Develop Bugs

Wifi speed while screen off

So I was streaming music from MOG and all was working well until my screen went off (idle). Music started to pause/buffer and kept doing so every 10 seconds. When I turn the screen back on and stare at it, it won't do it at all and I can see it load full on the seek bar. Only happens when screen goes off and phone goes idle. I'm guessing its something with the CPU throttling maybe? Is there any way I can fix this? I'm connected on WiFi 5G and I have "keep WiFi on during sleep - Always".

This seems to be a pretty common issue (I have it myself, when connecting via WiFi with adb I need to keep my display on) and I've seen two issues on file here and here. I've yet to see a fix for it yet though

Aww crap. Well that sucks. Does it happen on custom roms/kernels?

reyes.jr said:
Aww crap. Well that sucks. Does it happen on custom roms/kernels?
Click to expand...
Click to collapse
I'm running CM9 nightly with leankernel now. Although it's happened since I've gotten the phone, and I've ran probably half a dozen different ROMs and 3 different kernels, including stock. I vaguely remember reading some posts where people either said there was a fix or they were working on it, though I'm honestly not real sure.

K thanks for the info bro.

reyes.jr said:
So I was streaming music from MOG and all was working well until my screen went off (idle). Music started to pause/buffer and kept doing so every 10 seconds. When I turn the screen back on and stare at it, it won't do it at all and I can see it load full on the seek bar. Only happens when screen goes off and phone goes idle. I'm guessing its something with the CPU throttling maybe? Is there any way I can fix this? I'm connected on WiFi 5G and I have "keep WiFi on during sleep - Always".
Click to expand...
Click to collapse
I am also facing the same issue. Yesterday, I was downloading ARHD 3.0 directly on phone through wi-fi. Surprisingly the progress was 1% completion per minute in screen-off mode. But the moment, I would turn on the screen, the rate became 3-4 times faster. i.e. 3-4% completion per minute.
Deviating from topic, I have seen similar behaviour quite some time back in iPad1.

kizuki.buy said:
I am also facing the same issue. Yesterday, I was downloading ARHD 3.0 directly on phone through wi-fi. Surprisingly the progress was 1% completion per minute in screen-off mode. But the moment, I would turn on the screen, the rate became 3-4 times faster. i.e. 3-4% completion per minute.
Deviating from topic, I have seen similar behaviour quite some time back in iPad1.
Click to expand...
Click to collapse
Well glad to know I'm not in the same boat. Have any of u tried android 4.0.4?

reyes.jr said:
Well glad to know I'm not in the same boat. Have any of u tried android 4.0.4?
Click to expand...
Click to collapse
Yeah, I'm on Liquid 1.25 (4.0.4 based ROM) and it still does it. If I run a speed test and turn the screen off, let it finish and check it; it will never go much over 5 Mbit/s. When I run the test with the screen on, I will get 10-20 Mbit/s. This was of course testing on my home WiFi network.
This is pretty annoying because I download anime torrents every week and it's enough of a battery killer already just to download the thing, but now I have to leave the screen on in order for it to even finish in a reasonable amount of time. I've also tried setting the minimum clock speed to 1200 MHz in SetCPU just to see if it was a CPU throttling/bottleneck issue when the screen turns off. But it made no difference . This can't be a hard fix for Google/Devs.

At least with popcorn and franco kernels you can do
echo 1 > /sys/module/bcmdhd/parameters/wifi_pm
to put wifi on high performance mode with screen off. They say this can enable high throughput.

reyes.jr said:
Well glad to know I'm not in the same boat. Have any of u tried android 4.0.4?
Click to expand...
Click to collapse
Yes, I am using ARHD 3.0 which is based on 4.0.4
There seem to be definite improvements and it was worth the effort to update.

As far as I know, wifi goes into a low power state with screen off to conserve power/battery life.

My command put it in normal power mode, but kernel must support it

KiNG OMaR said:
As far as I know, wifi goes into a low power state with screen off to conserve power/battery life.
Click to expand...
Click to collapse
oooo, so only on WiFi does this occur? On 4g it doesn't?

This also happen to me.. Happened in 4.0.1 4.0.2 4.0.4 so far I managed to bypass the issue with wifi keep alive its a free app from play store.. You could try and comment if that works for you
Sent from my Galaxy Nexus using xda premium

Threre is no need for any custom kernel module. Im on Stock ICS 4.04 and found an easy workaround. Actually this issue is not an android bug, but an issue of streaming apps that aren't proberly coded for honeycomb and ICS.

wifi sleep problem...

Hi all,
I have 4.0.4 stock gnex.
My wifi settings are this:
Settings->Wifi->(Menu Button)->Advanced. It's listed as "Keep WiFi on during sleep"
When the phone go to sleep the wifi seems to stop, I am downloading an app
from the market, when the phone go to sleep, the download sleep.

Not to doubt you on this but does it also say "Always" beneath the "Keep Wifi on during sleep"? If so, perhaps you have an app that overrides that and disables it.

I have no app that can do it.

Hi, I just tested and had no problems downloading a 50 meg game with screen off.
From honeycomb on google changed how wifi was handled when screen is off. This gives similar problems with older applications but should not be a problem for apps made by Google like Play and Music.
You still did not answer the previous posters question. You reference the advanced wifi setting but not what it is set to.
Sent from my Galaxy Nexus using Tapatalk 2

atkhobby said:
Hi, I just tested and had no problems downloading a 50 meg game with screen off.
From honeycomb on google changed how wifi was handled when screen is off. This gives similar problems with older applications but should not be a problem for apps made by Google like Play and Music.
You still did not answer the previous posters question. You reference the advanced wifi setting but not what it is set to.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
It's obviously set to always

People have had issues with the setting you choose in that menu not sticking. Try toggling it back and forth and doing some reboots. I don't have the issue on 4.0.4.

From what I understand, when the screen turns off wifi goes into a low power state, draining less battery when on standby. So it greatly reduces the speed (sometime pauses) of all connections to save juice.

KiNG OMaR said:
From what I understand, when the screen turns off wifi goes into a low power state, draining less battery when on standby. So it greatly reduces the speed (sometime pauses) of all connections to save juice.
Click to expand...
Click to collapse
I understand if it slowed down, but it shouldn't ever pause though.

This low power state is what I referred to in my previous post. An app must now explicitly request that high power wifi mode is retained when screen is off. All apps from google should be doing this already.
Unprofessional app developers that have not been reading up on the latest changes in android api (like Audible!!! shame on you) will have major slowdowns downloading over wifi when the screen is off.
Sent from my Galaxy Nexus using Tapatalk 2

I have the exact same problem as posted here And I may have found the solution at this other link here.
What seems to be working for me is the change the "Keep Wi-Fi on during sleep" to "Never (increases data usage)". That totally does not make any sense to me. If you 'never" keep wifi on during sleep it should *not* increase data usage. Anyway, I have noticed two things:
1) If I set it to "Never," the files continue to transfer when the screen goes to sleep
2) Wifi transfer rate seems to be *much* faster on my home network. I'm using ES File Explorer, so it could be app related.
Just discovered that according to Google, "Never (increases data usage)" means that it will not stay connected to WiFi while asleep which will increase your 3G/4G data usage. Never the less, it seems my Wifi is better when set to "never"

I wrote an article about wifi usage on my blog here: http://zapek.com/?p=262
You shouldn't worry about PS-Poll mode. It's fine for downloads usually as they don't require a fast interactive response.
Sent from my Galaxy Nexus using Tapatalk 2

KiNG OMaR said:
From what I understand, when the screen turns off wifi goes into a low power state, draining less battery when on standby. So it greatly reduces the speed (sometime pauses) of all connections to save juice.
Click to expand...
Click to collapse
this could be a possible reason, in my office wifi is not really powerful,
a low power state can disconnect the wifi.

I'm checking better the problem, it seems that the wifi goes into some sort of
energy saving mode when the screen is off that drop my wifi speed.
Is there a way to solve this problem?

it seems that I'm not the only one with this problem-
http://productforums.google.com/forum/#!topic/mobile/DJTwAutjsIQ

so no solution to this problem yet ?

sblantipodi said:
it seems that I'm not the only one with this problem-
http://productforums.google.com/forum/#!topic/mobile/DJTwAutjsIQ
Click to expand...
Click to collapse
This is not the same problem that you have. The thread you link to is about general download problem with screen off. Your problem was about downloading from the market while screen is off.
Sent from my Galaxy Nexus using Tapatalk 2

atkhobby said:
This is not the same problem that you have. The thread you link to is about general download problem with screen off. Your problem was about downloading from the market while screen is off.
Sent from my Galaxy Nexus using Tapatalk 2
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Click to collapse

sblantipodi said:
Click to expand...
Click to collapse
In your original post your wrote that you had problems downloading from the market with the screen off.
The android market is a google app and should not have the problem discussed in the thread you linked to.
The problems in the thread relates to applications that have not yet been updated to support power saving features in resent android versions.
So your problem is not the same.
I did write this in my previous posts from may 25. but maybe it was unclear.
Sent from my Galaxy Nexus using Tapatalk 2

atkhobby said:
In your original post your wrote that you had problems downloading from the market with the screen off.
The android market is a google app and should not have the problem discussed in the thread you linked to.
The problems in the thread relates to applications that have not yet been updated to support power saving features in resent android versions.
So your problem is not the same.
I did write this in my previous posts from may 25. but maybe it was unclear.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
the problem is present in all apps, google one and non google one so you don't understood the problem

sblantipodi said:
the problem is present in all apps, google one and non google one so you don't understood the problem
Click to expand...
Click to collapse
Hey its no problem. It's only that this is the first time you state that you have problems with all apps.
I still don't understand why you have problems downloading apps though. I have tested and do not have this problem BUT I do have the problems with most other 3rd party apps.
Anyway there is a fix that probably will help you. Download "WIFI High performance' widget from the market. Add the widget and enable it. Good luck.
Sent from my Galaxy Nexus using Tapatalk 2

[Q] What's best? Wifi Off when screen is off or Wifi on all of the time?

To start off with; i get good battery life; right now I'm at 1 day 3 hours and I have 39% left.
I was wondering however, does setting the Wifi to go off when the screen is off help significantly on the battery? And if so...is there some other negative issue that I'm not aware of if I set it this way?

I'm pretty sure any sort of data connection will use more of your battery than WiFi will. So if you're always around a strong WiFi connection you probably should leave it on at all times.

MdX MaxX said:
I'm pretty sure any sort of data connection will use more of your battery than WiFi will. So if you're always around a strong WiFi connection you probably should leave it on at all times.
Click to expand...
Click to collapse
That's one of the things that i was wondering about....thanks.

rpavich said:
To start off with; i get good battery life; right now I'm at 1 day 3 hours and I have 39% left.
I was wondering however, does setting the Wifi to go off when the screen is off help significantly on the battery? And if so...is there some other negative issue that I'm not aware of if I set it this way?
Click to expand...
Click to collapse
how the hell are you getting 1 day 3 hours!?!?!??!?! what are your settings? teeeeeell meeeeeeeee!
thanks.

slicetwo said:
how the hell are you getting 1 day 3 hours!?!?!??!?! what are your settings? teeeeeell meeeeeeeee!
thanks.
Click to expand...
Click to collapse
Oh that is funny.
I just do everything everyone else does:
1.) Screen off when not in use
2.) Screen brightness down as much as possible.
3.) Dark theme.
4.) Tasker profiles to turn off wifi when not near my house or work.
5.) Tasker profile to turn off GPS when not actively using certain apps.
6.) Tasker profile to turn off BT when not connected.
I also am probably a light user...the only thing that I do beyond normal phone use is to watch Netflix a slight bit a day and stream Spotify a bit.
I also don't play games except Words with friends.
No FB no locations, no nothing like that.

Wifi off and data off would be most helping when screen off
Sent from my SAMSUNG-SGH-I747 using xda premium

Tips and tricks: improve JB idle battery life.

Confirm the following option is unchecked:
Maps/Settings/Location settings/Report from this device.
If it is checked, uncheck it.
Here's the difference in battery life -
About half the battery drain with the option unchecked.

Thanks for the tip
Sent from my SPH-L710 using xda premium

It looks exactly the same lol. Just one was running on battery longer than the other?

ReapersDeath said:
It looks exactly the same lol. Just one was running on battery longer than the other?
Click to expand...
Click to collapse
What are you talking about? Did you zoom in to see screen on/awake usage? Both are about 7.5 hours of idle time.

I updated my phone to JB and followed the battery saving measures and the battery is dropping very quickly.
Before it could last up to 3 days in standby, now I'll be surprised if it lasts 8 hours.
I'll give it another day then try a factory reset if it does not improve.
Anybody else seeing this?
I have watchdog on the phone and it shows zero cpu off time.

Just install better battery stats, there is also a way to dump the same info in terminal but I don't use it. You are looking for alarms apps cause. It's most likely maps, followed by talk, exchange client, or anything like Twitter, FB,g+,stocks.... but most likely maps location settings
Sent from my SPH-L710 using Tapatalk 2

I have been doing a lot of research and the end result is that JB out of the box will eat your battery and yes disabling the settings under maps does in fact help a lot but there is a lot more you can do to get good life... for starters get the simple stuff out of the way, DELETE FACEBOOK MOBILE APP!!!...and twitter and anything that actively accesses the internet in the background... I know this may sound taxing but it is so worth it if yiu just make a bookmark in your browser and view it periodically than have an always active app... next if you are not in a primarily lte covered area set your phone to cdma only... go into settings and go to data usage and here you can see what is using data in the background I.e. facebook... and go there and check the restrict app box.., disable auto brightness and some have said that if you disable sprint connection manager thing you can do even more.... now that one I cannot be sure about I will post results in the coming days of what I find
Sent from my SPH-L710 using xda app-developers app

OZGBLACK said:
I have been doing a lot of research and the end result is that JB out of the box will eat your battery and yes disabling the settings under maps does in fact help a lot but there is a lot more you can do to get good life... for starters get the simple stuff out of the way, DELETE FACEBOOK MOBILE APP!!!...and twitter and anything that actively accesses the internet in the background... I know this may sound taxing but it is so worth it if yiu just make a bookmark in your browser and view it periodically than have an always active app... next if you are not in a primarily lte covered area set your phone to cdma only... go into settings and go to data usage and here you can see what is using data in the background I.e. facebook... and go there and check the restrict app box.., disable auto brightness and some have said that if you disable sprint connection manager thing you can do even more.... now that one I cannot be sure about I will post results in the coming days of what I find
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
You are pretty much correct the FB app sucks but I never really had much problems with it.
A lot of these tips though in general (not directed towards you) are stupid.
Like someone said a while ago I refuse to gimp my phone to sip a little bit more life out of it. What's the use of having a smartphone if you're not going to use it like one.
I always have high brightness unless its dark out. I broke my syncs intervals up to about 4 hours per sync and have push notifications from twitter and weather.
With those apps all I have to do is refresh when I enter the app having those syncing all the time is worthless unless you're constantly checking every 10 seconds.
I say I get fairly decent battery life granted I'm on wifi most the time and 7-8 hours with about 2 hrs screen on playing HD games youtube poweramp and my background processes.

Well in regards to the act of extending the life of your battery these are simply tips that you can utilize in the event you are someone who is out for extreme amounts of time.... I average anywhere from 13 to 17 hrs of battery life with 100% brightness, wifi 3g all of my favorite apps... instagram xda kik kindle Skype etc. And 5 to 6 hrs of screen on time. .. so these gimping tactics more than double my phones live time and doubles my life.... but hey if you can get to a charger after 8hrs by all means but for the most part I cannot until after 13 but i do in fact appreciate your incite
Sent from my SPH-L710 using xda app-developers app

Also even though you are disabling sone of these apps like google now.... you can still use it your just turning off the background nonsense
Sent from my SPH-L710 using xda app-developers app

OZGBLACK said:
Well in regards to the act of extending the life of your battery these are simply tips that you can utilize in the event you are someone who is out for extreme amounts of time.... I average anywhere from 13 to 17 hrs of battery life with 100% brightness, wifi 3g all of my favorite apps... instagram xda kik kindle Skype etc. And 5 to 6 hrs of screen on time. .. so these gimping tactics more than double my phones live time and doubles my life.... but hey if you can get to a charger after 8hrs by all means but for the most part I cannot until after 13 but i do in fact appreciate your incite
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
what rom and kernel are u using

Even with changing that setting in Maps I still am not getting the same battery life as I did with ICS. Maps is still coming up as my most used app when I check battery usage even though I rarely use it. Wonder if it may be Google Now causing Maps to keep running.

nabbed said:
What are you talking about? Did you zoom in to see screen on/awake usage? Both are about 7.5 hours of idle time.
Click to expand...
Click to collapse
Oh wow. Sorry from my phone I couldn't zoom in. I see now lol. Thought I saw 90 and 89 or something like that

I had the Maps setting turned off for a few days and also had A LOT of stuff disabled, but unfortunately my battery life (and my wife's as well) wasn't as good as ICS, and quite a bit worse actually.
Sadly, today, it looks like I figured out what the killer is:
Google Now.
This morning, 100% charged, I turned it off. My wife (who still had it on) and I were out and about together for about four hours, we both barely used out phones for that time. When we got home I checked both phones: I was at 96%, she was at 80%.
The only difference that I hadn't already accounted for:
Google Now.
So, unfortunately, it looks to me like one of the two biggest reasons for wanting JB in the first place (Butter being the other of course) turns out to be a big battery hog I don't yet know if there's maybe some setting within it that is a specific problem or if it's the whole thing in general... maybe you just need to disable a card or change an update frequency or something (I didn't touch any so I'm running whatever the defaults are), I don't know yet... but all indications are that's where the problem lies.
That, my friends, sucks.

Well since my phone has calmed down I am getting 13-16 hr easily. Brightness maxed of course and about 4-6 screen on time I will never cripple my phone. Hell I bought it so I can use not to look at. Lol thanks for the post of this though if I'm ever I. A die hard , situation I'll know what to do
Sent from my SPH-L710 using xda app-developers app

Orbiting234 said:
Even with changing that setting in Maps I still am not getting the same battery life as I did with ICS. Maps is still coming up as my most used app when I check battery usage even though I rarely use it. Wonder if it may be Google Now causing Maps to keep running.
Click to expand...
Click to collapse
Google Now uses the "Report from this device" and "Enable location history" maps location settings to determine your driving patterns so it can suggest alternative routes and report traffic delays. Disabling "Enable location history" will disable the driving pattern suggestions completely.
FWIW Settings | More settings | Mobile networks | Network mode
Changing from "CDMA" to "LTE / CDMA" has gained me better battery life. My wife also noticed the same.

(To save time, I'm cutting & pasting my post from another similar thread.)
> http://forum.xda-developers.com/showthread.php?t=1963689&page=3
"I have had my Galaxy S3 for a week now. Battery life stabilized after the initial syncing, etc. I updated to Jelly Bean v4.1.1 two days ago, and battery life didn't seem noticeably different. However, that was until today. My phone was off of the charger, around 10AM, and had < 5% charge by 4:30PM. I was very busy, so I was hardly using the phone all day. It was in my pocket or on my desk most of the time. One of the only settings I changed last night, was enabling 'Use wireless networks' and enabling 'Location and Google search' under 'Location Services' in 'Settings'. I just disabled both settings, and will see if the battery drain is any less tomorrow. Also, Google Now was off, and was never enabled on my phone. I'll try to post the results, if at all possible..."
So, for me, it seems to be Location Services may have caused my poor battery life, and was definitly not Google Now, as it was never enabled. I'll try using the phone with the settings off, and see if that changes anything...

Toney Starks said:
what rom and kernel are u using
Click to expand...
Click to collapse
Stock stock stock jellybean ota... that's it
Sent from my SPH-L710 using xda app-developers app

I do love Jelly Bean; as it is ICS only improved or enhanced. But battery life has definitely taken a hit. I can barely make it through 24 hrs. On ICS I could do a day and a half to two days with really light use. I've tried just about everything mentioned with little change. Good thing I have an extra battery. Thank you Samsung for making a phone with a user replaceable battery.
Thanks for all the ideas/suggestions anyways,
El Mono

I noticed the huge difference as well. I was walking around Chicago yesterday and not using my phone. After 4 hours I looked and my battery was at 50 %.
Sent from my GT-N8013 using XDA Premium HD app

Battery Life Question

I have happy with my battery life but only getting about 12 hours a day. And I read people getting a day and a half? That's ridiculous! I am currently running Jedi XP 8 with Perseus, I kill my apps instantly after use, use full brightness and turn off data when I'm on wifi. So what else? Thanks in advance.
Sent from my SGH-I317 using xda app-developers app

Maybe your full brightness has something to do with that.
Edit: I think this belongs in q&a s3ction.
Edit 2 : kernel overclocked?
Sent from my SAMSUNG-SGH-I317 using xda premium

Kmanblazzer said:
I have happy with my battery life but only getting about 12 hours a day. And I read people getting a day and a half? That's ridiculous! I am currently running Jedi XP 8 with Perseus, I kill my apps instantly after use, use full brightness and turn off data when I'm on wifi. So what else? Thanks in advance.
Sent from my SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
Screen brightness es are usually the ones killing the battery.
Full screen brightness is probably the reason why

Kmanblazzer said:
I have happy with my battery life but only getting about 12 hours a day. And I read people getting a day and a half? That's ridiculous! I am currently running Jedi XP 8 with Perseus, I kill my apps instantly after use, use full brightness and turn off data when I'm on wifi. So what else? Thanks in advance.
Sent from my SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
Absolutely. That screen brightness will kill it every time..
Current Devices: At&t Samsung Galaxy Note, Verizon Samsung Galaxy Nexus, Asus Google Nexus 7 Super Tablet
Current Roms: Jedi XP 9 (Note 2), AOKP (Galaxy Nexus), Nexus 7 Stock

z28tovette said:
Maybe your full brightness has something to do with that.
Edit: I think this belongs in q&a s3ction.
Edit 2 : kernel overclocked?
Sent from my SAMSUNG-SGH-I317 using xda premium
Click to expand...
Click to collapse
Yes the kernel over clocks
Sent from my SGH-I317 using xda app-developers app

Kmanblazzer said:
Yes the kernel over clocks
Sent from my SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
Kernel oc'd can drain battery aswell.
Sent from my SAMSUNG-SGH-I317 using xda premium

Coming from someone who LOVES bright screens... unless you're nearly blind, there's absolutely no reason why anyone needs to constantly be running their Note 2's screen at full brightness. Auto-brightness is extremely efficient, and if you don't like how the phones native auto-brightness feature manages things, there's many third party apps which can do it better. Full brightness will kill anything on a battery, from a laptop to a cell phone.

Very true ^^^^
Sent from my SAMSUNG-SGH-I317 using xda premium

Bsmith0731 said:
Absolutely. That screen brightness will kill it every time..
Current Devices: At&t Samsung Galaxy Note, Verizon Samsung Galaxy Nexus, Asus Google Nexus 7 Super Tablet
Current Roms: Jedi XP 9 (Note 2), AOKP (Galaxy Nexus), Nexus 7 Stock
Click to expand...
Click to collapse
This means nothing, you have the freaking phone in airplane mode, of course your phone is going to last forever like that

walie said:
This means nothing, you have the freaking phone in airplane mode, of course your phone is going to last forever like that
Click to expand...
Click to collapse
It means everything. I'm trying all methods..
Current Devices: At&t Samsung Galaxy Note, Verizon Samsung Galaxy Nexus, Asus Google Nexus 7 Super Tablet
Current Roms: Jedi XP 9 (Note 2), AOKP (Galaxy Nexus), Nexus 7 Stock

Full brightness can cut your screen on time in half. There is no reason to turn off data when connecting to wifi, it's already off. This is android, constantly killing apps will waste your battery even more.

simonxliu said:
Full brightness can cut your screen on time in half. There is no reason to turn off data when connecting to wifi, it's already off. This is android, constantly killing apps will waste your battery even more.
Click to expand...
Click to collapse
Why is that killing apps right after use drains your battery? I have come from iPhone so I thought it would just increase it. Also, since apps are running in the background why wouldn't background apps killing your battery? And if I shouldn't kill them right after use, when should I kill them?
Sent from my SGH-I317 using xda app-developers app

I get a day and a half on full brightness... But not much screen on time.
Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

Kmanblazzer said:
Why is that killing apps right after use drains your battery? I have come from iPhone so I thought it would just increase it. Also, since apps are running in the background why wouldn't background apps killing your battery? And if I shouldn't kill them right after use, when should I kill them?
Sent from my SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
Yeah no clue why he said that. Clearing your ram before you turn off screen increases your battery by a lot.
______________________________________
Phones: iPhone 4 - > iPhone 5 - > Note 2 (Always on AT&T)
ROM: International N7105XXDLL4 by miscom
Kernal: Perseus alpha30.1
A lot of bloatware removed.
Screen on time after normal charge: 7-8 hours always.

i'm very pleased with battery life on my device. i'm using a deodexed, rooted stock ATT 4.1.2 ROM, with stock kernel, Power Mode off, brightness set to about 40% and screen mode set to Natural. i don't use task killers, battery managing apps, etc. my usage is mainly email, calls, web surfing and listening to music (when i have time).
on an average work day, i can get 16-20 hours per charge with 6-9 hours screen time, about 150 emails (4 exchange accounts all set to push 24/7) and 35-90 minutes in phone calls. at the end of my average day i'll have 15-25% battery left before it's on the charger again. there are days when my usage is above average and battery life will be lower. fortunately, for me, i have wifi available and strong phone signals where i work. the pictures below are an example of an average workday: 15 hours, with 8 hrs screen time, 62 minutes of call time and there's 31% battery left. most of the screen time was related to reading/replying to emails, web browsing and texts.
the OP doesn't mention their expectations beyond getting 12 hrs on a single charge and how he/she uses the device on a daily basis. that will surely factor into their respective experience.

Kmanblazzer said:
Why is that killing apps right after use drains your battery? I have come from iPhone so I thought it would just increase it. Also, since apps are running in the background why wouldn't background apps killing your battery? And if I shouldn't kill them right after use, when should I kill them?
Sent from my SGH-I317 using xda app-developers app
Click to expand...
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Background apps aren't necessarily doing anything. This isnt windows, Android is unix based, unused ram is wasted ram. The system loads apps into the ram so you can switch back and forth easily.
An app isnt constantly doing stuff in the background unless it is intended (like utorrent or music), or the app is badly made(I'm looking at you weather channel). Your ram is always on, no matter how full it is it will always use the same amount of power, when you're in deep sleep your apps are frozen and not actively running. Killing all your apps just means the next time you use the app it has to be read from internal storage and loaded into the ram instead of already being there in the first place, this actually uses more power. Some apps wont even stay closed and will immediately reopen anyways.
Tl; dr Android has ways of freezing apps when not in use, killing apps just means they have to be loaded again on next use which uses power. Some apps are broken and wake up all the time, use betterbatterystats to help find them.
The only solution is to use something like betterbatterystats and find the crap apps that are breaking deep sleep.

simonxliu said:
Background apps aren't necessarily doing anything. This isnt windows, Android is unix based, unused ram is wasted ram. The system loads apps into the ram so you can switch back and forth easily.
An app isnt constantly doing stuff in the background unless it is intended (like utorrent or music), or the app is badly made(I'm looking at you weather channel). Your ram is always on, no matter how full it is it will always use the same amount of power, when you're in deep sleep your apps are frozen and not actively running. Killing all your apps just means the next time you use the app it has to be read from internal storage and loaded into the ram instead of already being there in the first place, this actually uses more power. Some apps wont even stay closed and will immediately reopen anyways.
Tl; dr Android has ways of freezing apps when not in use, killing apps just means they have to be loaded again on next use which uses power. Some apps are broken and wake up all the time, use betterbatterystats to help find them.
The only solution is to use something like betterbatterystats and find the crap apps that are breaking deep sleep.
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Thanks, this helps a lot!
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Dr. Evo said:
Coming from someone who LOVES bright screens... unless you're nearly blind, there's absolutely no reason why anyone needs to constantly be running their Note 2's screen at full brightness. Auto-brightness is extremely efficient, and if you don't like how the phones native auto-brightness feature manages things, there's many third party apps which can do it better. Full brightness will kill anything on a battery, from a laptop to a cell phone.
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Ive tried using the Auto feature but when I enable it, it dims the screen so I can hardly see it. Ive seen screenshots of other users screens with the 'Auto' enabled and they are much brighter......Am I missing another setting somewhere else?

Simon. You are absolutely correct..
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Chasoscar said:
Ive tried using the Auto feature but when I enable it, it dims the screen so I can hardly see it. Ive seen screenshots of other users screens with the 'Auto' enabled and they are much brighter......Am I missing another setting somewhere else?
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As I said, there are all sort of third party apps out there, that manage screen brightness and most do it better than the native feature. This is the one I use... although I have the paid version. Best auto-brightness I've ever used on any phone...
GOOGLE PLAY: Lux Auto Brightness - Free