expand...
Click to collapse
No its still going to use far less unless your picking it up every 30 seconds or so.

bill3508 said:
No its still going to use far less unless your picking it up every 30 seconds or so.
Click to expand...
Click to collapse
my understanding of how android has utilized the wifi sleep policy is that its best to leave wifi always on when sleep. It will use more battery to reconnect to the wifi network when it is woken up and disconnect when sleeping.
Any sources to support your theory? I'd like to read up on it more.
Info I've always followed. This is from 2011 as well:
"This tip is one that seems counter-intuitive, but you can save a lot of wear and tear on your Android phone's battery if you tell it to keep the Wifi radio turned on and connected while the phone is sleeping. Your phone needs a lot of juice to keep pinging those cell towers, and even more to transmit data to and from them. Wifi radios use much less power because of their design, and they don't have to keep searching for a better access point. It's the way cellular data communication was designed, and it's a necessary evil.
But what if you're spending all day (or all evening) in one place, connected to Wifi? If you tell your phone to shut off Wifi when idle, it bounces back to cellular data (be it 2G, 3G, or 4G) and starts sucking down the electrons again when the screen shuts off. That's no good, and easy to fix:
Open the advanced Wifi settings by pressing the menu button, then Settings, Wireless & networks, Wi-Fi settings, and tapping the menu button again. You'll have a choice to either Scan, or go Advanced -- go Advanced.
Tap the Wi-Fi sleep policy entry, and you'll get a pop up dialog with the choices you see in the picture above. Choose Never.
Now even when your phone goes into standby mode, you'll stay connected to Wifi and be able to get mail and messages without turning the cell radio back on and trouncing your battery life. And for the times when you're not in an area with a Wifi connection, just shut Wifi off, either through the menu or with a handy toggle widget. Your battery will thank you for it."

ZiggSVO said:
my understanding of how android has utilized the wifi sleep policy is that its best to leave wifi always on when sleep. It will use more battery to reconnect to the wifi network when it is woken up and disconnect when sleeping.
Any sources to support your theory? I'd like to read up on it more.
Info I've always followed. This is from 2011 as well:
"This tip is one that seems counter-intuitive, but you can save a lot of wear and tear on your Android phone's battery if you tell it to keep the Wifi radio turned on and connected while the phone is sleeping. Your phone needs a lot of juice to keep pinging those cell towers, and even more to transmit data to and from them. Wifi radios use much less power because of their design, and they don't have to keep searching for a better access point. It's the way cellular data communication was designed, and it's a necessary evil.
But what if you're spending all day (or all evening) in one place, connected to Wifi? If you tell your phone to shut off Wifi when idle, it bounces back to cellular data (be it 2G, 3G, or 4G) and starts sucking down the electrons again when the screen shuts off. That's no good, and easy to fix:
Open the advanced Wifi settings by pressing the menu button, then Settings, Wireless & networks, Wi-Fi settings, and tapping the menu button again. You'll have a choice to either Scan, or go Advanced -- go Advanced.
Tap the Wi-Fi sleep policy entry, and you'll get a pop up dialog with the choices you see in the picture above. Choose Never.
Now even when your phone goes into standby mode, you'll stay connected to Wifi and be able to get mail and messages without turning the cell radio back on and trouncing your battery life. And for the times when you're not in an area with a Wifi connection, just shut Wifi off, either through the menu or with a handy toggle widget. Your battery will thank you for it."
Click to expand...
Click to collapse
I know that leaving WiFi on runs your battery down on any device when its connected and it takes all of 2-3 seconds to connect. No reason to leave it on full time when your not using it. Also, the device is continuously checking and sending small amounts of data to maintain that connection.
Were talking about the pixel here and not a cellular device.

Pretty happy with the C.

I haven't really payed attention to how long this device lasts, I use it pretty casually so it lasts me up to a week. I have used it to stream movies and it has lasted me the whole day (8 hours) watching movies with about 30% left. Compared to other tablets I've had including the nexus 9 this one blows them all away. My old nexus 9 would die after a few episodes (about an hour)
Sent from my iPhone using Tapatalk

I streamed a good 6 hours of a live feed on battery and the device used around 50%, can not complain with the battery life at all with this device

bill3508 said:
Pretty happy with the C.
Click to expand...
Click to collapse
Was that with bluetooth (and keyboard) on?

Ves said:
Was that with bluetooth (and keyboard) on?
Click to expand...
Click to collapse
No, just WiFi, don't have a keyboard.

As a heads up, there appears to be a WiFi issue with MM itself. I'm seeing the same issue on my Nexus 7 2013 running a MM ROM, and I found a thread online talking about it...maybe from the Android Central forums or something, I can't remember now. People seem to be unsure as to whether or not WiFi is actually causing a battery drain, or if it's just reporting incorrectly. But at least on my N7, the battery can drop 40-50% in one day while on standby, and when I have WiFi set to Off when it's sleeping. And I used to get DAYS of standby time before going to MM.
Edit: Here's an XDA thread about it: http://forum.xda-developers.com/google-nexus-5/general/guys-call-wifi-battery-drain-6-0-t3219870

I had the same issue with WiFi battery bug on the nexus 5. Fixed it via router by turning off the auto disconnect (the option where router decides if a device can connect based on signal strength) on both 2ghz and 5ghz. After this the Wifi went back down to the bottom of the battery list. Long shot, and most likely not even related, but hope it helps anyone.
On a Asus rt router.

Wi-Fi won't shut off, and it's by far my largest battery user.

I've got a brand new unlocked Moto Z play with the Offgrid battery mod. This morning I was disappointed to see my wifi, despite being disabled, had nearly drained my battery mod. I have the wifi configured to only maintain a connection while asleep and plugged in. The toggle for background location via wifi is absent from the advanced wifi menu.
Why is my wifi constantly on, despite it being toggled off?
I've attached a screen shot of the battery screen.
Edit: found the wifi scanning toggle in locations. I've just switched that off.

fourpointsix said:
I've got a brand new unlocked Moto Z play with the Offgrid battery mod. This morning I was disappointed to see my wifi, despite being disabled, had nearly drained my battery mod. I have the wifi configured to only maintain a connection while asleep and plugged in. The toggle for background location via wifi is absent from the advanced wifi menu.
Why is my wifi constantly on, despite it being toggled off?
I've attached a screen shot of the battery screen.
Edit: found the wifi scanning toggle in locations. I've just switched that off.
Click to expand...
Click to collapse
That's strange. Android Marshmallow comes with Doze functionality, and if the user is not using or moving the phone, it cuts down all background app activity that may eventually drain your phone, thus preserving your battery. You'll still receive notification about emails, and messages in social apps, as they're considered priority, if I'm not mistaken.
I'd say the source of your mod losing battery is your cellular reception. By the print you've posted, the Cellular Network Signal bar is most of the time red, orange or yellow. Poor cellular coverage eats up your battery.

I thank you for saving me the trouble of creating this thread, also did turning off the wifi scanning help?

keep wifi during sleep?

Wi-Fi has been switched off most of the day, wifi location scanning is disabled, and wifi connections while asleep are set to never. Still, it's almost ALWAYS on. Even when my ATT connection is strong it's still sucking down my battery. Wi-Fi remains my largest drain. Larger than cell standby, play services, and the screen.
Edit, looking at my images again, it appears my Z Play is treating the battery mod as a charger. Once the main battery drops to 80% and it switches to the mod battery, the wifi never turns off (despite my settings).

I also have similar problem with my moto z play. I haven't used wifi but still showing top ahead of others. Pls help to resolve this issue.

I had a Moto X Play before for a good while. this problem also showed up there (on Marshmallow as well), but I did find out my battery did not actually get drained, it was a reporting error in Android.
I am not sure if that is the case here with you, is the total battery life definitely lower or is it hard to tell?

Battery is still good but it could be better without the wifi drain. Mine is also more than the total energy the screen consumes and I have battery saver on with wifi location scanning off and wifi on only while plugged in. Not sure what would cause this.

Well, this is interesting. Flew to Boston today around 8:30, and as you can see, toggling airplane mode for the relatively short duration of my flight seems to have fixed my wifi drain. Although the phone did reboot in my pocket around 1530. At the time of this screenshot my internal battery is at 80%, and the battery mod is at 55% with only ~2.5 hours screen on time.

Out of curiosity, when you go into settings>location>3 dot menu>scanning, is wifi scanning turned on or off? Not sure about exact menu location as I don't have a Moto Z play, so working off a custom ROM on my Moto E2. Not sure if it would make a difference, but....

Wi-Fi location scanning is disabled.

Interesting, 24 hours after my flight (both legs visible in the chart) I'm showing no more wifi drain. This is with ~3.75 hours SOT. I am disappointed to see the Offgrid mod lost ~30% over night though. I'll still easily get 2 full days out of one charge, but I was hoping for 3-4. Hopefully Nougat's improved doze helps.

I am thinking my phone is also suffering from the same issue. Take look at my other post:
http://forum.xda-developers.com/showpost.php?p=69486349&postcount=77

Mine is even worse. Even when i activate the airplane mode, wifi does not turn off. It is open literally 24 hours. Seems like it drains the battery but I still have 9-10 Hours of SOT, depending on usage this can go up to 13-14 hours.

I fixed mine by following this:
http://androiding.how/how-to-fix-wifi-battery-drain-on-marshmallow/

emailrob said:
I fixed mine by following this:
http://androiding.how/how-to-fix-wifi-battery-drain-on-marshmallow/
Click to expand...
Click to collapse
Didn't work for me, but I stopped caring. I computed total power usage, wifi does not seem to have that portion

Guys, you must confirm if the WiFi actually drains that amount of power. 8/10 times it is a reporting error in Marshmallow, experienced it myself as well. Gsam battery monitor could tell you more.

This solution is for the MotoZ, a similar issue, maybe it could help us a little
http://forum.xda-developers.com/moto-z/help/extreme-wifi-battery-drain-solution-t3476579

Horrible Battery life on Pixel 2 XL (Pie) (6%/H Drain)

I'm a really light user. I lost a little less than 2% every hour. Basically I use it as a purely communication device. Mostly check facebook messenger, my emails, and occasionally, browse facebook, reddit, 9gag or watch a short youtube video. I stay up about 16 hours on average and at the end of the day, I was regularly around 80%. If I left the phone unplugged overnight while I slept, I only lose about 6% over 8 hours. I was really happy with the battery life. I could very easily see 3 full days out of my phone off a single charge. This was before the Pie update. I tried both the Beta and the Stable once it released, and my battery life has suffered severely. I'm losing 6% every hour, even with the screen off the entire time. At the end of the day, my phone is in the red and has already turned on power saving mode. Android Pie has killed my Pixel 2 XL's battery. I gave it 2 weeks to "learn" my usage habits, but ultimately, I factory reset and even went back to 8.1, but I still suffer from battery issues. Battery usage gives no hint to the culprit. My phone has been unplugged for 7 hours, with 45 minutes of screen on time, and at 54% remaining battery life. Screen On time is the highest battery drain according to the system battery stats. I didn't have this issue until I installed Android Pie Stable.
I have no idea what could be going on, but could really use some help with this.
TL;DR: From 2% to 6% per hour battery drain on Pie. Reverted to Oreo and FR but still an issue. Advice?

Did you check if the WiFi scanning is turned ON? Settings --> Location --> Scanning
I feel its the only issue, nothing should drain your P2XL crazy if apps remaining constant factory reset.
-- personal experience.

I also use it very similarly to you and easily get 2 days with a single charge on Pie. During night my device drains 1 or 2 % only (wi-fi, bluetooth and 4g on), but I have wi-fi scanning off. Google location services are on (including Location Accuracy on). "At a Glance" is turned off but still using stock Pixel Launcher. No hacks/mods installed.

Same except I have at a glance enabled. I disable it 6 hours ago to test and didn't affect battery drain at all. Still losing 6% every hour. Location and scanning settings default except connect to open WiFi is enabled. Right now testing if connect to open WiFi and Bluetooth WiFi location improvement affecting battery drain.

Testing that now. Will report in a day. Heading to bed now. Gn

Does the phone charge all the way to 100%? Does the phone ever turn off by itself when low on battery ~10%? Install and run Accubattery. After a few charging cycles you will get a very close approximation of your battery's remaining capacity as compared with new in mAh. Battery capacity will be located under the health tab. The more charge cycles you monitor, the more accurate it gets, but it will zero in on a number pretty quickly after the first 2-3 charges. Could be the battery... stranger things have happened. This also assumes the user has fully wiped the phone several times going between DP's, Pie and reverting to Oreo.

Does the phone charge all the way to 100%?
- Yes
Does the phone ever turn off by itself when low on battery ~10%?
- Honestly, I don't know. I never let my battery get that low.
Install and run Accubattery. After a few charging cycles you will get a very close approximation of your battery's remaining capacity as compared with new in mAh. Battery capacity will be located under the health tab. The more charge cycles you monitor, the more accurate it gets, but it will zero in on a number pretty quickly after the first 2-3 charges. Could be the battery... stranger things have happened.
- Will do
This also assumes the user has fully wiped the phone several times going between DP's, Pie and reverting to Oreo.
- You assume correctly.

Didn't seem to help.

Didn't seem to help at all.

Video of battery stats and settings.
https://drive.google.com/open?id=164lujTgzt6hihESdFlkb0AdQdOFGiYtX

I changed some settings and now I'm getting 17mAh drain. Fixed.

The biggest battery sucker for me was having Auto-connect to open wifi enabled and fixing stuck sync tasks. It was preventing my phone from sleeping.

Great to know you were able to stop the draining, I think it might be of great help to other P2XL owners to know what were the settings you changed that fixed the issue.

What settings did you change?

I am having the same issue. I would be interested in hearing your changes as well. Thank you

Download and install Accubattery to monitor your mAh usage. Make sure you check your deep sleep percentage. By the sound of things, your phone is running hot when idle, so it's not sleeping like it should be. You can install Wakelock Detector Lite to see which apps are keeping your phone awake. Once you find out what apps are draining your battery, use the System battery manager in Settings to restrict battery usage for those apps. If that doesn't help, then uninstall the app (unless it is necessary to you). If an app isn't keeping your phone awake, then it may be your system settings. Turn off location scanning for wifi and bluetooth (in the GPS section). Turn off Wifi auto-connect to open wifi. Where I live I have pretty weak cellular connection. I opted to disable Mobile data always active in developer options (Go to about phone, and tap the build number 7 times, then enter your device password). While you are here, you can check Running services in developer options and see what you have running. Also, make sure your accounts aren't stuck trying to sync. If they are, cancel the sync and restart it. Depending on how far you are backlogged, this can take a while. If the sync still gets stuck, try removing and re-adding the account that is getting stuck.
After I restricted/uninstalled the misbehaving applications and tuned the device settings, I'm getting great standby time on my Pixel 2 XL. If I close all my apps before putting the phone back in my pocket, according to accubattery, I'm losing 15mA/h or about 0.4%/h. If I charged my phone to 100%, then unplugged it without using it at all, it would take 10 days for the battery to run out. It's pretty good. As someone who primarily uses their phone as a communication device and research tool, I'm a pretty lightweight user.

+1 What settings did you change?

Yes, please, don't keep us in suspense!
Just got a used one so trying to learn all about getting optimum performance.