Database Develop

Constant Wifi scanning

I've been running Cognition 3.02 for a few days now and just noticed that my phone scans for wifi networks every 2 to 3 seconds. Wifi status says "scanning" and the the status above the populated network list says "scanning" every few seconds. Is this normal? Is there anyway to change the interval or make it manual without disabling wifi?

I have the scanning for wifi words about every 3 seconds also, so Im guessing it's normal. What's bugging you about it?
Sent from my Captivate using XDA App

Just concerned about battery use. I have since changed the wifi sleep policy to "when screen is off" and it's a tad better although still not great. I also have gps off. I think it may have to do with my exchange account as my wife has the exact setup but without an exchange account and her battery life is significantly better. With the sleep policy set to when screen is off, I lost 8% batter over the last 2.5 hours with no activity at all. I was just sitting on my desk. Is that normal? I find that I get the best battery life when I'm connected to a wifi network like at home. I suspected it had something to do with scanning since it seems to do that very often when I'm not connected to a network.

If you have any custom ROM it drains your battery way more than stock. I am on pheonix 3.5 and I get roughly 12 hours while on stock I got roughly 30 hours. So yea, major decrease.
Sent from my GT-I9000 using XDA App

If you are only getting 12 hours when you were getting 30, you should try a different kernel.
Edit..and the wifi scanning is normal behavior it is not the cause of battery drain.

Any suggestions?
Sent from my SAMSUNG-SGH-I897 using XDA App

[Q] Does wifi turn off during sleeping mode?

Hi to everyone. I forgat to turn my wifi off during my working hours. In the nd of my shift, i check my battery and it was proximately %5 left and even i didnt use the phone during my shift. it was %50 or something before starting. Does wifi still work even on the sleeping mode?
Thanks guys

no it stays on unless you set up the power saving mode i use custom settings so that wifi etc will turn off at 40% battery

wi-fi is a big battery drainer. Always have it off if you don't need it. Same with gps, data, and auto-sync for various accounts

Try using juice defender. I think the free version always you to enable wifi control (after your phone goes into sleep mode it should turn off the wifi until you wake it up)
Sent from my MB870 using XDA Premium App

juice defender is in itself a battery drainer. don't use those "battery saver" apps. they're all bs. just get in a habit of turning off connections manually when you don't need them.

Are you aware of the setting: wifi settings/advanced/wifi sleep policy and set it to sleep when screen turns off?

Higgsy said:
Are you aware of the setting: wifi settings/advanced/wifi sleep policy and set it to sleep when screen turns off?
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Thanks I didn't know about that setting, but my question is once wifi turns off mobile data kicks in. Which drains battery more? Wifi or mobile data?
Sent from my GT-N7000 using Tapatalk 2

They both drain battery equally as much. Mobile data shouldn't kick in unless you have it toggled on.
Sent from my GT-N7000 using xda premium

Use Green Power to automatically disable wifi and data when the phone goes into stand by. There are lots of settings like enabling wifi at certain intervals to sync email/whatsapp/other push services.
On GB for me it's the difference between losing 25% battery overnight without it and losing only 3% when it's enabled and that's with sync every hour.
It seems that on any ICS rom wifi doesn't use any juice even when enabled in standby. Because of the kernel bug in the leaks I'm now on the official CM9 rom and after almost 9 hours with wifi turned on I only lost 4%, on every other ICS rom I tried I get the same results.

wifi
zen0s said:
Thanks I didn't know about that setting, but my question is once wifi turns off mobile data kicks in. Which drains battery more? Wifi or mobile data?
Sent from my GT-N7000 using Tapatalk 2
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install battery saver or juice defender , i recommend the second one

firasusman said:
install battery saver or juice defender , i recommend the second one
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I tried juice defender ultimate but connection was on and off and time to time it took ridiculous amount of time to get the connection back :/ also I don't know why with juice defender I noticed sluggish performance phone, after uninstalling everything was much more snappy.
I have wifi on all the time and I only lose about 2-3% over night on stock, I guess it's fine the way it is for me without using all those battery "saver" apps.
Sent from my GT-N7000 using Tapatalk 2

dr. xp55 said:
juice defender is in itself a battery drainer. don't use those "battery saver" apps. they're all bs. just get in a habit of turning off connections manually when you don't need them.
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I disagree. I definitely get power savings with JD compared to without it. Auto-disabling WiFi saved loads of power for a start, and my overnight drain has gone from 3-5%, to approx 1% with JD running. I'm not saying all batt saver apps are worth using, but JD works for me.
Its a lot easier to have a well-behaved app that DOESN'T use a lot of power itself manage your connection toggling rather than having to remember to do it yourself.

dr. xp55 said:
They both drain battery equally as much. Mobile data shouldn't kick in unless you have it toggled on.
Sent from my GT-N7000 using xda premium
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Wrong. WiFi uses more power. Its a separate transmitter being driven by the battery, whereas as mobile data will use the existing transmitter (phone) that's already on, but obviously drive it a little harder than if it was all off.

Data battery drain

Hey everyone.
The battery life on my Ace without using data is brilliant. Even using wifi and playing games etc it can last around 2 days.
When data is turned on I can see the battery % counting down when I use Facebook or use the web browser.
This has happened on a number of ROMs I've tried, even stock based ROMs. I tend to use either on demand or smartass cpu settings.
I'm currently using Democracy 3.2 and it's having the same problems.
Has anyone else experienced this or found a way to fix it?
Sent from my GT-S5830 using xda app-developers app

Some apps that have internet permissions connect every now and then. With data on, battery will drain:
-when transferring data
-when switching edge, 3g and h
-when establishing data connection if it is ever lost.
If you got lots of apps transferring data, it can be solved by installing a firewall on a rooted phone (like droidwall).
The other thing is bad network coverage, which cannot be solved (switching too often or reestablishing data connection frecuently).
Edit: either way, data is a major battery hog when actively browsing (facebook, talpatalk, browser)

If using wifi isn't an option, some users report better battery life using 2g only

I don't think 2G would be an option for me... I've tried it before and the load speeds are far too slow for a lot of my apps to be usable.
I have noticed that the battery drains a lot when trying to establish H/2G/3G connection. I usually just turn data on only when I need it. Do you think it would be better for the battery to leave data on all day so it doesn't have to reconnect when I ask it to 10 times a day?
It seems to be the Facebook app that drains it most. Email / XDA / Dolphin doesn't impact battery quite as much.
Sent from my GT-S5830 using xda app-developers app

Constantly switching data on/off drains more battery than leaving it on all day cuz it will only use battery when transferring data, and if you're on wifi, wifi has preference.
The switching and establishing of data connection drains more battery than the screen at max brightness.

dxppxd said:
The switching and establishing of data connection drains more battery than the screen at max brightness.
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Wow... That sucks... Is that just for Ace's? My girlfriends HTC Sensation doesn't seem to be affected by switching data on/off a few dozen times a day.
I'll give it a try today. Data is on all day and I'll see if I can squeeze a bit more juice out of it. I've also installed droidwall so that everything gets wifi access but only the stuff I use gets data access.
Thanks for your suggestions, I'll let you know how it goes :victory:

I've given it a try.
Previously I'd turn data on/off when I needed it and it would use 5-10% battery establishing connection and transferring data.
With data on all day I lost 5% in the morning establishing connection but after the transferring data throughout the day impacted the battery far less. I think it really helped that I had droidwall so there wasn't anything downloading in the background that I didn't want to. I got home at night and still had around 70% battery left.
Thanks for your help and advice guys :victory:

I'm shocked, without 3G I still only manage 1 day not 2days count yourself lucky!

I have same problem
Wifi uses less battery then data
Sent from my GT-S5830 using xda premium

nevis said:
I'm shocked, without 3G I still only manage 1 day not 2days count yourself lucky!
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Turning data on/off a few times again I'd get about a day if I was lucky.
My phone has been on for a little over 24 hours with data on and it's on 80% right now... I've only really used 3G a couple of times but I'm not a particularly heavy user. It spends a lot of it's time locked and a asleep.

wifi sleep policy

strange thing..
if i set "keep wifi in sleep" to never it just stays on.
i got cpuspy to see if it really goes into deep sleep but the wifi just stays on.
i know i had this problem with customrom JB on my LG optimus black but now i have official JB on my XT and got the same problem here.
i need to install a app to control the wifi like i want it too..
(i always set wifi to disconnect when the phone enters deep sleep, my experience tels me that 2g data drains less battery then wifi)
however i didn't really test drain level of wifi/2g data on my XT.

S10e wifi battery drain?

I got my S10e exynos a little over a week ago and gave it some good weekday battery life testing throughout the this past work week.
The screenshot is after a day of work, with the vast majority of the time on LTE and noticing massive WiFi drain. I've noticed that WiFi drains between 25-45% no matter if I'm using WiFi the majority of the time or not. Compared to my Pixel 3 that drains 5-10% from WiFi.
Anyone else getting WiFi drain? Could someone with a S10e SD855 post some battery stats? Please use gsam if possible.

Is your WiFi scanning turned on?

big_b0sss said:
Is your WiFi scanning turned on?
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Hard to determine which of these options would be considered "WiFi scanning", but they're all off except LTE switch over.

Just search wifi scanning and Bluetooth scanning

Biometrics and security, location, improve accuracy, turn off wifi / bluetooth scanning.
connections, wifi, advanced, I disabled the "switch to mobile data" to get better battery

Yes I am having this issue as well on my S10+ US Unlocked version. 1.5 hours of screen on time draining 5%, WIFI draining 8%. Doesn't make any sense. All o fmy WIFI scanning and auto switching is turned off.

Someone said it is because the phone doesn't go back to sleep on Exynos models after you've received a phone call
A reboot fixes it until your next phone call
Patch should fix it

Reboot doesn't fix it for me. I also have had two different s10s so it is definitely something software related. It drains so Mich that I keep wifi off unless I absolutely need it.