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[Q] Horrible android system battery drain

Im on COS 12 and recently I have been experiencing really bad battery drain by the android system. It has been using 7h of my CPU. How do I fix this?

Go back to cm11s
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Abhinav_Rakesh said:
Go back to cm11s
Sent from Bacon
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Very USEFUL comment (loljk)
@usvimal : Install a battery monitor app like GSAM or BBS and look for culprits under Kernel/Partial wakelocks.
I usually have 59 mins on Android OS CPU usage per charge cycle, so almost 8 hours is a bit much.

davebugyi said:
Very USEFUL comment (loljk)
@usvimal : Install a battery monitor app like GSAM or BBS and look for culprits under Kernel/Partial wakelocks.
I usually have 59 mins on Android OS CPU usage per charge cycle, so almost 8 hours is a bit much.
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Here are the Stats. Can you help me find out what's draining my battery?

usvimal said:
Here are the Stats. Can you help me find out what's draining my battery?
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Strange, but those stats actually look OK, and 5.5%/h with 38% screen on is still OK. Maybe you need to let the information gather further.

usvimal said:
Im on COS 12 and recently I have been experiencing really bad battery drain by the android system. It has been using 7h of my CPU. How do I fix this?
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Try this, it worked for me. Wifi settings seemed to be the problem. Changed the frequency from 'automatic' to '2.4 Ghz only' in the advanced wifi setting.. Now all Normal. I almost returned the phone thinking of a hardware issue.

battery discharge while screen off

I charged it to 100% before going to sleep. When I woke up in the morning, the battery was 82%. I mean srsly wtf ? I have no idea what's going on. This draining issue has started after I've started using oneplus power bank . plz help me. Also there r no wakelocks so that's not an issue.

ronu said:
I charged it to 100% before going to sleep. When I woke up in the morning, the battery was 82%. I mean srsly wtf ? I have no idea what's going on. This draining issue has started after I've started using oneplus power bank . plz help me. Also there r no wakelocks so that's not an issue.
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Post also wakelocks fom GSam Some running app is using up your battery

Here's the app usage screenshot

Here is what I do,
1. Install Battery Monitor Widget from PlayStore.
2. Use the "History" tab in the application to measure the battery drain when idle. The application records the drain every 10 minutes.
I typically have a -6mA drain when the phone is asleep (Google Now running, Location set to "battery saving"). This should give you a good idea on how your phone is behaving.

Gsam sucks, you need to use something like BetterBatteryStats to effectively track down what's causing the wakelock. Get BBS, run the phone normally for a few hours, and then post screenshots of the Other, Partial Wakelocks, and Alarms screens in BBS.
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cramukinc said:
I typically have a -6mA drain when the phone is asleep (Google Now running, Location set to "battery saving").
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Actually "battery saving" location eats more battery, than Device only since it's using WiFi + Cellular instead of GPS. At least it's my experience, that I have a bit less drain on Device Only, than on Battery saving.

After a week of using these apps.. I've found that there are no wakelocks, still the battery drains overnight.
Will the battery recaliberation help?
Or maybe chaning the rom?
I'm on stock rom as of now. Non rooted.
PLease please suggest me something.

ronu said:
After a week of using these apps.. I've found that there are no wakelocks, still the battery drains overnight.
Will the battery recaliberation help?
Or maybe chaning the rom?
I'm on stock rom as of now. Non rooted.
PLease please suggest me something.
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Exactly what apps are you using? Can you post some screenshots of the recorded information?
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Transmitted via Bacon

ronu said:
After a week of using these apps.. I've found that there are no wakelocks, still the battery drains overnight.
Will the battery recaliberation help?
Or maybe chaning the rom?
I'm on stock rom as of now. Non rooted.
PLease please suggest me something.
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I had issues with battery draining when I left my phone somewhere with low signal strength overnight.
Also I experienced battery drains when my I had a slow internet connection. It may be that some applications are trying to sync, but they are unable to due to slow connection. So they try again and again. (I have this issue with K9-Mail).
I would also suggest to check if Google Location Reporting ist switched on. It was also a battery drainer I had a problem with in the past.
So before you start flashing ROMs, make sure this is not related to signal or synchronization problems.

What is causing the battery drain ???
Here r some screenshots
Sent from my A0001 using XDA Free mobile app

Obviously Google+, it tries to sync something, maybe pictures.

Honor 8 battery drain issues

To all suffering from the same, just change the battery and it will be fixed. The battery won't last for over a year if it's been through excessive and rough usage. So change it and enjoy it as good as new.

avi737 said:
To all suffering from the same, just change the battery and it will be fixed. The battery won't last for over a year if it's been through excessive and rough usage. So change it and enjoy it as good as new.
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My Battery Is Pretty Good I Use An App That Disable Services to stop things From Running in the background

SuperSwordSmasher said:
My Battery Is Pretty Good I Use An App That Disable Services to stop things From Running in the background
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what app?

avi737 said:
To all suffering from the same, just change the battery and it will be fixed. The battery won't last for over a year if it's been through excessive and rough usage. So change it and enjoy it as good as new.
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thank you Captain Obvious! :*

robertkarlsen said:
what app?
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The App I Use Is Not In Play Store Anymore, But There Is Another App Called "Service Disabler", But I Warn You, Back Up Device, But Mainly App Data Is The Only Thing You Need To Back Up In Case Bootloop.
Do Not Disable "Power Genius" It Helps Close Background Prcesses
DO NOT DISABLE "com.huawei.securitymgr" OR ELSE YOU WILL GET BOOTLOOP
DO NOT DISABLE "Fused Location" OR YOU WILL GET BOOTLOOP
You Can Disable "imonitor" And Other Services To Save Battery
I Think Thats All Garenteed You Could Save Battery

Actually, the best way to check your device battery is by using an app from Play Store, 'AccuBattery'. After a couple of charging and discharging cycles, it will tell you your battery's current capacity. Mine went down to 1300 mAH only. Replaced the battery and now the capacity is correctly reported as 2973 mAH (pretty close to 3000 mAH).

liPillON said:
thank you Captain Obvious! :*
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You're welcome Private Sarcastic

Guide to debug battery drain due to partial wakelocks

Have you noticed that your phone does not last as long after an os update or just out of the blue? I've faced this issue countless times while changing roms, os versions or even between minor OS updates. After spending a good amount of time researching about possible causes for overnight standby battery drains, partial wakelocks seem to be one of the biggest offenders. The android developer website is a good resource to understand what partial wakelocks are. And as it turns out, you can figure out the app holding the partial wakelock and draining your precious battery without root or any changes to the bootloader/rom. Here we go:
Go to settings > battery and performance (poco f1 on miui) -> power usage ->Tap on the clock on the top right corner -> check if the awake field below the graph is a constant blue line. Or if the device has been awake a lot more than the time screen was on. Other roms also have this graphical view of battery stats under some other option. If the indicators for awake time aon matchre in sync, then this guide won't be able to help you any further. Otherwise move to step 2.
Install better battery stats xda edition from here. Follow the steps mentioned in this post for unrooted devices.
Open the better battery stats app on your phone and make sure the device is not charging. Lock your phone and let it sit for a few minutes.
Open the better battery stats app on your phone and check the CPU state view in dropdown at the top of the app. If percentage of deep sleep is lower than other states and you have not been using your phone a lot since it was last unplugged then the battery drain is real.
Next select the partial wakelock from the dropdown. If an app has a 100% time for wakelock ( duration unplugged = duration of wakelock ), then the app is the culprit. Either uninstall the app, or make sure the app does not have permissions to run in the background to avoid the battery drain.
I used the above steps to find out that MyAirtel app was holding a partial wakelock on PowerManager.wakelock all the time (even when it was not in background). Deleting the app fixed my battery drain which went from 10% per 8 hours to ~3% per 8 hours.
Hope this helps people resolve their battery drain issues.

So what happen if there's no partial wakelocks that's eating battery, but the batterylife is still subpar?

pipyakas said:
So what happen if there's no partial wakelocks that's eating battery, but the batterylife is still subpar?
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then going back to miui 9 oreo is a possible solution

ron_hyatt said:
then going back to miui 9 oreo is a possible solution
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What version do you like?

Dan_Jacques said:
What version do you like?
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miui 9 oreo (v 9.6.25)....the very best

ron_hyatt said:
miui 9 oreo (v 9.6.25)....the very best
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The only problem is the buffer lag to GCam shots :/

Dan_Jacques said:
The only problem is the buffer lag to GCam shots :/
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I am not an expert with gcam but v 6.1.009 works fine

ron_hyatt said:
miui 9 oreo (v 9.6.25)....the very best
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Any xiaomi.EU link???? i can t find smthing
thank u bro

emmanuelo7 said:
Any xiaomi.EU link???? i can t find smthing
thank u bro
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the one i tried was official global stable miui 9(9.6.25) oreo not eu

Check battery health if no partial wakelocks are found
pipyakas said:
So what happen if there's no partial wakelocks that's eating battery, but the batterylife is still subpar?
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Check how many cycles of battery charges have happened. Battery is bound to degrade over time. You can follow this article to see how is your battery health.

a1shakes said:
Check how many cycles of battery charges have happened. Battery is bound to degrade over time. You can follow this article to see how is your battery health.
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Another way to do this using a USB charging monitor. To measure is to know but know what you measure!
A lot of mistakes I have seen on the internet is people checking the capacity the following way. They use the mAh that went into the phone. That is completely wrong since a batteries capacity in mAh is defined at the working voltage of the battery (3.7 or 3.8V) and not using the around 5V that the charger outputs. At QC voltages it will be even lower then!
The more correct way to measure a battery is to work in mWh (milli Watt hour) or the actual power going into the battery. With 'The more correct way' you must take into account that the charging circuit also takes a bit of the juice.
So in our case 3.8V and 4000mAh would result in 15.200mWh. So from 0 to 100% should result in around that value.
At this right moment I am checking mine after a year of use using the UM25C tester.
To be honest I am not really happy about the battery life since it drains about 2 to 3% per hour even during the nighttime on a Xiaomi.eu rom which even reinstalled from scratch to check if it helped.
My redmi note 5 pro is now on , and I bloody kid you not, 34% 6d 2h 3m, yes that is 6 days after I installed a clean rom. And yes, not really much use but still wifi active and a active sim card.

Standby drain on 55.0.A.11.25

Anyone have standby drain on 55.0.A.11.25? Anyway to fix it?

lrsong96 said:
Anyone have standby drain on 55.0.A.11.25? Anyway to fix it?
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please check the apps that causes the battery drain and then restrict them from running on the background. I also have Xperia 5.

nolihowell said:
please check the apps that causes the battery drain and then restrict them from running on the background. I also have Xperia 5.
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How about 'Mobile Network standby' drain ?

lrsong96 said:
How about 'Mobile Network standby' drain ?
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Are you referring to this?

nolihowell said:
Are you referring to this?
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It seems normal in my case

You can always perform a factory reset but please make backup first.

nolihowell said:
Are you referring to this?
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Yea, overnight standby 'mobile Network standby' will show 1-3%, but my battery drained around 5-10%, and I checked gsam battery monitor, no other apps is consuming the battery.

lrsong96 said:
Yea, overnight standby 'mobile Network standby' will show 1-3%, but my battery drained around 5-10%, and I checked gsam battery monitor, no other apps is consuming the battery.
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Backup the settings and files on your phone then perform factory reset if then the issue still persist contact sony support.