yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] dan13l:
Here's the result of a full day's use. Fairly light, had a busy day so not a lot of time spent fiddling. But a few voice calls, Bluetooth audio playback, tweets, etc.

I'm at 62% right now. Which I think is pretty much spot on.

The next step is to turn my wifi back on and see if battery plummets and android OS use shoots up. Right now it's at 26 minutes, which is a fraction of the total time off charge.

Although weirdly, time without a signal is still 100% in cell standby.

Edit: first interesting thing to note - as soon as I turned wifi on, the Samsung updates icon appeared telling me there's an app update available. So that clearly never runs on the cellular connection.
[Galaxy S II General] :
Hi there,

I haven't read through the entire thread, so I don't know if my problem has already been answered. I'm experiencing the same problems with the android os, as it is accounting for 75% of the battery drain. However, it only occurs when I'm at home.

On the screen capture below, the first five hours show an acceptable drain (I lost about 12% in that time), which occurred while I was at the university. Immediately when I got home, the drainage exploded (where the curve suddenly declines more rapidly).

Hi there,

I haven't read through the entire thread, so I don't know if my problem has already been answered. I'm experiencing the same problems with the android os, as it is accounting for 75% of the battery drain. However, it only occurs when I'm at home.

On the screen capture below, the first five hours show an acceptable drain (I lost about 12% in that time), which occurred while I was at the university. Immediately when I got home, the drainage exploded (where the curve suddenly declines more rapidly).

dicktaid.com/sgsii2.jpeg

dicktaid.com/sgsii2.jpeg

(I'm apparently not allowed to post links, so I'm sorry for the inconvenience of tedious copy/pasting).

I have been fiddling with the device ever since I received it last week, and besides trying to upgrade the firmware using the idiotic Kies software for hours, which I finally solved with ODIN, this battery issue is really and truly frustrating.

I've tried doing a factory reset four times, I've upgraded the firmware to KE2, but the ****ty issue persists. The SGSII is draining the battery like a woman drains your wallet. It's irksome.

I have been fiddling with the device ever since I received it last week, and besides trying to upgrade the firmware using the idiotic Kies software for hours, which I finally solved with ODIN, this battery issue is really and truly frustrating.

I've tried doing a factory reset four times, I've upgraded the firmware to KE2, but the ****ty issue persists. The SGSII is draining the battery like a woman drains your wallet. It's irksome.
[Galaxy S II General] DocRambone:
Do you have a dlink router?, Dir 655?
[Galaxy S II General] :
Dir-635, yes.
[Galaxy S II General] DocRambone:
Welcome to the Dlink DIR Battery Drain gang :)

You have to change router brand, the dlinks seems to kills batteries on more than the sgs2...
[Galaxy S II General] RogerPodacter:
the most important stat, what is your display-on time? that is a criticial stat to include.
[Galaxy S II General] kreoXDA:
I once woke up in the middle of the night and witnessed how my two deelinks sneaked up on my precious phone, ripped off the battery cover and proceeded to beat the amps out of the battery with their little ugly baseball bat - shaped antennas.
[Galaxy S II General] :
Goodie, just what I needed. Hold the welcome wagon.
[Galaxy S II General] sohanlon07:
Eleven and see half hours. Moderate use. Pretty ****.
[Galaxy S II General] chukkie:
Freeze wifi sharing.. Helps battery life.. Worked a treat for me. 1-2% per hour idle drain..
[Galaxy S II General] TheGhost1233:
Things are getting mixed up here. There is the android os process, which going by my old phone (htc desire) shouldn't even be in the list. As far as I know everybody suffers from this and the more you use the phone the less you notice it. It does however affect stand by time significantly. People who say they don't have this issue but do have android os in the list are expecting to little of this phone.

Second there is the wifi sharing issue. For me it only occurs when wifi is turned. The fix for me is manually killing the process.

Last there is the router specific issue which I don't have.

Of the three it looks like the android os one has the smallest drain but that one bugs me the most and I haven't seen a reasonable fix for it yet.
[Galaxy S II General] sohanlon07:
Can I still send files OTA with wifi sharing disabled?
[Galaxy S II General] kreoXDA:
You have had the phone and the screen ON for 3.5 hours(!!!!), doing heavy cpu and modem/data intensive stuff on it.

Upgrade to latest firmware.

Make sure your screen is set to low brightness.

And let you battery condition itself through a couple of charge/discharge cycles.
[Galaxy S II General] dan13l:
Pretty sure you can add the Netgear dgn3300 to the list of iffy routers, if that's the cause.

Android OS use is now at 1 1/2 hours having turned wifi on at 7pm. So in 11 1/2 hours it used 26 minutes of CPU, having turned wifi on for less than two hours its churned up another hour's worth of CPU time. Battery is now at 48% (dropped from 62% in less than two hours).

Minimal screen use.

So basically, we have a phone that cannot be used on wifi without epic battery drain.
[Galaxy S II General] troed:
Really heavy use throughout the day since 5.30 am GMT +1.

Do not wonder OS drains batt, this what makes this jewel work :-))
[Galaxy S II General] DocRambone:
Tried the sgs 2 on D-Link DAP-1160 and Netgear n300 without any problems
[Galaxy S II General] RogerPodacter:
which is rather ironic because most common experience is that using wifi all day rather than 3G actually is better for battery life, by far. its usually like double battery life using wifi over just using 3g on my nexus one, and most people in other forums report the same experience.

oh samsung what have yee done.
[Galaxy S II General] SBS_:
I was actually on wifi in a house that I'm pretty sure has a netgear router and suddenly android OS had used over an hour of CPU-time heh. Never had this issues at home with my Linksys e3000.
[Galaxy S II General] DocRambone:
Look at the iphone and pre forums, lots of similiar stories, some router has problems : Dir 655 seems the worst

Edit: Netgear WPN824 seems to have same drain
[Galaxy S II General] DarthOps:
Just thought I'd post my battery info for comparison.

I did a full reset after upgrading to the latest firmware and then earlier today I decided to freeze the wifi sharing apps. Pretty happy with my battery life! Even played some games and listened to music at the gym.
[Galaxy S II General] =RBL=:
Well, no problems here with Wifi. My phone's connected to my home network 100% of time when I'm at home, 1%-2%/h battery drain ?

It looks like people are jumping on the 'disable wifi, man!' bandwagon. Next thing you'll see is Engadget reporting on massive Wifi SGS2 issues :rolleyes:
[Galaxy S II General] rwc3b:
did you restore all your settings that you backed up or just start anew?
[Galaxy S II General] DarthOps:
I used titanium to restore some of my market apps but apart from that, I just set up everything fresh
[Galaxy S II General] msundman:
beacon + dtim

Have you people tried adjusting the beacon period and/or DTIM interval in your access point's advanced wireless settings?

E.g. with a 50 ms beacon interval and a DTIM of 1 it'll produce 20 wake-ups per second (1000/(50*1)), but with a 200 ms beacon interval and a DTIM of 10 it'll produce wake-ups only once every 2 seconds (1000/(200*10)).

(The performance might suffer a bit, though.)
[Galaxy S II General] sunilkaura:
Hi All,

My sincere apologies for long post.

I have been reading all the battery related threads with great interest but there is one thing that is driving me a little crazy.

I have what I guess would be considered medium Android OS usage, usually of around 1 min 30s per hour, but my battery is actually pretty good.

What's driving me crazy is the way in which we are all quoting our battery figures. Times of 'display on' and android OS CPU usage are one thing, but total time between charges is pretty useless, and here's why:

Picture this scenario: 2 phones, same apps/Widgets/firmware.

Phone 1: charged full until midnight, then unplugged and left to idle overnight. Unplugged at 7am.

Phone 2: charged overnight, then unplugged at 7am.

Both phones are used identically from 7am to, say, 7pm.

The issue is thus: if neither phone is experiencing excessive idle drain (~1% / hr), then Phone 1 would show 7 extra standby hours for the sake of only a 7% battery difference, which would make the Phone 1 owner v happy, and Phone 2 owner v sad.

From my (admittedly inexperienced) background, the only info relevant is idle drain, (which is fairly easy to establish) and display on time.

If the idle drain is high, then a background process, either within android/firmware or a running program in the background, is killing your battery.

If your idle drain is low, but the display on time is less than, say, around 3-4 hours, then a program or service running during phone awake time is what is killing your battery.

I only bring this up because if we are to figure out what is causing these unfortunate users such issues, we need perhaps to standardize some of the figures we quote to establish any kind of correlation.

I do not have the issue, but I factory reset my phone to test the times above, both with and without wifi, to see what they should perhaps be like.

I have an idle drain, both on and off wifi (set to never sleep) of 1% per hour.

My average screen usage time is 3.5 to 4 hours.

Android OS as mentioned above is around 1m per hour.

Hope we can crack this, cos I love my SGS II and I hope we all can enjoy its full potential.

Sun
[Galaxy S II General] lgkahn:
everyone quit looking at your router.. my sgs on same router overnight looses about 4-5 percent.. sgs ii overnight same settings. tried both wifi on all time and off when sleeping and 3g turned off looses about 35 percent.
[Galaxy S II General] DocRambone:
No, some routers gives heavy drain, if yours do not, fine. What brand and model?
[Galaxy S II General] NIK516:
ive got a dir 655 and on my iphone it was fine had the wifi on all day all night long its just with galaxy s 2 that i have problems.

But that may not be due to router. still waiting for a new update.
[Galaxy S II General] ignign0kt:
I'm on the newest firmware and flashed the Villain Rom

after 2h 21m my battery is at 82%

My Display (24%) has 30m of use and Android OS (61%) has 40m of CPU time

This does not seem right...
[Galaxy S II General] Furbious:
Now, this is why I'm loathe to think it's 100% router related - I flashed the villain ROM early yesterday too to see if it made any difference to battery drain.

Android OS is top usage with 1h 9m CPU, and 33%. Wifi has been off and on periodically, and I have frozen the wifi sharing stuff.

It's been on battery 17 hours and still has 58% - light use, just to check idle issue drain....

As soon as I flashed KE2 I had the battery drain (didn't have it with stock).

God knows what is causing this, the android OS is as high as ever but is no longer draining the battery, nor keeping the device awake.....
[Galaxy S II General] RogerPodacter:
This is not correct because the second phone that you unplug in the morning doesn't start its battery tracking till the charger is removed. So at 7am one phone would have 7 hours standby and the other would show 0 hours as it only just started tracking. At least that's how it works on all other android phones.
[Galaxy S II General] BoneMo:
How to freeze WiFi sharing apps ?
[Galaxy S II General] dan13l:
Generally speaking, yes. But in my case the simple act of switching on wifi causes the disproportionate additional drain.

Wonder if enabling wifi but not connecting to a router would have the same effect...

@BoneMo that's something you could find relatively easily with a search, or by reading a bit more of the thread. Root your phone, and use Titanium Backup, Easy Freezy, or some other tool to freeze undesirable apps.
[Galaxy S II General] CandyAndy:
So I have been also trying to get better battery life. Yesterday I updated to xwke2 and also reset factory settings. Batterylife is much better now. I have been using the phone noticable more today and also pretty heavy duty. I also just a moment ago rooted and froze wifi sharing, social hub and some strange in russia written mobilemail app. Lets see if it yet improves!
[Galaxy S II General] easycure1974:
I can say the same, my iPhone 4 works just fine with my DIR-655. But my SGS II is a disaster
[Galaxy S II General] :
disabled background data sync over night and the processing time and battery drain related to android os goes down and has a normal level.

the only 2 things i sync is email (exchange active sync on push level from itsolutionsnow.com) and the accuweather widget on 3 hour base.

could a bad exchange configuration slow down the battery? i had issues in the past with froyo 2.2 on htc desire with the exchange push. they were gone on galaxy s 2.2.1 and also not related on android 2.1
[Galaxy S II General] sunilkaura:
I believe that was my point:

Phone 1 would show from Midnight to 7pm, i.e 19 hours, with an extra ~7% battery loss, but Phone 2 would show only 12 hours usage, with a relative 7% less remaining battery.

So comparing the two, one would fee Phone 1 was getting better battery, even if thats not really the case.

Perhaps my post wasn't very clearly written - apologies if it confused ppl.

I guess what I'm getting at is its very difficult to compare these times/usages if the parameters are so different, and thus it makes it confusing to ascertain if we relly do suffer the drain (anecdotally).

What I propose is that in order to get to the bottom of this problem we ought to standardise (as much as we can) how we all measure these figures, so we can see what's really what.

Just my personal opinion, feel free to add to it.

dan13l, thats exactly what we need to hear. Yesterday I left wifi off after my reset to see what the effect on the battery was, and with almost no use over 12 hours I lost only 30%, screen time of around 1hr 30m, AOS CPU time around 10m.

Today I have connected my wifi, and over the last 5 hours, my AOS CPU time is already 14m. It was unplugged at night so this is all mostly idle too, 9% battery loss.

So although the battery is clearly holding strong, my AOS CPU time has gone up.

I am rooted, but haven't frozen any apps after my reset - I am going to do one at a time over the next week to see what might be causing this increase.

With reagrds to the D Link router, seems a clear case of incompatible drivers to me - could be on either end, as we all know not every router (or phone, for that matter) is built equal.

Sun
[Galaxy S II General] sohanlon07:
The battery thing is starting to annoy me. Though the battery life wasn't great on my iPhone 3GS and I would conisder myself a heavy user.
[Galaxy S II General] tameracingdriver:
I did the same and I have used wifi (including kies air), and although the android os process is a bit on the high side, I get reasonable battery life; I can certainly live with it until a fix is found (which at the minute seems to be android 2.3.4).
[Galaxy S II General] mi3x:
I was one with big baterry issues. I uninstalled WhatsApp (no longer syncs) and I got some pretty impressive graphic during the "night".

8h30 idle (with FB, Twit and 6 email accounts checked every hour via wifi with juicedefender via WIFI) with a 2% drain. I dont know what happened, last night I had 20% battery drain.
[Galaxy S II General] dan13l:
@mi3x - looking at that graph, it appears that, give or take, wifi has been going off with the display. It's not a solid bar the whole time. If you compare that with the one you posted on page 69, you'll see that before there was a solid blue bar of wifi. The phone was also "awake" at lot more according to that graph.

Conclusion: "something" was stopping your phone going into sleep properly, wifi was remaining active, and that's why your battery is better now than before.

What's you wifi sleep policy set to? I can't get that to work on anything other than "never" on mine, so I've resorted to using Tasker to toggle wifi with the screen.

Is it possible that you changed the sleep policy, and rebooted or something? To get it to take properly. I've not tried that yet.
[Galaxy S II General] El Salvador:
My experiences with the battery are roughly

1% drain per 4 hrs when idle without 3G/Wifi sync

1% drain per 1 h when idle with 3G sync

As for idle with Wifi sync I don't know but I think it's higher than 1% per hour.
[Galaxy S II General] ignign0kt:
I got a 7% drain aftet 5.5 hours of not being touched. With sync on.

while this may be considered ok by some people here, I still think this is unacceptable. My iphone barely would go down a couple % over night

I also underclocked to 200mhz
[Galaxy S II General] moxdown:
deleted all samsung hubs, switched off wifi, charged for two mintes with phone on, switched off while charging , charged while switched off until charging complete, removed charger, switched back on after about a minute and saw a significant battery improvement. Dunno if it was one thing i did or a combination of what i did. But battery now lasts about 2 and a half hours to 3 hours longer.
[Galaxy S II General] robstunner:
Get used to it. your iPhone doesnt to jack when its been idle for a while.
[Galaxy S II General] dan13l:
Well, I'm not sure what I did, but in the last two hours Android OS has only used 5 minutes of CPU. This morning it consumed 28 minutes of CPU in 35 minutes.

Wifi turned on all the time, because I wanted to test the numbers in comparison to the Tasker toggling I'd been doing earlier on.

My broadband internet connection went crazy at one point though, and I was losing the connection almost constantly, so I was rebooting the router and things to try to make it behave. I'm wondering if it's that that's somehow fixed the problem.

Maddening really, because now I have no idea what's causing it! It certainly looks like my device has stopped doing it for the time being.

Another potential candidate: I froze the Samsung Una app (the one that wakes up with a wifi toggle). That had no immediate affect on things, but it's possible subsequent reboots or disconnects have made it kick in.
[Galaxy S II General] vro25:
I find this a silly argument. If you guys want to turn off all your syncing or not run background apps why did you get an Android? There are better solutions out there for that limited functionality.

The iPhone does not run any background apps like Android does. If you can turn off all the background apps on your Android you will get the equivalent battery drain as your iPhone.

Otherwise, 1.5% drain an Android is pretty good - this is a non-issue. This isn't the old days of Nokia candy bar phones, enjoy using your phone and remember to charge it overnight.

The real issue is people reporting SIGNIFICANT battery drain (>3%) while the screen is off and not running intensive background apps so the phone should be mostly "sleeping".
[Galaxy S II General] ahampstead:
Just to contribute to this.. I have wifi turned off and network mode set to WCDMA only.

Battery level 29%

12 hours on battery

Android OS 39%

Display 23%

Standby 13%

Android System 7%

Dialer 6%

etc

One thing I have noticed is that when I run task manager Gallery is running and always seems to flick between 0 and 6% CPU usage while im watching it. Could this be something? It's constantly changing CPU despite me not using the Gallery app for several hours.
[Galaxy S II General] volpe71:
Not talking specifically about samsung but my old "candy bar"'s battery lasted more or less the declared hours.

Do a factory reset, full charge you battery and turn on your htc or lg or samsung or ... and leave it alone.

If the battery lasts less than (i'd say) 50% from what claimed by the manufacter then it is a scam.

For instance: Samsung claims SGS1 for "750 hours on standby" ONE FULL MONTH 24/24... its disappointing!

obviously imho

L.
[Galaxy S II General] sohanlon07:
I'm at 13 hours now, 34%, wifi on all day, some browsing, some words with friends, twitter, background syncing as normal. Seems to be improving a bit more for me.
[Galaxy S II General] :
found the top app on my phone which is draining the battery.

here it is: com.sec.android.app.encrypt
[Galaxy S II General] airwater9:
Report this bug to Samsung...get it logged...get a fix.
[Galaxy S II General] kreoXDA:
They actually measure stand by in a locattion with great coverage, with only the lowest draining VOICE band switched on, and with everything else switched off, including the screen. You can last one month in that mode. But no real phone ever stays in that mode for more than a second.
[Galaxy S II General] armanisafarai:
can anyone confirm doing a factory reset WILL fix battery life on XWKE2?
[Galaxy S II General] simonk83:
Nope. Tried it last night. No change in battery longevity.
[Galaxy S II General] ignign0kt:
Don't see this but I see EncryptApp 2.3.3
[Galaxy S II General] send2toonie:
I've got crappy battery life since I had this phone, today I used Odin and flash ke2. Left everything stock, flashed overclocked kernel, got root, left all Samsung apps nothing frozen or uninstalled.

Battery is now awesome. Not sure what happened or how long it will last. It's been 8 hours and drain is minimal.
[Galaxy S II General] dryspuri:
Just a curious question, are you using same sim that came with iphone in this phone?
[Galaxy S II General] cmd512:
Just noticed something interesting... my "screen off" and "awake" do not line up. For instance, if you go to the battery drain graph, most of you show awake and screen off to go on and off at the same time for the most part. My screen off is off and on, but my awake is constantly on/solid bar!

What could causing my phone from going to idle/standby?
[Galaxy S II General] paranoid2007:
For Android this is perfect battery life. If this is unacceptable for you: welcome back to the Iphone.
[Galaxy S II General] tonynz:
Let's not forget that if you see 20% left on your iphone, you are f*cked. If you see 20% on this phone, you setill have a good 6 hours.
[Galaxy S II General] CandyAndy:
I lolled. My battery doesnt last 6 hours even when there is 100% left..
[Galaxy S II General] silenceksk:
To contribute with the facts of SGS2 I have received 2 days ago. Last night I charged it and unplugged before going to sleep. Wifi and GPS off; gmail sync and some background data sync on. I haven't upgraded firmware yet (still on KE1), I haven't rooted and not freezed any applications. %2 battery drop for approximately 8 hours. However, dramatical increase in the percentage of Android OS in terms of battery drain was observed yesterday in the office when the Wifi is on.
[Galaxy S II General] jjs87:
hmmz i have something new happening since yesterday. The phone process even though i didnt called yet today is using 10%....
[Galaxy S II General] skibadee:
I did factory reset yesterday for other reasons and now my android os is very high. Weird thing Is my battery was fine before (android was around 10-15%). Now 34%

All I've done is restore apps with TB.I have however been leaving GPS enabled, but not used. The graph shows no activity for GPS.
[Galaxy S II General] DocRambone:
Looking at the % of android os in battery status do not give any info on the battery drain.

"android os" will take appox. 2 min cpu /h and if you have the phone in idle, this will be the major part.
[Galaxy S II General] skibadee:
I see thanks. That makes sense, my phone was doing nothing in my pocket for 3 hours, For once :-)
[Galaxy S II General] dan13l:
It appears I'm back where I started again today, 4 hours off charge, virtually no use (screen on time is 20 minutes) and Android OS has eaten 45 minutes of CPU time.

That said, battery is at 85%. So not horrific, but ideally I wouldn't shed 15% by not doing anything!