Database Develop

[Q] Battery Issues / Questions

I read through quite a few of the battery issue threads but would still appreciate specifc advice on the issue I am having with mine.
I already couple times did the stats wipe as per the tweak guide on OT site but do not seem to have any benefit from doing it.
I am encountering the following issues:
Charging
Charging is very finiky. If i am charging in operation or while turned of the tab will seem to stop charging at certain levels of charge between 70% and 95%. If it happens while charging turned off I need to disconnect and reconnect in order to coninue charging, sometimes a few times.
If it happens when in operation similar will happen but also when the charge is reported at 100% I tun off the tab only to find out that the charge level reported by the off battery icon is not 100%. On different occasions it displlayed anywhere from 80 to 95% (estimated). Dont remember ever seeing it at 100%.
Discharging
If I turn on flight mode overnight I will get almost no discharge all night 0%-1% which seems very cool but my normal use is really wireless thethering. I just started not even 10 minutes ago from 100% charge and already at down to 90%. Just playing a game or browsing or reading the forum using the XDA app can completely discharge the battery in less than 2-3 hours. All of this in spite of the fact that I am on Jupiter, UC and UV heavily. I also manualy been stopping running services like skype and yahoo messenger.
I am afraid this could be a a battery hardware issue but would appreciate a confirmation or a suggestion of what else I can try before restocking and going to the service center to get the battery replaced.
Maybe you could advise which system apps I can freeze with Titanium and still be able to maintain wireless tethering and phone functions. Maybe an advice on a task killer and what I can and can't kill to keep the mentioned functionality.
While writing this post I lost 8% charge!!!

Dont get any task killers they kill system process then the system has restart them which kill battery. Have you tried wiping batterystat.bin when below 10% and charging to 100% while powered off.
Sent from my GT-P1000 using XDA Premium App

Or try backing up data and restocking and installing the WIPE version of
Jupiter or of kratos.
Sent from my GT-P1000 using XDA Premium App

aliaksei said:
Or try backing up data and restocking and installing the WIPE version of
Jupiter or of kratos.
Sent from my GT-P1000 using XDA Premium App
Click to expand...
Click to collapse
thanks mate, I always restock and do the wipe version. currently on Jupiter and will soon be moving over to Kratos. Reading good stuff about it.
aliaksei said:
Dont get any task killers they kill system process then the system has restart them which kill battery. Have you tried wiping batterystat.bin when below 10% and charging to 100% while powered off.
Sent from my GT-P1000 using XDA Premium App
Click to expand...
Click to collapse
The only way I would install a task killer would be if I could get someone to tell me which tasks to ignore so I wouldnt get this issue. No have not tried the below 10% wipe but will do so since you mentioned it. In the Kratos thread somebody mentioned to let it completely discharge and then without connecting to boot into CWM and let it further discharge. Aparently a system full discharge is not a full discharge and there is another couple hours juice left in the battery to keep the CWM going. Would this be a good idea?

Thanks to the helpers and to all you readers I think I found the issue. It seems to be a hardware problem but not with the Tab. The problem was with the charger.
I accidentally came across a car charger, bought it, used it to partially top up a couple times in the car and right away the Tab seemed a bit different. So I went back and bought a mains charger plugged it in last night and for the first time in quite a while it charged to 100% and it happened within expected time. Put it on charge at 1.30am and it was at 100% at 5.30am when I woke up.
Dont think it will effect the drain much but it is definitely giving me more juice to start with.

Oops!
Sent from my GT-P1000 using XDA Premium App

After running Kratos for quite a while with my new chargers and recalibrating by the book I am getting the expected level of battery juice. The tab charges efficiently to100% every time.
Drain is still an issue for me though. If i set airplane mode overnight (8hours) it will loose 1% charge but 9%-10% without airplane mode. On standby and in use the drain is consistant and fast. Not even UC and agressive UV helps.
I did a lot of app freezing and it realy doesn't make a major difference. Normaly I have only 4 services running. Settings, Google Services, AnySoftKeyboard and Google Maps.
I don't think I had the same drain on Hermes even though i didnt UC, UV and had at least a dozen services running. Think my battery life was better while others were complaining about wifi reconnection issues. ASAP I will try going back to Hermes to either confirm the issue with Jupiter/Kratos or to just accept this as normal and shut up.
Sent from my GT-P1000 (Overcome, Kratos) using XDA App

I finaly narrowed down the battery issue.
When on wi-fi i will get up to 3 days of battery life but only up to 16 hours on 3G.
It has been suggested to change the modem. I am curently on JPZ. My GT-P1000 was originaly purchased in Saudi and currently, until my next contract who knows where in the world, using it in Croatia.
A suggestion on the most battery efficient modem that works globaly would be appreciated.
Sent off the Blue Marble using GT-P1000 on Kratos via XDA App

MutantWizard said:
I finaly narrowed down the battery issue.
When on wi-fi i will get up to 3 days of battery life but only up to 16 hours on 3G.
It has been suggested to change the modem. I am curently on JPZ. My GT-P1000 was originaly purchased in Saudi and currently, until my next contract who knows where in the world, using it in Croatia.
A suggestion on the most battery efficient modem that works globaly would be appreciated.
Sent off the Blue Marble using GT-P1000 on Kratos via XDA App
Click to expand...
Click to collapse
FYI - Kratos Overcome ROM has(or had, there's a new one out today and it might fix this?) a bug with wifi where that if you leave the network and then reenter it without manually turning off then on the wifi, it will constantly reconnect(or something) and burn battery like mad.
For now I just flip the wifi off/on again when i connect to a new wifi since i didn't want to leave Overcome. Hopefully the new one fixes it.
---------- Post added at 07:05 AM ---------- Previous post was at 07:04 AM ----------
and by leave/reenter network, i mean physically walking outside the network range until it disconnects, not disconnect/reconnect through the tab settings.
It may only happen moving from one network to another (i go from home wifi to work wifi to home wifi each day).

Mate thanks for the reply but think you misunderstood. I dont have an issue with wifi. My issue is with 3G/mobile network over SIM card. That one burns the battery.
Sent off the Blue Marble using GT-P1000 on Kratos via XDA App

darkmattar said:
FYI - Kratos Overcome ROM has(or had, there's a new one out today and it might fix this?) a bug with wifi where that if you leave the network and then reenter it without manually turning off then on the wifi, it will constantly reconnect(or something) and burn battery like mad.
For now I just flip the wifi off/on again when i connect to a new wifi since i didn't want to leave Overcome. Hopefully the new one fixes it.
---------- Post added at 07:05 AM ---------- Previous post was at 07:04 AM ----------
and by leave/reenter network, i mean physically walking outside the network range until it disconnects, not disconnect/reconnect through the tab settings.
It may only happen moving from one network to another (i go from home wifi to work wifi to home wifi each day).
Click to expand...
Click to collapse
So to understand what you are saying explicitly.
At home I connect to WIFI -- XXZ.. Its already a remembered network. I drive away from home and come to office here WIFI is YYZ (Already remembered network). So it automatically connects. THIS CAUSES the batt drain????
If yes, I am extremely happy. Coz I dont turn off WIFI it connects at home n office automatically. Please corroborate!
Al

> I finaly narrowed down the battery issue. When on wi-fi i will get up to 3 days of battery life but only up to 16 hours on 3G.
I think that is normal standard consumption. 3G is known battery hog and you cannot compare its runtime vs. wifi. Is 3G on all the time, or maybe you attempted to use interval disconnectors (ie. battery saver apps) like JuiceDefender, Green Power, the likes?

Thanks jtdc!
I move around the world a lot and rarely set up wifi so most of the time I am full time on 3G. I dont use any power saving tools like you mentioned. Insted I use Titanium to freeze any apps that unnecessarily show up in running services.
I only noticed the differwnce with wifi due to an exteded visit with a relative who has wifi in his house. It wont be long and I will again be full time on 3G and would realy like to extend the battery life by minimum 4 hours. Are you aware if there is a known difference in power consumption between different modems or if any of the tools you mentioned can deliver this kind of savings purely by managing the 3G operation?
Sent off the Blue Marble using GT-P1000 on Overcome 7, v4 via XDA App

if any difference of modems that would be minimal to negligible. what always comes as the factor is the strength of signal and of course the tab which always scans for it whenever you're on the move. what you experience is typical, and in best case good because 16 hours on 3G always on? your battery and tab must have been setup really well.
if you can bear with interval disconnector apps like i mentioned, it would increase your runtime. for instance you can have the app connect every 15 minutes to 3G then be online for at least a minute to have all your internet dependent apps sync (email, messages, news, etc) and have traffic threshold detection in case in a minute some transfer still ongoing, then maybe 2 minutes is long enough. then for the next 15 mins 3G is off, then it will repeat the cycle. in that manner there's quite a lot of power to be saved and will definitely extend your runtime.
if really no other choice, i suppose you need to buy an external battery solution, the likes of energizer xpal, so you won't have to worry about battery life.

Great, thanks, that solution is acceptable for apps that require data services. Can you recomend an app to use for setting it up.
I expect it would prevent me from using inbound calls via Skype but how would using such an app impact incoming sms service and voce calls? Would they come through and would voice call quality be impacted.
Sent off the Blue Marble using GT-P1000 on Overcome 7 v4 via XDA App

"Green Power" in android market does the job and its free, that takes care of data connections (wifi or 3G) and will not tinker with the GSM radio, therefore sms and voice calls are untouched. The other app "Juice Defender" you can customize even to turn off the GSM radio, even downlclock the cpu, etc. which will result more savings but is a paid app.
Let us know how that helped to increase your runtime

New ICS UK official release battery drain

Manually upgraded over stock non rootable CarPhone Warehouse GB rom using PC Odin.
Im getting very bad batrery drain. On the stock GB rom my phone would easily last two days with moderate use. Now with the ICS rom its draining pretty fast. I took it off the charger approximately 1.5 hours ago and with little to no use Im already at 90%. Same stock settings and same apps. Only difference is I am now using Apex Launcher.
I noticed wifi constantly on even during deep sleep but i have now configured it to only be on while plugged in.
Ive pulled he battery out for a few minutes and that hasnt helped. One last thing im going to try is revert back to GB and then wipe, clear cache and upgrade again...
Any advice/help would be appreciated..
Sent from my GT-N7000 using XDA

I´ve had the same wifi problem, german stock ICS though, weird enought it seems to happen just with my home´s router. I´ve checked in other places and all was fine. A couple of users here changed their routers seemed to solve the issue. See if this is of any help....
Cheers,
VR

My note seems fine, have you tried the fix below.
John.
http://forum.xda-developers.com/archive/index.php/t-1507905.html

Also try to find ways to analyse your battery usage, enough posts on that here
Cpuspy for deepsleep
Betterbatterystats for whats keeping phone awake
Android sucks in providing the info you really need up front.
Sent from my GT-N7000 using Tapatalk 2

so far i find the battery usage pretty good tho for wifi i had to change the router in order to connect

Tinderbox (UK) said:
My note seems fine, have you tried the fix below.
John.
http://forum.xda-developers.com/archive/index.php/t-1507905.html
Click to expand...
Click to collapse
Thanks..applied this..will test this and report back...
Sent from my GT-N7000 using XDA

baz77 said:
Also try to find ways to analyse your battery usage, enough posts on that here
Cpuspy for deepsleep
Betterbatterystats for whats keeping phone awake
Android sucks in providing the info you really need up front.
Sent from my GT-N7000 using Tapatalk 2
Click to expand...
Click to collapse
Thanks..installed these apps..cpy spy is reporting 24 mins of deep sleep...everything seems in order...weird
Sent from my GT-N7000 using XDA

Yeah, i updated to the lpy ROM when it was released and found the lack of deep sleep issue causing a problem. The above fix sorted it and I've had no problems since, performance has been noticeably better and battery life has been just as good, if not slightly better, than under ginger bread
Sent from my GT-N7000 using Tapatalk

DarthVR6 said:
Thanks..installed these apps..cpy spy is reporting 24 mins of deep sleep...everything seems in order...weird
Sent from my GT-N7000 using XDA
Click to expand...
Click to collapse
Takes longer to analyse bro.
In those 24 min abnormal battery drain?
Best to check battery percentages.
Next to these two apps you can check badassmonitor or equavalent, they have also good measuring for actual battery usage per app.
Analysing sucks thought, totally not user friendly.
Sent from my GT-N7000 using Tapatalk 2

I could be wrong but it seems as if my wifi is still constantly active...battery drain is pretty bad...i think im going to revert back to GB, perform a full wipe and cache cleane and re install...

I did an "factory data reset" before and straight after i upgraded to the official UK ICS.
I did read if you use the alarm clock, it keeps your phone awake, even after you disable it, other apps most likely do the same.
Below is a picture over night, I always manually enable/disable wifi/bluetooth/gps as have yet to find an app that works correctly.
John.

Yeah tipically you would be looking for the following:
If your device goes into deepsleep at all. (on battery that is)
You can check this with cpu spy.
If it doesnt check the kernel wakeloks (high level) and the partial wakeloks (zoomed into detail level, best level for troubleshooting).
Anything there that runs often and long is probably causing the deepsleep insomnia. I wish Android would be better in able to determine what really influences your phones battery.
Next to this, some apps you can change synch settings (within apps itself, e.g. facebook etc) Thats just a typical change. every sync uses energy, and wakes up device.
Another possible check is the power on of with airplane mode.
Another tip is unchecking the sounds when touching touchscreen (a bug from the old days of android, and they never fixed) this is a major wakelock causer and by default turned on.
I usually get 4~5 hours nonstop onscreen time after tweaking it (without setting to much stuff of, otherwise I could have gotten a normal phone lmao)

after factory reset and data wipe on your galaxy note please calibrate the battery both ways...horizontal and gyroscope.
This will definitely help your phone better monitor the battery and bring it to normal status..

Tinderbox (UK) said:
My note seems fine, have you tried the fix below.
John.
http://forum.xda-developers.com/archive/index.php/t-1507905.html
Click to expand...
Click to collapse
I tried out the steps mentioned in above link and I think its working for me.
After upgrading my note to UK ICS release the battery is drainig like anything.
Its like 1% every minute .
After applying steps mentioned in the url its not draining that much. MAy after some more recharge cycles it will be more stable.

Battery Drain?

When I got the phone my battery was pretty phenomenal (comparatively speaking). But it seems since I took the update that Sprint pushed out a few weeks ago, the battery can't make it more than a few hours with light/moderate use. Its really horrid to be honest. Hoping the eventual 4.2.2 OTA will fix this. But in the meantime I wanted to know if anyone else was having this issue and possibly help identify the source of the problem. (By the way I am not rooted)

daltonroland said:
When I got the phone my battery was pretty phenomenal (comparatively speaking). But it seems since I took the update that Sprint pushed out a few weeks ago, the battery can't make it more than a few hours with light/moderate use. Its really horrid to be honest. Hoping the eventual 4.2.2 OTA will fix this. But in the meantime I wanted to know if anyone else was having this issue and possibly help identify the source of the problem. (By the way I am not rooted)
Click to expand...
Click to collapse
Have you checked the version of your Google Play Services APK? It can cause a particularly nasty bug on HTC devices.

Rirere said:
Have you checked the version of your Google Play Services APK? It can cause a particularly nasty bug on HTC devices.
Click to expand...
Click to collapse
Play Services is v 3.1.36 but the actual Play Store is v 4.1.10 which is said to "fix battery drain issue." Still seems to be draining pretty rapidly. Any fix you know of?

Can we see your usage stats?

daltonroland said:
Play Services is v 3.1.36 but the actual Play Store is v 4.1.10 which is said to "fix battery drain issue." Still seems to be draining pretty rapidly. Any fix you know of?
Click to expand...
Click to collapse
The Play Store update should have also pushed Play Services, so yeah. Could we see your usage and also your app list/sync settings?

I'm in the same boat, even after the Google Play Store fix.

Seriously, we need usage stats.

Sorry, been working in home WiFi.
Hardly been using the phone since I still have my old Evo LTE and the battery is better on that.
Sent from my HTCONE using xda app-developers app

Sent from my HTCONE using xda app-developers app

Wifi used up 43% of 60% of your battery? That's like a quarter of your battery gone! Am I the only one who thinks that's weird? Can we see the graph and awake time etc? (Sorry for the trouble, but it's the only way we can tell)
---------- Post added at 11:44 AM ---------- Previous post was at 11:34 AM ----------
daltonroland said:
Sorry, been working in home WiFi.
Click to expand...
Click to collapse
Just wanted to ask, what does that mean? (Not trying to be negative in any way)

sauprankul said:
Wifi used up 43% of 60% of your battery? That's like a quarter of your battery gone! Am I the only one who thinks that's weird? Can we see the graph and awake time etc? (Sorry for the trouble, but it's the only way we can tell)
---------- Post added at 11:44 AM ---------- Previous post was at 11:34 AM ----------
Just wanted to ask, what does that mean? (Not trying to be negative in any way)
Click to expand...
Click to collapse
Well, in fairness for the last week or so I've been charging the phone and leaving it in my room. The screenshot was after like a day and a half in which a hardly used it and had WiFi on.
By working on home WiFi I meant talking to ISP and bumping up speeds, for the second time in a week.
I'll post the graph when I get home from work or early tomorrow as the phone has been unplugged for about 20 minutes.
Sent from my HTCONE using xda app-developers app

It won't hurt if you actually use it. Watching vids/playing games prevents blown up stats like that.
EDIT: Please, also include stats like screen time, awake time, cell reception, Wifi etc.

This was at work. I hardly use my phone at work fyi.
Sent from my HTCONE using xda app-developers app

Dropped 25 ish percent in 6 hours? What seems to be the problem?
With your usage, that would give you a day. I'm happy with 11 hours.

But with no internet connection and hardly any use. It concerns me because usually it would drop 5 maybe 10%. It was great on sleep.
Sent from my HTCONE using xda app-developers app

OK, now that I think about it, you're right. I remember getting more than 2 days on standby with absolutely no use (on wifi).
A day with that kind of usage is really not that good. It's weird because your stats don't show anything odd. I'd like to see some moderate to heavy usage stats though. The kind you say gives you 5 hours. That would help more.

Here you go. About 50% gone in about an hour of use (on WiFi) mostly on YouTube/Twitter or music with regular use of ATK.
Sent from my HTCONE using xda app-developers app

I'm having a serious battery drain issue with my Sprint One also, though I don't remember exactly when it started - it might very well have been that OTA update.
My battery drains when the phone is asleep. The phone will be dead in just over 24 hours from 100%, with less than one hour of screen usage. The integrated "usage" monitor shows that WiFi consumes this power , whether or not WiFi is in use. I have a paid task manager app that can track stats over time, and according to it, the processor appears to be running at ~15% constantly when the screen is off. I've tried disabling WiFi and having the phone sleep on just the cell network, to no avail. I first thought that perhaps the poor service at my house was causing it. However, I watched the battery drain at exactly the same rate when in an area with perfect coverage.
Here's the weird part - I tried airplane mode'ing my phone. Airplane mode doesn't seem to stop it. In fact, airplane mode seemed to accelerate the drain! I find it simply unacceptable that my phone will die like this with almost no usage.
I feel that the problem is not a rogue third-party app I have installed. I've used the "disable" option on Facebook, Twitter, and I've removed several other suspected apps. It makes no difference. I even suspected my task manager app; I tried removing it and looking at the integrated one, and there was no difference.

flyboy21141 said:
I'm having a serious battery drain issue with my Sprint One also, though I don't remember exactly when it started - it might very well have been that OTA update.
My battery drains when the phone is asleep. The phone will be dead in just over 24 hours from 100%, with less than one hour of screen usage. The integrated "usage" monitor shows that WiFi consumes this power , whether or not WiFi is in use. I have a paid task manager app that can track stats over time, and according to it, the processor appears to be running at ~15% constantly when the screen is off. I've tried disabling WiFi and having the phone sleep on just the cell network, to no avail. I first thought that perhaps the poor service at my house was causing it. However, I watched the battery drain at exactly the same rate when in an area with perfect coverage.
Here's the weird part - I tried airplane mode'ing my phone. Airplane mode doesn't seem to stop it. In fact, airplane mode seemed to accelerate the drain! I find it simply unacceptable that my phone will die like this with almost no usage.
I feel that the problem is not a rogue third-party app I have installed. I've used the "disable" option on Facebook, Twitter, and I've removed several other suspected apps. It makes no difference. I even suspected my task manager app; I tried removing it and looking at the integrated one, and there was no difference.
Click to expand...
Click to collapse
Check to make sure never auto turn on Wi-Fi is checked in Wi-Fi advanced settings. I was going to suggest poor reception since that kills my battery, but you mentioned trying airplane mode.
With screen off and nothing running, it's not surprising that Wi-Fi is the main battery drain. But it is too fast in my opinion too.
Sent from my HTCONE using Tapatalk 2

Is high performance Wi-Fi disabled?
Sent from my HTCONE using xda app-developers app

High CPU usage and lots of GPS activity since installing kitkat upgrade

I installed the Sprint OTA kitkat upgrade last night. This morning, I started noticing that my battery was draining much more quickly than normal - 12 or more percent per hour with no usage, wifi on while in easy range of my home wifi (normally I see less than half this drain unless I am actually using to phone or off wifi). I've also noticed that the "receiving location data from GPS" notification icon keeps flickering on and off rapidly, sometimes almost constantly. I don't know if the two are related.
"Power Saver" is on, and battery usage shows 87% for "Android System".
Anyone else seeing this?
I've just tried turning Location Services off to see if that has any effect.
Sent from my iPad using Tapatalk

Update: it's definitely Location Services. After turning it off, my "idling" battery utilization dropped to about 3% per hour. What gives?
Sent from my iPad using Tapatalk

levman said:
Update: it's definitely Location Services. After turning it off, my "idling" battery utilization dropped to about 3% per hour. What gives?
Sent from my iPad using Tapatalk
Click to expand...
Click to collapse
Yes this is a know issue when using gps/wifi for location. Try using only mobile network for location unless you need gps for maps.

alray said:
Yes this is a know issue when using gps/wifi for location. Try using only mobile network for location unless you need gps for maps.
Click to expand...
Click to collapse
Known problem for the HTC ONE in general, or known problem for the HTC ONE with kitkat? I've had the ONE for 9 months, use the GPS extensively (so Location Services is always on and enabled for GPS) yet I never had this problem until upgrading to kitkat.
Sent from my iPad using Tapatalk

The answer, at least in my case, was a hard reset. I did that, reinstalled my apps, and the GPS / battery issue has gone away. I was also having other intermittent weird issues that have gone away since reinstalling. I guess the upgrade must have corrupted some things...
Sent from my iPad using Tapatalk

Install/run AppOps and disable location permissions for Google Play Services and any other app that you think doesn't need location permission.

wlan_wow_wl Wakelock issues

wlan_wow_ml is causing the majority of my drain. I'm not too familiar with this one. msm_serial_hs_rx is also very high. I've tried everything I can to get better battery life. I average about 20hours with 4-4.5hours screen on time.
Any ideas?

I get a lot of this wake lock as well, no idea what it is

The first one is the connection to a wireless network. No idea on the second. Download gsam battery monitor. Let it run for 24 hrs after a full charge. Gsam has a built in app called app sucker. Open that and at the top there is a drop down menu to view kernel wake locks. Then you can select each one and after that opens there's a button that says Google me. That'll tell you what each one is.
Sent from my Nexus 10 using XDA Free mobile app

I posted this on the Motorola Support forums as well as a question on the msm_hsic_host wakelock and one person said this
"I think that the "wlan_wow_wl wakelock" is a software lock included in the Android OS and installed so that your phone does not wake every time it sees your (or other) wireless network access points. I believe the msm_hsic_host wakelock is related to the data radio for the same purpose. Both designed to keep battery drain to a minimum when the phone is idle.."
so guess these wakelocks are good to have.

So these are wakelocks to avoid wakelocks? Lol

cyberr8der said:
So these are wakelocks to avoid wakelocks? Lol
Click to expand...
Click to collapse
i guess?? lol

These wakelocks are too high to ignore...
It seems to be related to qualcomm drivers and afaik they already fixed it, but we need to wait for Motorola to implement the fix in a future update.

I have the same problem. This caused my battery to drop 10% idling for 6 hours with no apps installed. I hope it gets fixed soon.

Here we go again...

8 hours awake (because of msm_hsic_host and wlan_wow_wl)... This can't be right.

Is there any solution with battery drain"wlan_wow_wl wakelock"?

ramzal said:
wlan_wow_ml is causing the majority of my drain. I'm not too familiar with this one. msm_serial_hs_rx is also very high. I've tried everything I can to get better battery life. I average about 20hours with 4-4.5hours screen on time.
Any ideas?
Click to expand...
Click to collapse
Do you have this app installed : https://play.google.com/store/apps/details?id=net.loadinghome.smartunlock
Or anything similar that uses some kind of rule based on wireless SSID ?
Or even an wireless files sharing app that stays on ?
That wlan_wow_wl is cased of periodic scans of the wireless status IMO, like searching for networks around you or looking if you are still connected to certain network!
You could try disabling "always WiFi scan". In Android 5 is found under advance settings from WiFi menu(from the 3dots menu), in Android 6 is found under geolocalisation (GPS) in the search menu(from the 3dots menu)
Inviato dal mio XT1575 utilizzando Tapatalk