yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] =RBL=:
Maybe its got something to do with your Wifi signal. If it constantly looses signal and look for it that would drain your battery. It seems like my Wifi signal is quite strong and SGS2 is constantly connected to it.
[Galaxy S II General] =dave=:
linksys wrt54gl, the king of all routers ;)
[Galaxy S II General] Furbious:
Netgear dgnd3300v2 here, interestingly I didn't see the bug til I upgraded to KE1 and KE2, but I'm not sure if that's a red herring or not.

I also run juicedefender ultimate, and even when that turns wifi off it still doesn't stop the problem - I can see the device waking every minute or so overnight.
[Galaxy S II General] muSPK:
I got a D-link named: DI-524

I got the issue that something is draining my S2 battery really badly, but I think people need to stop staring blindy on how much android OS drains the battery.

For me its always the display that is the highest drainer, but my battery life is very poor.

I can leave the phone idle for 6 hours and when I come back I could have lost as much as 15% of the battery life.

Sorry for my poor english skills :p.
[Galaxy S II General] Quist:
I have the D-Link DIR-655 and have a very strong signal. Others with this same router have tested with other routers and not had the same problem.

If there is a Netgear router that also triggers the problem, it would seem to indicate something the SGSII wifi driver is doing.

If there are problems with that driver, it would make sense that other people are experiencing signal power issues.

I think at this point that most of us have confirmed that the wifi power sleep setting has some kind of error in it.

Apparently, the 2.3.4 on the Nexus S addressed something similar. Sounds to me like we need to get Samsung to rectify this.

I have another router, but am loath to reinstall all my settings and servers just to get my SGSII to work with it. While waiting a fix, I'll simply stay off of wifi (I get 10Mbs down on 3G anyway).
[Galaxy S II General] walda:
please watch the difference between battery drain and high aos%

the aos doesnt matter, the battery drain does.

so ppl compare routers with high battery drain (10%/h)

sent from my SGSII via T*patalk
[Galaxy S II General] Furbious:
As a previous poster mentioned, Samsung won't fix it if they don't know about it - why not join us by logging a service request, the more people moan, the more likely they'll fix it.
[Galaxy S II General] tebs:
Ive got the same battery drain issue too but not quite as bad the 10%/hr which I had the first few days and being reported. Getting 5%/hr when idle with or w/o wifi. Just for the record I am using a cheap n nasty freebie Thomson 585v7 form O2.
[Galaxy S II General] cih997:
I got i9100 few days ago. Installed some apps, widgets, etc.

Battery was poor, 12 - 18h.

I've upgrade soft from KDD to KE2. Battery still poor.

WiFi sharing proccess took 16-25% battery. Even if it was turn off.

I tried http://xdaforums.com/showthread.php?t=1081368 but still problem appear.

As previous guys mentioned, I used Bloat Freezer and freeze wifi sharing and wifi sharing manager. It seems this resolving problem quite well.

(Before use Bloat Freezer U need ROOT system: http://xdaforums.com/showthread.php?t=1056334).

Waiting for better solution.
[Galaxy S II General] airwater9:
I agree....Lets all get onto Samsung to put right what they should have. Although they surely visit XDA we should be taking the issue to them directly. We're not rooting the phone so it's something they should take care of and not necessarily something that we should be going to XDA for especially when we are onto page 70 of this thread and got pretty much nowhere.
[Galaxy S II General] :
router DIR-855

power saving disabled

wifi off

battery @ 86% after 7h 25m

android os 56 % (40m 38 s)

exchange active sync ist set to push

no gmail sync

phone was most of the time in standby.
[Galaxy S II General] DocRambone:
Try with wifi on... ;)
[Galaxy S II General] jedster:
Apologies for the long post, but I thought I should put in my 2p worth.

I think there are a lot of red herrings on this thread, possibly including the android OS%. I've got consistently high 19-26 OS%, and yet my battery life is good (currently on 17h idle/background sync with 68% battery remaing.

We need everyone to do the same test and post what percentage battery they lose, i.e. perform a full charge with the phone OFF (approx 4 hours), then turn it on and leave it idle for say another 4 hours, then we can all report the % battery drop and see who has high, medium and low, and compare the settings for each group to rule out apps/settings.

fyi - I've had wi-fi on and off (wi-fi policy set to always on, and seems to actually use less battery then 3G, netgear router with strong reception), have the wi-fi sharing service running, haven't rooted/frozen or uninstalled anything.

I have one IMAP email syncing, gmail for calendar and contacts, backup settings - enabled, no sdcard installed.

The only changes i've made are: reduced the update period for sky news and ap widgets, disabled samsung apps notification, disbled My location-> use wireless and use GPS, enabled automatic display brightness (after latest firmware upgrade) and possibly a few other bit I can’t remember.

p.s. my vote is for samsung apps notification (Application->samsung apps-> set to off) or "My location" being left on and used by maps or Latitude (Location and security-> deselect "Use wireless networks" and "Use GPS", you turn them on when needed.
[Galaxy S II General] Shocky2:
Did a factory reset but this time said no to all google information sharing and things seemed to have improved.

Android OS instead of 35% is now down to 9% after a day which is allot better and display is at 47%, time will tell if it increases but it's not dropping much at all when idle.

After about 21 hours it reached 29% battery with some heavy usage so I'm quite happy with that.
[Galaxy S II General] =RBL=:
I said no to google tracking my phone and data from the start. I would have thought that its common to disable that 'feature'
[Galaxy S II General] fscherz:
I had same problem, updated yesterday via Kies to new firmware (XWKE2) and then installed Launcher Pro+ and now my OS is back to 3% (from >60%, p.s.: I use BT, Wifi, have Twitter, 4 Mailboxes including Exchange ...).

Ok, do not 4get to reboot after you installed everything and changed settings to remove TwLauncher from process list...

The Display is eating now 72% (I use Alarm Clock background clock not to lock phone)
[Galaxy S II General] Shocky2:
Depends, when people are in a rush they tend not to read this stuff.

But it's the only thing I did differently, maybe in my case all it needed was factory reset.
[Galaxy S II General] Tough.Enough:
I do confirm that battery calibration help in this situation, Android OS consumption drooped from 80 to 45 after I made the calibration yesterday. Well, its still sucks but at least the phone is more usable
[Galaxy S II General] DocRambone:
Looking more to the DIR 655 battery drain; iphones, pre's etc has the same issue with dir 655... So i guess the router is to blame for now.

So,

DO NOT USE DIR 655 WITH SGS 2
[Galaxy S II General] jjs87:
my usage of today

3 hour 12min screen on

2min of calling

syncing of gmail,twitter,facebook,whatsapp,gtalk

some browsing

45min of music listing

Still dont like how much the system processes eat away...

also been monitoring all system processes for what its worth.

system processes and system eat most by far. of system processes the proces suspend eats alot its active all the time and uses +/-3% of the cpu and never stops. and events/0 is the same also sits arround 2-3% cpu usage all the time.

System only seems to be using 10% when phone is in actual use (screen on)

then again i never monitord my old android device so i dont know if the above is normal or abnormal.
[Galaxy S II General] dryspuri:
These are my satisfactory results this its on ke2, wifi off, samsung app s frozen, phone is rooted
[Galaxy S II General] TrysT:
I had the same problem as everyone before KE2 came out,

Now I am extremely happy with my battery life. I'm a light to moderate user, not rooted (...yet), wifi off until i need it. Left it overnight and it only dropped 1%

Before I could only get a days worth of usage, now its at 33% and will last until I get home from work. (If I don't play too much on it now.. ;)
[Galaxy S II General] cmd512:
Told ya it was something specific to you. :D Glad you found the bugger though!
[Galaxy S II General] MakeYourOwnTacoNight:
Still not sure about all this. I have a drain issue and have been testing while I sleep. Only once I've noticed good battery life - left the phone on idle overnight and it was at 98% after 8 hours. The night before it dropped to 70% over 6 hours with the same settings/apps.

Interesting to note, my Android OS generally reports quite low percentages (5%-15%). The only night I saw it high (50%) was the night it performed really well.

The problem I'm seeing is that when I look at the battery graph, I can see my phone is constantly 'Awake' when it was idle with no usage at the time. I've also noticed this in screen-shots from other people having issues.

Maybe I have an entirely different issue, a rogue app or something. Though my Galaxy Tab runs pretty much an identical setup (including cellular network) and has no issues. I'm going to try a hard reset.
[Galaxy S II General] NIK516:
dam just upgraded to ke2 and now my os shot back up to 60%, I originally had the problem but it went away, but now it's back.

I think I'm just going to root and freeze a lot of things:(
[Galaxy S II General] vimto25:
Im on ke2 and don't seem to have any problems, wi fi on off when screen off.over 5 hours of use (screen time) is quite heavy playing games internet browsing txing calls. Will low-mod use i get around a day and half now for a android device that's good from my point of view
[Galaxy S II General] CandyAndy:
Was wondering if you are rooted?

I have wifi sharing pretty top high consuming my battery. I haven't done any wifi sharing.
[Galaxy S II General] shopcity:
How many days on standby are you getting?
[Galaxy S II General] cih997:
My solution about wifi sharing problem http://xdaforums.com/showpost.php?p=13857010&postcount=645

Works for me pretty well. Battery consumption is about 5-6 times less than before.
[Galaxy S II General] vimto25:
I am rooted with a few useless apps froze as i see pointless them running, wi fi sharing is froze as i never use, tbh my battery life hasn't changed a great deal after rooting and freezing a few apps its just took the edge of it, whilst in idle it uses nothing as i go bed at 12 nd when im up at 7 I've either still 100% or 99% on battery. I feel games the biggest drain on the phone.
[Galaxy S II General] vimto25:
Not sure but my.phone consumes next to nothing in standby, if i charge to 100% before i go bed when i wake up its normally still 100% or 99% still in it.i now use wi-fi instead of 3g as i felt that is easy a drainer as i didn't get these results using 3g, wi fi set to off when screen off as always on i notice drain.
[Galaxy S II General] DrGinge:
ok, for me something has changed this morning - 1hr 22m on battery, including receiving a phone call and still 99% charge left - which is a dramatic improvement.

This morning I disabled lots of stuff, including:

Location and Security->My Location->"Use Wireless Networks" is now off

Accounts and Sync->Background Data is now off

Privacy->Back up my data is now off

Also under Applications->Running Services I killed a lot of services including:

Wi-Fi sharing manager

Software Update

DRM Manager

and some others I can't remember.

I've just re-enabled Background Data as I want to still receive my email, so will see if this affects drain.
[Galaxy S II General] vimto25:
What's drm manager??
[Galaxy S II General] DrGinge:
I imagine it allows you to play any protected-rights media - not an issue for me, so willing to sacrifice it for now..not that I imagine it effects battery life.
[Galaxy S II General] NBB823151:
Battery Drain

I got an exchange over the weekend, installed the update, and it seems it is starting to settle down to about 5% per hour in normal use, so i have background data enable for two pushmail accounts, location stuff off and all programes that I can set for updates are either manual or every three hours, several texts and calls per hour and some internet. I am really now of the opinion that there are some dud batteries out there and maybe a few issues in O/S, though they were probably helped in the firmware updatein the first batch as I and obviously many on the forum have this issue.

will update in a few days again
[Galaxy S II General] El Salvador:
I had a very nice exerience last night with my battery.

After the firmware update to KE2, I did a factory reset and used 3G to set up all the accounts, except Samsung apps and the Facebook/Twitter social hubs. (I use the official Android apps from the market)

After charging the phone to 100% I did a reboot again, put the phone away and went to sleep. The phone finally went idle during the night and in about 7/8 hours my battery was at 98%.

Now I used 3G again to check my emails, did some browsing and whatsapp and the battery drained from 98 to 91%, which is again pretty fast I think. I've turned 3G off and put it away again to see if it goes idle again.

I have autobrightness turned on and I haven't put Wifi on yet.
[Galaxy S II General] dan13l:
After doing the reset last night, and charging over night, I'm currently at 85% battery after 3 1/2 hours of use. Android OS has only used 5 minutes of CPU time. Display is the biggest battery consumer by a long shot (just as it should be).

Those 3 1/2 hours included tweeting, reading blogs, reading XDA devs (of course) and listening to 40 minutes of bluetooth streamed podcasts.

Conclusion, so far, so good.

I've frozen all the stuff I don't want (hopefully we'll get a custom rom at some point with this bloat removed) and I've got the wifi location setting turned off.

The big BUT though, is that I've not turned wifi on at all yet since I did the reset. And I can't really survive with the phone just on 3G networks. So when I get home from work, the next step is to re-enable wifi and see if Android OS starts to shoot up, and battery dips.
[Galaxy S II General] darkalchemist:
Can i ask what your brightness setting was?
[Galaxy S II General] DrGinge:
I've got wi-fi always on (doesn't switch off with sleep) and now have background updates enabled and still getting much better results today - something I've switched off in my post above seems to have done the trick....I have a suspicion it was either the wi-fi manager or wi-fi location stuff.
[Galaxy S II General] acb77:
Had the device for 4 days now. First charge I thought "oh no this is woeful" - battery died within 6 hours (full charge). System update done shortly thereafter and batt life seems to be improving with each charge - still at 70% after 8 hours now - much much better than what I was getting out of my iphone4.

Running live wallpapers + exchange and gmail constant push. Also running juice defender.
[Galaxy S II General] dan13l:
I tend to use the Brightness Level widget to set it to 0 when I'm inside - no real need for anything more! Then I auto it when I'm outside.

Here's an interesting finding: I was playing with Autostarts, and noticed that under Wifi State Changed, there's an entry for Wi-Fi Sharing Manager. If my understanding is correct, that means Wi-Fi Sharing Manager is launched every time you toggle wifi on or off, which could explain why it's popping up and draining battery for people.

Another entry is MTP Application, under Screen Off. Clutching at straws, but maybe this could be contributing to the device's inability to sleep properly (if that's what the issue is).
[Galaxy S II General] nickbarbs:
Hi everyone.

I just wanted to tell you that I am experiencing fantastic battery life, truly unbelievable, and I have tons of stuff running at once, sync, gmail, etc. Flight tracker, 3g watchdog, google talk, all of this is on. live wallpapers also on. brightness at 75%. I can go a full day of heavy use, and I mean movies, internet browsing, mp3 listening, with screen on at 75% and I still have about 30-40% of my battery left over.

A big difference I can tell between my setup and yours is that off the bat, about 10 minutes into picking up my new phone when it had KDA a few weeks ago, I had to do a factory reset because i was getting crashes in my framework.apk. this was a few weeks back. A few others have reported a factory reset makes your battery life cleaner. I could indirectly confirm this.

I have since loaded my phone with WKE1 rom. I did not do a data wipe, but I have rooted. I am not on KE2 because of the Orange UK bugs present in that rom.

Here are some screenshots of this morning's usage so far. I recommend you don't give up on this phone. it is a fantastic, fantastic device.
[Galaxy S II General] DocRambone:
Small update:

12 h 5m on battery, 64% battery left

Display 1 h 15 min

Android os 23 m 40 s

Voice call 11 min

etc

Idle drain around 0.5 % / h

On a very slim rom.

Ok so far
[Galaxy S II General] DrGinge:
How do we do a factory reset? I'm willing to give it a try.
[Galaxy S II General] DocRambone:
Settings/privacy: factory reset
[Galaxy S II General] rocketpaul:
when will you bless us with a rom doc?:D
[Galaxy S II General] Dirky:
I noticed this "Wi-Fi sharing" running even though I have wifi turned off. How do I disable this?
[Galaxy S II General] rwc3b:
Incredible. You are at 99% overnight and I'm down to 56%. No push, no wifi, anything. defect?
[Galaxy S II General] DocRambone:
Lets see, i be very busy next few days, have made a number of betas already, but this battery bug prevented the release.

Should be up very soon tho.

I have a highly optimized slim rom that runs very well now.
[Galaxy S II General] vimto25:
Now that is very bad, maybe a bad battery if it isn't software,something isn't right,this phone should have a big standby time so everyone should expect good results if they have nothing being pushed in the back ground
[Galaxy S II General] mb:
I've got 3d 13h 53m 14s on battery (with 2% left), which I think is quite remarkable. Device is unbranded and rooted.

Android OS - 41%

Android System - 20%

Cell standby - 11%

Phone Idle - 8%

Display - 8%

Email - 7%

Voice Calls - 3%

If it helps, the biggest drop from when fully charged was when I had Bluetooth switched on for a couple of hours. It dropped about 20% from what I remember.

Shame you can't (yet) make the Power Saving mode permanent and nag-free. Should be default really.
[Galaxy S II General] dan13l:
Doc - two questions: have you started using wifi again with those stats, or is that with wifi off all the time? And do you need any beta testers for that rom? ;)
[Galaxy S II General] :
what battery status app are you using?
[Galaxy S II General] mi3x:
It's not the router I have a linksys and experience the battery drain. Unplugged it at 10 30 this morning and now I have 53 % left. I'm on ke2. All bloatware frozen including wifi sharing and all samsung crap.

Weird is that my track appears as a memory hog though I never used it.

I'm planning on a wipe and a fresh start until a solution pops out.
[Galaxy S II General] dan13l:
What's the Time On stat for your display?
[Galaxy S II General] cih997:
As I wrote few post ago this is good solution for me http://xdaforums.com/showpost.php?p=13857010&postcount=645
[Galaxy S II General] mi3x:
Display 8%? Hey buds, stop posting idiotic usage to induce panic when you hold your phone in a drawer for 3 days...

Le: 2h40min display on.
[Galaxy S II General] DocRambone:
Wifi on 50% (not on dir 655 tho)

No beta testing right now...
[Galaxy S II General] EmilianM:
where exactly I can see the average "Idle drain xxx % / h" ?
[Galaxy S II General] EmilianM:
Could you tell us the results of the "factory reset", is this improving the battery ?
[Galaxy S II General] troed:
Anyway, I had nice batt life with juice defender on but still improves when running "android booster" from time to time, closes automatically all unnecessary open apps and processes, no freeze by that (since 5.30 this morning working with SGS II and still 64%, HSPA on, BT on, constant email/FB sync, optimizing with android booster every time I send SGSII to idle)
[Galaxy S II General] El Salvador:
Doesn't the 8% mean 8% from the total time, in this case 3 days and 14 hours? If so, that would mean his display was on for roughly 6.5 hours during this period. If I use my display for 6.5 hours non stop after a full charge, my battery would be totally drained. However, his display usage is spread over 3 days which sounds really impressive to me.
[Galaxy S II General] dan13l:
No, it doesn't mean 8% of the 3 days 14 hours. It means that his display accounts for 8% of the overall drain on the battery.
[Galaxy S II General] DocRambone:
Manually, check idle time and look at % battery drop.
[Galaxy S II General] El Salvador:
Ah I see, well now everyone may neglect my post
[Galaxy S II General] NBB823151:
quick update on phone number 2

down to 58% from 9.00 AM with actually not a great deal of use 3 10 minute calls dozen texts 2 minutes web and my email which I have set to 5 minute updates as push was "pushing it "and some setting adjustments.....

I am not giving up because it is such a great phone and true I still need the battery to have a few cycles however something is really amis here and its probably something quite simple just havn't found it yet
[Galaxy S II General] dan13l:
@NBB823151 - wifi switched on?
[Galaxy S II General] kreoXDA:
I am more interested to hear WHAT TIME ZONE that 9am was in. It is an international forum, where I am it is only 10:12am right now (Eastern Standard Time) ;)
[Galaxy S II General] NBB823151:
No WiFi and apologies my time zone is uk GMT +1

The stupid thing is if I untick the "background data enabler" i can see battery would last a long time....only prob is that you cannot sync mails with it unticked
[Galaxy S II General] mb:
Not sure if you're attempting some humour, but my "idiotic usage" (whatever that means) says this when I tap Display 8%:

1hr 36m 53s
[Galaxy S II General] mi3x:
And don't you find this funny? :p You had your screen on for 1 hour and a half in the last 86 hours. That's definitely a "hidden-in-the-stash" phone for me.

But maybe not all of use the SMARTphone as supposed to be used. OFC your baterry should last forever. You might as well get a nokia with mail option.

LE: sorry if I may seem a bit acid, we are trying to figure out here what's killing our baterry, so your statistic is also welcome, but we need at least a normal usage representation of the phone. I'm sorry again, nothing personal, I'm a bit upset with this otherwise brilliant phone.
[Galaxy S II General] slyydrr:
To be fair, there's really no "normal" usage for a phone. Everyone is free to use their phone how they please. I agree it's not typical or standard, but that's his phone use. Even then, it provides us with some pretty good information in that it implies with minimal screen use, the phone can actually survive a few days if things are setup well.
[Galaxy S II General] =RBL=:
I now know why some of you may see the big 'Android OS' procentage in your battery stats. I know see it too. It shot up from the usual 12-13% to around 32% after I set up my email app to check for emails regulary. I only noticed today that for all my email accounts (got 6) never had any notifications, so went on to settings for each account and set it up to check for emails every 5-10 min (depending on the account). 'Android OS' shot up from 12% to massive 32% in 2 hours.

BUT

my battery life is still a lot better than some of people posting here. Even after that change I still got 11h 4min on battery so far and still 62% left. So it is not a resolution to your problems but maybe it could help you to locate the problem. I do hope so.

HTH
[Galaxy S II General] mi3x:
What email app do you use? Samsung default?
[Galaxy S II General] =RBL=:
Yes, samsung default (not gmail one though)