Does anyone have any input or advice on how to check which parts of the Android system, (as shown in the battery under settings) is using so much of my battery. It's pegged at about 45%, where the screen, (what used to be the biggest hog on the gs6), is only using 15% on the Gs7. I will give any other info that could be helpful if needed! I had turned on the process monitor to look for any rogue processes for a couple of days but nothing had seemed of any interest.
If anyone has a tool that could check deeper into the system of which processes are draining the most battery that would be really helpful.
Officialkwade said:
Does anyone have any input or advice on how to check which parts of the Android system, (as shown in the battery under settings) is using so much of my battery. It's pegged at about 45%, where the screen, (what used to be the biggest hog on the gs6), is only using 15% on the Gs7. I will give any other info that could be helpful if needed! I had turned on the process monitor to look for any rogue processes for a couple of days but nothing had seemed of any interest.
If anyone has a tool that could check deeper into the system of which processes are draining the most battery that would be really helpful.
Click to expand...
Click to collapse
You might wanna try GSam Battery Monitor.
I have the same issue... No clue as to what causes it.
Edit: I found that the problem was with Wi-Fi only. I restarted the router, deleted the settings on the phone and reconnected to Wi-Fi. Now the phone gets into deep sleep again and the Android system usage is much less. Happy for now...
Sent from my SM-G930F using XDA-Developers mobile app
I did have this trouble. I turned off "Keep wifi on" and it works its wonders.
Related
Hello,
I'm a first time poster looking for a little help. I've had my Verizon SIII for about a week now and almost everything about the phone I have loved with the exception of the battery life. Given the 2100mah battery I was expecting much more. I tend to be a fairly light user throughout the day at work, I have the screen brightness turned down, all data is off, and I really only am using it for texting, maybe a little bit of gaming. I have found that if I unplug at about 8am by about 6 or 7pm the battery will be nearly completely drained.
Noticing that this seemed to be a fairly common problem I started doing some research to determine the source of this. First, by looking at the battery stats I observed the same problem that many others observe, a heavy drain in standby mode.
ttp://i.imgur.com/2drJy.png (since I'm a first time poster I can't add external links, please just add an H to the beginning of the url)
So going off of this I started trying to determine the cause of this drain in standby mode. I should also mention that at times the phone does seem to get warm in the bottom left region of the back of the phone. I had read one tutorial explaining about wakelocks so I decided to check that out. I downloaded GSam Battery and CPU Spy to see if something was preventing my phone from entering standby mode properly. However my phone was entering deep sleep as shown below, so this confused me a bit. But clearly there is some issue visible in the standby mode of my phone, sometimes the battery will drain ridiculously fast (as high as 1% every 5 - 10 minutes). And keep in mind that this is while virtually everything, data included, is disabled. So that eliminates the possibility of it simply having to search for a signal in a weak area.
ttp://i.imgur.com/pekXb.png
ttp://i.imgur.com/xauHF.png
ttp://i.imgur.com/2drJy.png
Basically I'm having a tough time getting to the root cause of this problem. I feel like there's some little software issue in there that is draining it. But I've been pretty smart about the apps that I've downloaded, I've stuck with only very common and popular ones. So would anybody have any clue to how I could identify and address the source of my battery drain?
Thanks
mmisley3 said:
Hello,
I'm a first time poster looking for a little help. I've had my Verizon SIII for about a week now and almost everything about the phone I have loved with the exception of the battery life. Given the 2100mah battery I was expecting much more. I tend to be a fairly light user throughout the day at work, I have the screen brightness turned down, all data is off, and I really only am using it for texting, maybe a little bit of gaming. I have found that if I unplug at about 8am by about 6 or 7pm the battery will be nearly completely drained.
Noticing that this seemed to be a fairly common problem I started doing some research to determine the source of this. First, by looking at the battery stats I observed the same problem that many others observe, a heavy drain in standby mode.
ttp://i.imgur.com/2drJy.png (since I'm a first time poster I can't add external links, please just add an H to the beginning of the url)
So going off of this I started trying to determine the cause of this drain in standby mode. I should also mention that at times the phone does seem to get warm in the bottom left region of the back of the phone. I had read one tutorial explaining about wakelocks so I decided to check that out. I downloaded GSam Battery and CPU Spy to see if something was preventing my phone from entering standby mode properly. However my phone was entering deep sleep as shown below, so this confused me a bit. But clearly there is some issue visible in the standby mode of my phone, sometimes the battery will drain ridiculously fast (as high as 1% every 5 - 10 minutes). And keep in mind that this is while virtually everything, data included, is disabled. So that eliminates the possibility of it simply having to search for a signal in a weak area.
ttp://i.imgur.com/pekXb.png
ttp://i.imgur.com/xauHF.png
ttp://i.imgur.com/2drJy.png
Basically I'm having a tough time getting to the root cause of this problem. I feel like there's some little software issue in there that is draining it. But I've been pretty smart about the apps that I've downloaded, I've stuck with only very common and popular ones. So would anybody have any clue to how I could identify and address the source of my battery drain?
Thanks
Click to expand...
Click to collapse
This may be worth a try http://forum.xda-developers.com/showthread.php?t=1732722
or this http://androidapplikation.info/2012/07/cpu-sleeper-2-4-apk-for-android-free-download/
Hope it helps
You don't have to thank me there is a button for that
Download and try Watchdog Lite. It's a really good monitor for finding out which apps are acting up.
This doesn't exactly answer your question, but can help with your problem. There are programs that can help to drastically improve battery life by turning off data (3g\4g) while the screen is off. This can double your battery life or more, especially for lite/moderate users. Most of these programs work by turning on the data 1 minute out of every 15 the screen is off. That way you still get email, and notifications. You still get txt and phone real time, as they do not rely on data. When you turn the screen on data is turned on, when you actually would want to use it. Especially in 4g areas this really saves battery, as 4g is a battery hog.
Battery Defender is my favorite. I feel like I should be paid for this advertisement...
Do you have BATTERY SAVER option ENABLED in settings? That makes a huge difference for me.
It sounds like you are still stock, but I used the Root66 image and after that started having huge battery drain. I did a factory reset to no avail, so then moved to Synergy Rom. Since then, I've had outstanding battery life! not sure if you were thinking about going this route, but it has worked for me. Synergy is debloated so I assumed Verizon crap to be the culprit.
The images I saw were all at 100% battery. Those are not very helpful. A shot of your battery stats at the end of the day would be a lot more useful.
Please note that Cell Standby reports incorrectly at the moment on the S3. Unless you do the fix linked above, it will nearly always be at the top, but it does not actually drain that much battery, it is simply a reporting issue.
Hey guys,
A common question: My Nexus 5 seems to suffer from energy drainage, as I'm not getting the Screen on Time I'm used to. Ever since I got the phone, I've always got about 2:45 - 3:15 hours of Screen on time and in the past months, that hasn't changed, until the last few weeks, as I'm getting a max up to 2 hours of screen on time, often up to 1 and half hour..
Not much has changed. Same usage patterns, not really any new apps that I regularly use and screen brightness (50%), Wifi (24/7 on and won't turn off on sleep, 90% of the day on WiFi), 3G (normal use), GPS (off), bluetooth (off) I use on normal base.
Also the usage graph that shows how many % per app is used hasn't changed ever since. 25% screen, 15% android OS and all others a few percent.
So I'm unsure what app/thing is the boogyman, or how I can check what is; hopefully any of you can help me!
I wouldn't mind a factory reset, but I'd prefer trying to use on-device checks before I perform a factory reset.
Thanks!
P.s. I'm not rooted (yet, still unsure whether to or not. Kinda happy with the 3 hours I'm used to. Not interested in a different rom anyway), so no answers that require being rooted. Thanks!
Blackvibes said:
Hey guys,
A common question: My Nexus 5 seems to suffer from energy drainage, as I'm not getting the Screen on Time I'm used to. Ever since I got the phone, I've always got about 2:45 - 3:15 hours of Screen on time and in the past months, that hasn't changed, until the last few weeks, as I'm getting a max up to 2 hours of screen on time, often up to 1 and half hour..
Not much has changed. Same usage patterns, not really any new apps that I regularly use and screen brightness (50%), Wifi (24/7 on and won't turn off on sleep, 90% of the day on WiFi), 3G (normal use), GPS (off), bluetooth (off) I use on normal base.
Also the usage graph that shows how many % per app is used hasn't changed ever since. 25% screen, 15% android OS and all others a few percent.
So I'm unsure what app/thing is the boogyman, or how I can check what is; hopefully any of you can help me!
I wouldn't mind a factory reset, but I'd prefer trying to use on-device checks before I perform a factory reset.
Thanks!
Click to expand...
Click to collapse
If you're rooted you're going to want to use Better Battery Stats. I believe there's a version free to XDA members, somewhere. It'll give you extremely detailed information about which wakelocks are eating up your battery. There are a ton of threads on here (my favorite is in the Samsung Skyrocket forum) which explain the various wakelocks and how to minimize or get rid of them. If you're not rooted, I'm not sure what would be able to help.
mrfeuss said:
If you're rooted you're going to want to use Better Battery Stats. I believe there's a version free to XDA members, somewhere. It'll give you extremely detailed information about which wakelocks are eating up your battery. There are a ton of threads on here (my favorite is in the Samsung Skyrocket forum) which explain the various wakelocks and how to minimize or get rid of them. If you're not rooted, I'm not sure what would be able to help.
Click to expand...
Click to collapse
Not rooted - Updated the OP. Thanks anyway!
Do you have anything running as a service in Settings> Apps> Running that wasn't before? It might be the latest Google Search or Play Services updates.
Could also be strength of signal or if you were traveling more than usual. Any number of things, not much we can do without BBS or Gsam stats which would require root for meaningful results. Otherwise you could screenshot your default battery stats including the graph, screen on time, and detailed stats for any apps using more than 5%.
Any links to the better battery stats thread? I'm having similar issues. Running the latests Beanstalk
You should check social apps setting for repeating sync; Facebook, twitter or skype..
stevenschemers said:
Any links to the better battery stats thread? I'm having similar issues. Running the latests Beanstalk
Click to expand...
Click to collapse
Google betterbatterystats xda
Sent from my SAMSUNG-SGH-I727 using XDA Free mobile app
Without root and gsam or better battery stats.....this thread will just be full of guesses I'm afraid.
Have to see your Wakelocks. Otherwise no one knows the issue. All guesses.
I seem to have a problem with my phone.
I'm running stock 4.4.4 non-rooted. And if I use the gps with any app like Runtastic or Endomondo, after switching the gps off(i use the gps - device only), in remains on(in battery stats). I can't switch it off. No apps are using the gps, and still it's on. I can see it in Battery stats. What's the problem?
If you mean battery stats in Settings, that shows usage since last full charge. It doesn't necessarily mean that it's currently being used.
I mean it keeps showing that it's on altdough its not.
I get all kinds of weird looking stuff reported in my battery stats, including something similar to what you've got. After being nervous about it for a while, I just decided to ignore it. Unplugged the phone this morning, 10 hours ago -- have run the battery down to 93%. NOTHING is using unreasonable amounts of battery -- no matter what my battery stats page shows.
If you are getting reasonable battery life, leave the battery stats feature alone...
moseso said:
I get all kinds of weird looking stuff reported in my battery stats, including something similar to what you've got. After being nervous about it for a while, I just decided to ignore it. Unplugged the phone this morning, 10 hours ago -- have run the battery down to 93%. NOTHING is using unreasonable amounts of battery -- no matter what my battery stats page shows.
If you are getting reasonable battery life, leave the battery stats feature alone...
Click to expand...
Click to collapse
well it's not that normal, I mean..while this is happening, the battery drains like it's really using the gps. will test further to see what's the problem. Maybe some app that i've installed, but i doubt it.
sherbibv said:
I seem to have a problem with my phone.
I'm running stock 4.4.4 non-rooted. And if I use the gps with any app like Runtastic or Endomondo, after switching the gps off(i use the gps - device only), in remains on(in battery stats). I can't switch it off. No apps are using the gps, and still it's on. I can see it in Battery stats. What's the problem?
Click to expand...
Click to collapse
Do you use showbox? It gets stuck holding location often.
Sent from my Nexus 5 using XDA Premium 4 mobile app
Nope.
I recently received an Nvidia Shield and updated it right away to 4.4.2.
Today I noticed that overnight the Android OS was taking up a large portion of the battery life. The Shield's Android OS used 70% of the battery while my Nexus 4 usually only uses 12% or so.
I'm not sure if this is because it's a new install or going to be a persistent problem.
Has anyone found out why this is or have a solution to fix it?
I don't want to disable multitasking. I'm probably also not going to root the device anytime soon just in case this is a real problem and I need to RMA it. I have disabled Wi-Fi when the device sleeps.
Actually, now that I'm looking at the screenshots again, it seems the battery stats aren't reporting the other apps I was using. Maybe it all got combined into Android OS somehow? I checked my Shield again and the games and apps I was using are shown and the % of Android OS seems to be going down.
I hope this was a fluke, but it'll be a few more days before I know for sure.
It seems it might have just been a weird glitch in the way the battery stats was shown.
Today I checked my Shield and it only used 3% battery life overnight with Android OS only using 9%. All the other apps also stayed visible on the list of apps.
Last night I turned on "Keep Wi-Fi on during sleep" again since it's actually pretty annoying when I'm trying to download something on the Shield and it gets cancelled when it goes to sleep.
I had 30% battery life when I went to bed and the Android OS battery usage was a low 12%.
I woke up with the Shield having 30% battery life still, but the Android OS battery usage shot up from 12% to 45%.
I went out for 30min and came back and the Shield had 32% battery life.
I used it for a couple of minutes and battery life dropped to 25%.
I have no idea what the heck is going on with the battery stats. I'm probably going to see what happens tonight and if the Android OS starts to get really high again I'll then turn off "Keep Wi-Fi on during sleep" for a few nights to see if that's really what's causing it.
Outrager;541903Last night I turned on "Keep Wi-Fi on during sleep" again since it's actually pretty annoying when I'm trying to download something on the Shield and it gets cancelled when it goes to sleep.
I had 30% battery life when I went to bed and the Android OS battery usage was a low 12%.
I woke up with the Shield having 30% battery life still said:
No live wallpaper? Or gpu rendering in dev options?
Click to expand...
Click to collapse
mudflap2.0 said:
No live wallpaper? Or gpu rendering in dev options?
Click to expand...
Click to collapse
Using the stock wallpaper. I think it's just an image.
Force GPU rendering is off. All the Dev options are default.
I'm interested to know if this ever gets resolved. I'm experiencing the same thing, just a tad more extreme. Android OS taking 95% battery. Been on the wallcharger more than a day, i wake it up and its at 45% charge. Stock, non-rooted, no Dev options enabled. I have a sneaking suspicion its related to Google Play services, but have no way of knowing.
Sent from my Nexus 5 using Tapatalk
brianj1970 said:
I'm interested to know if this ever gets resolved. I'm experiencing the same thing, just a tad more extreme. Android OS taking 95% battery. Been on the wallcharger more than a day, i wake it up and its at 45% charge. Stock, non-rooted, no Dev options enabled. I have a sneaking suspicion its related to Google Play services, but have no way of knowing.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
So after doing a factory reset and getting the same results I finally decided to just unlock my bootloader and root the Shield. I did contact my 3rd party insurance company first to make sure they would still cover any hardware faults if I did that.
Anyway, unlocking the bootloader meant a factory reset too. Well instead of Android OS taking up the majority % of the battery life it became Wi-Fi that was doing it.
I thought it might be the battery so I ran it down to 0% then while charging it back up I just said, "Screw it," and started fresh using the Recovery OS Image from the Nvidia site.
SO FAR, it seems to be much more normal in terms of the battery stats.
What's weird is Android OS and Android System have swapped positions compared to the way my Nexus 4 is.
It'll probably be another day or two when I use the Shield some more before I can make sure it's all better.
Update:
Nevermind.
Overnight Wi-Fi and Android OS shot to the top of the battery usage.
Outrager said:
So after doing a factory reset and getting the same results I finally decided to just unlock my bootloader and root the Shield. I did contact my 3rd party insurance company first to make sure they would still cover any hardware faults if I did that.
Anyway, unlocking the bootloader meant a factory reset too. Well instead of Android OS taking up the majority % of the battery life it became Wi-Fi that was doing it.
I thought it might be the battery so I ran it down to 0% then while charging it back up I just said, "Screw it," and started fresh using the Recovery OS Image from the Nvidia site.
SO FAR, it seems to be much more normal in terms of the battery stats.
What's weird is Android OS and Android System have swapped positions compared to the way my Nexus 4 is.
It'll probably be another day or two when I use the Shield some more before I can make sure it's all better.
Update:
Nevermind.
Overnight Wi-Fi and Android OS shot to the top of the battery usage.
Click to expand...
Click to collapse
Not more than a week and a half ago, I did a factory reset on my Shield, for reasons unrelated. I was running into problems where the thing would randomly reboot in the middle of playing games. I attributed it to issues related to moving games to SD.
After the reset, and re-install of everything it has been running rock solid, it's only past few days this battery drain started being an issue. Last night I went through and unchecked 'show notifications' for any and all downloaded games, not sure if that makes a difference really. The thing sat on the charger an entire night, and in the morning it was still only at 52% charge, Android OS still being the top offender.
I've turned location OFF, and set WIFI to off during sleep. Going to see how the battery looks after a few more hours. If I was more adventurous I'd root, and install a wakelock detector, but I'm just not that motivated. I'm hoping if I ignore it the problem will work itself out eventually. Not sure what to think, none of my other Android tablets or phone are experiencing this phenomenon.
brianj1970 said:
Not more than a week and a half ago, I did a factory reset on my Shield, for reasons unrelated. I was running into problems where the thing would randomly reboot in the middle of playing games. I attributed it to issues related to moving games to SD.
After the reset, and re-install of everything it has been running rock solid, it's only past few days this battery drain started being an issue. Last night I went through and unchecked 'show notifications' for any and all downloaded games, not sure if that makes a difference really. The thing sat on the charger an entire night, and in the morning it was still only at 52% charge, Android OS still being the top offender.
I've turned location OFF, and set WIFI to off during sleep. Going to see how the battery looks after a few more hours. If I was more adventurous I'd root, and install a wakelock detector, but I'm just not that motivated. I'm hoping if I ignore it the problem will work itself out eventually. Not sure what to think, none of my other Android tablets or phone are experiencing this phenomenon.
Click to expand...
Click to collapse
Setting Wi-Fi to turn off during sleep does sort of help keep Wi-Fi battery usage down, but I just find it so inconvenient.
I just rooted and have BetterBatteryStats installed. The Kernel Wakelock category doesn't show anything for some reason and nothing unusual about the Partial Wakelocks.
The only unexplained thing is a Process called migration/0 that has been on for 15h 15m 6s even though the device only shows an uptime of 13h 1m 26s. A quick Google search says, "The migration kernel process distributes workload across CPU cores. You should have one migration process per processor core." so I guess it's normal?
Also, while typing this, my Android OS battery usage shot up to 80% and my Wi-Fi is now at 10% which is still higher than the Screen on usage of 7%.
I also just used ROM Toolbox Pro to freeze all the Nvidia system apps, like NVStats and TegraZone, to see if that will help at all.
I have this feeling that it is Android 4.4.2 that is causing the problems and I hope Nvidia at the very least updates to 4.4.4.
I've been reading some more articles and there are some that point to the external SD card being the culprit of the battery drain.
It seems to be that Media Scanner is trying to constantly scan the external SD card.
I'm not 100% sure if it is the cause because on my side I don't have the Mediaserver using any battery.
The next time I fully charge my Shield I might try removing the MicroSD card to see if that is causing it.
Outrager said:
I've been reading some more articles and there are some that point to the external SD card being the culprit of the battery drain.
It seems to be that Media Scanner is trying to constantly scan the external SD card.
I'm not 100% sure if it is the cause because on my side I don't have the Mediaserver using any battery.
The next time I fully charge my Shield I might try removing the MicroSD card to see if that is causing it.
Click to expand...
Click to collapse
I'm not sure removing the SD card changed anything.
I did notice a process in BetterBatteryStats called migration/0 that is very high usage and I have no idea what it is for or how to stop it.
Okay, so I think I've found the cause of the high Android OS battery usage.
First my solution:
In the Settings -> Accounts -> Google -> (your account)
Leave Sync enabled, but ONLY check "App Data", "Chrome", and "Google Photos Auto Backup". Leave everything else un-checked.
Set Wi-Fi to turn off when the Shield goes to Sleep.
*I haven't bothered to test individual sync option, but those are just the 3 I left checked. You can try it yourself to see which one is the real culprit. My best guess is it is Calendar syncing that is causing the problems.
*Do not just disable Sync. I found that did not help at all. I don't know why.
*I don't know if it's my router or the Shield, but Wi-Fi also uses way too much battery when asleep. I can see that it is going into deep sleep too. Setting Wi-Fi to turn off when the Shield goes to sleep drastically lowers the Wi-Fi battery usage. Fun fact: The Wi-Fi stays on for 20 minutes after you turn off the screen before turning itself off.
After un-checking a bunch of the syncing options my Android OS battery usage went down to 20% for a 20 hour period compared to the 70% or so it was using the day before I did it.
The "migration/0" process no longer shows up at the very top in BetterBatteryStats. If it is showing up, it is <10sec of usage.
After 20 hours, with about 35min of 3D gaming and 40min screen on time, the Android OS battery usage was using 20% with 30m30s of CPU Total. I also spent about 10min transferring files using AirDroid then moving them to the SD card.
The battery life dropped from 100% -> 84% in those 20 hours. I think I would have had battery life closer to the Anandtech review if I was just doing 1 thing consecutively and not gaming then using the Wi-Fi to move files. I might try that one day, but most likely not.
I hope this helps for everyone having the same problem as me.
Outrager said:
Okay, so I think I've found the cause of the high Android OS battery usage.
First my solution:
In the Settings -> Accounts -> Google -> (your account)
Leave Sync enabled, but ONLY check "App Data", "Chrome", and "Google Photos Auto Backup". Leave everything else un-checked.
Set Wi-Fi to turn off when the Shield goes to Sleep.
*I haven't bothered to test individual sync option, but those are just the 3 I left checked. You can try it yourself to see which one is the real culprit. My best guess is it is Calendar syncing that is causing the problems.
*Do not just disable Sync. I found that did not help at all. I don't know why.
Click to expand...
Click to collapse
Thanks for this pointer.
I was also facing significant CPU consumption by the real time kernel process migration/0 on my Googy-Max-1.7.9 kernel.
I turned off the calendar sync and this seems to have fixed the issue. Now I am only syncing App Data, Contacts, Gmail and the others [browser, Calendar, Chrome, Chrome Beta and People details] are off.
Related thread: http://superuser.com/questions/416779/linux-migration-n-high-cpu-consumption
So I recently cracked the screen of my Nexus 5, ended up asking the official LG repairer in Australia to replace the battery with a new genuine one as I thought this was the perfect opportunity.
When I received the phone back I had the 6.0 update waiting for me, did it straight away and I was getting amazing battery life. Over 4 hours of SOT. I was thinking this was a combination of a new battery and Doze.
Anyway, since then my battery life has been terrible. "Android System" just chews up so much battery and my phone is really hot all the time from it. It almost always is using more battery than the screen.
I thought maybe a factory reset would work but it hasn't. I've unlocked the bootloader and rooted the phone and I'm not running BBS. I was wondering if someone could take a look to try and help me figure out what's causing it. How can I go from such fantastic battery life to this in the space of a few days?
Here are some screenshots of how much Android System consumes my battery when I've not long taken it off charge. The phone gets really hot when this happens.
Also here are 2 BBS dumps. As you can see, in one, I get 4 hours of SOT and the Android System wasn't eating battery like it was this time. I don't know what's causing it. Turning Google Now off, location off, WiFi scanning off, 2.4GHz only and mobile data off hasn't changed anything. As you can see 'com.android.phone' seems to be using a lot of battery under Process in BBS. Could this have something to do with it? When 'Android System' wasn't eating battery and I was getting over 4 hours of SOT you can see I was listening to podcasts and using my phone a lot and it was fine. I'm hardly using my phone when 'Android System' is draining battery so I've got no idea why this is happening.
BBS dump with 4 hours of SOT
BBS dump with 'Android System' eating battery
Can anyone see what could be causing this? I've got no idea and it's seriously annoying me now. Any help would be greatly appreciated.
Well the first days i updated to 6.0 i had a similar issue with wifi. A couple of days later and now its exactly the same as yours. I have no clue about what's going on.
Sent from my Nexus 9 using Tapatalk
I wiped the cache partition from recovery when this was happening and turned mobile data off, 'Android System' then stopped draining battery. I think there is an issue with the radio, like the radio active bug in Lollipop. When the drain is there, turning off mobile data doesn't seem to make it go away on its own, the phone it seems needs to be rebooted. Any time the drain is happening, it's once again 'com.android.phone' in processes of BBS that seems to be doing the damage.
Edit: Okay, it still happens with mobile data off. I've got no idea what's causing it.
It seems to happen more when I use Hangouts and specifically send and receive text messages. In one conversation I have about 70,000 SMSes. Could this cause it?