yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] ignign0kt:
I thought AMOLED displays were supposed to be more efficient than lcd..

Even on the lowest brightness the	Displays sucks the battery up like nothing haha
[Galaxy S II General] mi3x:
Ok, I did a hard reset, froze LOTS of garbage, removed autobrightness and it seems my baterry life has hugely improved.

The only thing I noticed after hard reset is that my RAM memory is "smaller". I only have 833mb, and got 471 mb occupied. That's weird. I got 3 different reports:

TitaniumBackup reports:

System ROM: 528 mb (51 mb free) and the green line is almost full.

Could that be an error in reading?

The app System reports - 58% used (365 mb available)

And the preinstalled TaskManager - 474 MB/833MB

Care to share what is your memory report/s?
[Galaxy S II General] Arthur Hucksake:
You have a really REALLY good point there.

Think alot of it is a placebo effect.
[Galaxy S II General] sblock:
Same here. Is it normal?
[Galaxy S II General] send2toonie:
This is not normal. Should be similar banding.
[Galaxy S II General] dan13l:
There are definitely occasions on my device where awake and screen off don't line up. It's not like it's never going to sleep though.

Remember Android is perfectly capable of deciding to do things while your device is asleep. Checking through your logcat will give you an indication of what's going on while it's asleep. I've found the record function on LogViewer quite handy. Start recording, turn off device, leave it for a bit, check recording.

There's a LOT in the log files, but you may be able to see if some app is chewing through your battery while the screen's off.
[Galaxy S II General] kreoXDA:
"Awake" and "Screen On" does not have to be 100% similar.

Screen off means just that, the screen is off.

[if you have NoLed I think screen will never show up as off, correctly]

Awake means phone is not asleep, and some app or service is actively doing something. This happens if you for example listen to music. Or if you have a bad Exchange mail set up. Or some weird widget. Or some "battery defender" that actually stays up at all times to "defend" your batt ;)

Finding these aggressive apps and services is a challenge.

For me - I noticed that if I disable Packet Data, the Exchange Mail client is unable to do its work and starts pinging the net continuously, painting the Awake line green. I think it is because of the way my company set up the security profile for Exchange clients.
[Galaxy S II General] vro25:
20mins of screen on in 4hrs is not virtually no use. 1 minute of screen on in 4hrs is virtually no use. If the screen is on for 20 minutes, then your CPU is actively working for 20 minutes.
[Galaxy S II General] MaBlo:
Mine battery life is pretty good so far. Only had the device a couple of days though. Completely stock, no resets or whatever.

Edit: battery at 68%
[Galaxy S II General] vro25:
I'm just using the above as an example... This info is not that helpful.

It would be more useful to include:

a) the usage time each process is taking up (just click on the process to see usage time).

b) screenshot of the battery usage graph - this lets us see how your "screen on" time relates to your "awake" time. If you have a lot more awake time vs. screen on time then there is likely a problem somewhere.

As an aside, the Super AMOLED screens on these phones don't use power to display a black pixel. Having a solid BLACK image as a background will actually conserve battery life.
[Galaxy S II General] Natascha303:
what is ur stock version ?

68% with almost 2 hours screen on is pretty good. 3G and WLAN using ?

i get 4 hours overall with one charge, bit small, what ?
[Galaxy S II General] cmd512:
Yeah, it shouldn't line up 100%, but awake on my device was showing a solid green bar for about 7 hours when screen off was clearly showing off and on.

Found the culprit though after going through and checking every app to see if "idle state was disabled"... and I found that when I clicked Google Voice, it was nonresponsive and system would freeze (even though it was installed and shown running under services). So, I uninstalled it, re-installed, and now it loads when launched. Afterwards, screen off lined up awake off. Rogue app indeed, haha.
[Galaxy S II General] MaBlo:
I'm on KE2. Been on wifi pretty much every time I used it, disconnected every time I stopped though. 3G maybe 10-15 mins.
[Galaxy S II General] send2toonie:
Maybe a long shot but I'm noticing great battery life after not using Samsung email app.

Granted I started fresh flash of ke2 left everything on but not used built in email to sign into my hotmail and other emails. Still using gmail.

Maybe worth a shot.
[Galaxy S II General] MaBlo:
Doubt it, I've been using the Samsung email app all day:(
[Galaxy S II General] send2toonie:
Well not sure what happened to my phone but in total I've flashed ke2 4 times. This time its perfect. Wifi on or off 3g/2g on or off its very good with battery. Nothing frozen or uninstalled.
[Galaxy S II General] yhrn:
I posted a query on Samsung Sweden's Facebook-page to see if they are aware of the battery drain issue and are working on a fix. Today I actually got an answer that roughly translates to:

Since it's on their public Facebook page I guess it can be seen as some sort of semi-official acknowledgement of this problem by Samsung. Maybe not enough to start celebrating just yet but at least a step in the right direction.
[Galaxy S II General] villanbob:
If this helps at all, I was having the Android OS usage problem. Lost 35% overnight while just sitting with no screen on.

I installed Juice Defender and disabled Game/Music/Readers/Social Hubs as well as IM and Samsung Apps.

Currently on 9h 29 m with 87% battery remaining!! I sync an Exchange account and GMail, both set to push immediately. Light usage, but compared to the drain when doing nothing before, it's made a huge difference.
[Galaxy S II General] NIK516:
Scratch that, jumped back up to 34% hope they fix this soon i love taking full hd videos and pictures.
[Galaxy S II General] BoostedSR20:
Lol yeah mine is sitting at 72% right now. Havent turned the screen on for awhile.
[Galaxy S II General] NIK516:
yeh mine back up to 72% again, just wondering if this could damage the processor ? and if it does will Google be liable?

Actualy can we get a poll made for this thread?

Asking how many people are having high os readings?

under 20% on average

over 20% on average

0ver 40% on average

over 60% on average

And with a reply a screen shot of your base band , kernal version and build number?

also if you have any launcher apps or if running a stock system with touch wiz?

this info might help us.
[Galaxy S II General] cavinsoo:
I love my SGS2 but after 2 or 3 days, I started to have problems with the battery. On the first couple of days, I had amazing battery life. On the first day, the graph was going horizontal.

Attached are some screenshots.

Not rooted. Stock ROM. Launcherpro Plus. No live wallpaper. Latitude on.
[Galaxy S II General] rdy2go:
Exactly the same experience as yours. 2 first days were perfect...
[Galaxy S II General] beppez82:
From a full charge... with watchdog i see that suspend service is using lot of cpu we will see at the end of the day of course btw for now the android os after 1h was active only 6m so seems better 15min display
[Galaxy S II General] airwater9:
Guys all this anecdotal stuff that people are sharing about what % it is now and what % it was yesterday is just making this thread longer and more useless.

We've established that something within the general term of the 'Android OS' which is using excessive processor cycles and preventing the device from going to sleep. The next thing someone needs to do is to go down to the process level and isolate which process it is that is using so many processor cycles and preventing the device going to sleep.

Can anyone look at this? I'm going to work today so I won't get the chance for a couple of days but this phone is suffering with battery life.
[Galaxy S II General] DocRambone:
It already stated that the "suspend" process that is to blame for this bug
[Galaxy S II General] nechmadi:
i don't get this bug .. using go launcher, rooted with chainfire KDD firmware, 48% left battery.
[Galaxy S II General] Guitarfreak26:
I don't get why display is using so much battery because I have the brightness off! I'm getting about 8 hours max
[Galaxy S II General] walda:
its "suspend" and "events/0".
[Galaxy S II General] chisnz:
Wifi sharing was my hog. Now frozen and there's little else going on. Fingers crossed.
[Galaxy S II General] subvertbeats:
As far as I know the suspend process is the event handler that interacts with apps and allows them to keep the device awake etc.

It's normal that it's running continuously (apart from when charging - it should consume 0% then) and normal drain is upto 10%.

If it's more than this then it's likely that suspend is interacting with a misbehaving process. Could be an app, a widget, some sync process etc.

I'm now getting 2% per hour drain on average at idle. I'm rooted but haven't frozen anything.

I did make sure I removed all the '... for social hub' accounts so all i have left there is Gmail account, Google apps account, facebook account and samsung account.

Gmail account set to sync everything except picassa.

Google apps account is set to sync mail only.

Screen is typically set to 0% brightness unless I'm outdide, when i set it to automatic.

I did note that an app that id recommended for tracing drain (power tutor) was actually caning the battery so I removed.

System Panel app highlighted this fact, and allowed drill down into android os, to see which processes were causing drain.

Wifi is set to never sleep.
[Galaxy S II General] walda:
Dont you think 10% is too high for "suspend"?
[Galaxy S II General] Chief_Death:
the bug is said to disppear in SGS I when you remove samsung accounts and software update.

check this topic in SGS forums

http://xdaforums.com/showthread.php?t=1039696
[Galaxy S II General] beppez82:
If I go under account and sync i see that the agenda don't stop to sync anyone have noticed these?

I also got a message while inserting my first agenda event telling me that it cannot sync with kies etc, but it is synced on my gmail account so i didn't give much attention to it (was the same on sgs1 ginger)

On the phone it never stop also tryed with different accounts... same issue
[Galaxy S II General] DocRambone:
More tests done today:

30 min use, gps, music with background data on: "android os" at 40%

Total battery loss 22 %

30 min use with the background data of, "android os" at 5 %

Total battery loss 13 %

Both on a fresh XEKE unrooted phone...
[Galaxy S II General] RyanZA:
Sounds about right - other Android devices see similar differences between background data on and off. So I don't think it's really an issue/the issue.

EDIT: That is to say, both 13% and 22% are very bad for 30 mins? Although I guess it depends if the screen was switched on the whole time.
[Galaxy S II General] DocRambone:
With data on it takes 7 % battery / h in idle

With data off, 0,5-1 % /h....

Not normal.

Any good tool to see more on what process uses the data connection?
[Galaxy S II General] RyanZA:
7%/hour on idle is very much not normal, my phone is sitting on ~2%/hour idle with full background syncing of everything, as well as whatsapp running and a ton of widgets and things.
[Galaxy S II General] RogerPodacter:
the tests i've done with amoled, i am a strong STRONG proponent that amoled screens actually use far far more power than LCD screens. i've tested this so much and lcd comes out more efficient every time, so i think it was all marketing hype.

take some current readings of the htc inspire screen on and then the desire or nexus one screen on and the the lcd wins based on current draw.
[Galaxy S II General] kreoXDA:
Agree with you. But just as "standby time" it depends on how you measure it.

Display sparse grey text on white background in s reader - LCD easily wins.

Display sparse grey text on black background - OLED wins.
[Galaxy S II General] :
could it be possible that a old or defect sim card is responsable for the battery drain?
[Galaxy S II General] lgkahn:
no .. doesnt anyone read.. the same sim card in my sgs last 3 days. and also the same wifi routers at work and at home..

so stop blaming stuff it isnt.. it is pretty clear it is a bug in the os. since suspend should not take hours and hours of cpu when you are not using the

phone.. it is never getting to sleep.
[Galaxy S II General] Shocky2:
Bug is back for me, noticed it was a bit higher this morning but checked tonight and Android OS is upto 30% and CPU total of 1h 10m. :mad:
[Galaxy S II General] =RBL=:
I feel for you guys, I had the same problem with my old phone SE X10 and absolutely hated it because of the battery life... mainly.

Seems like I was lucky this time though, my SGS2 can easily last 2 days without rooting and/or disabling anything in the background
[Galaxy S II General] Arthur Hucksake:
Just checked mine. Running 1 day and 4 hrs. 36 mins Android OS time in total.
[Galaxy S II General] dan13l:
Today's stats:

14h 11m 21s on battery

Android OS 1h 17m 47s of CPU

Display 1h 32m

I've not really been fiddling very much today, but I've sent quite a lot of text messages, listened to two 45min podcasts with BeyondPod, had a play with SubSonic after setting a server up, and done some Tweetdecking.

Battery is at 50%. Which I think is quite impressive, to be honest.

So regardless of the fact that the Android OS figure is high, it doesn't appear to have been chewing through battery.
[Galaxy S II General] xxmwxx:
I get horrible battery with mine as well. Left it without charging at 30% when I went to sleep yesterday, after waking up I found the phone was already dead (had nothing running in the background - maybe just data and sync... still shouldn't take 30%)

First thing I noticed was the Wifi Sharing bug everyone knows about. I suspect it comes from Kies air or AllShare because once I opened those up, closed them and disabled wifi, wifi sharing started going crazy and ate away at my battery so I to kill it.

Today Android OS went crazy so I did some testing and I got some interesting results. I left the phone I idle for several periods of time and I just checked up on it every X minutes (randomly) to see what's the battery status and android OS status.

Here are my results (started the test after being on battery for about 3 hours - had 1+ hours of Android OS out of those):

Time of day (EST), Android OS CPU usage

--Wifi turned on (juice defender on)

14:55, 1:12:18

15:17, 1:26:31

15:50, 1:46:41

--Wifi turned off (juice defender on)

16:03, 1:47:35

16:32, 1:48:37

As you can see as soon as I turned off wifi the Android OS process started using less and less CPU for some weird reason, no idea why.
[Galaxy S II General] sohanlon07:
My battery seems to be improving. 15th hours pretty heavy usage and still 20% left. Not bad I suppose. Plus that's with wifi on all day too.
[Galaxy S II General] RogerPodacter:
well what i find is that the SLCD stays at a constant 300 mA no matter what the screen is displaying. but the super amoled pulls a crazy 650mA on white, and 180mA on black/dark. i would easily take the constant 300mA myself.

but that is with screen brightness maximum. the SLCD if the screen brightness is lowered to minimum, it pulls a constant 90mA no matter what, which i personally would rather have. cause at least that is predictable and a low power draw to boot. amoled is just too all over the place.
[Galaxy S II General] kreoXDA:
Very interesting, but you stopped before you were done sharing all the facts :)

What was the draw of OLED on minimum brightness?

And you mean micro amps, not mini amps, right?

Strange that OLED still draws 180 mA on plain pure black - it should be under 50 I hoped. Did you measure the original Super Amoled or SA Plus?
[Galaxy S II General] aussiebum:
Disable / Freeze the following installed software to massive improve STANDBY battery

Hi All, just sharing the results of some quick forum searching on ANdroid 2.3 / Samsung related battery drain fixes.

I applied the changes last night before going to bed and it seems to have worked quite well - with 3g and background data on (but auto sync off for everything), the battery only went down 3% (from 96->94) over 6hours and 20minutes.

Here's what I did:

Using Titanium Backup (requires ROOT), I FROZE the following apps (as opposed to deleting them just in case I want to use the functionality later):

1. Wifi Sharing

2. Wifi Sharing Manager

3. Software Update

1 and 2 AREN'T related to tethering - I think they're for Wifi Direct, which I'm not using atm. 3 is for OTA pushed updates I believe and not software updates via PC (ie. Kies/Odin/etc).

Finally I also read somewhere that the service SNS (used for Social Hub) is buggy and will chew battery life if there isn't an account setup for it, so I setup Social Hub with just my (unused) Twitter Account and then in Settings -> Accounts I set SNS Sync Interval to Manual.

Of course, if you don't use Social Hub you could just use Titanium Backup to FREEZE the following:

4. SNS 1.5 (and any other app that starts with "SNS")

5. Social Hub

With the above changes, the only major source of battery drain when the phone is idle other than Cell Standby is "Android OS" itself, and that's probably the "FastDormancy" bug being discussed in the Dev section of the forum atm.

Hope this helps someone!
[Galaxy S II General] RogerPodacter:
no i mean mA as in milli amps. all these readings are on regular amoled, so i guess another 30% efficiency can be added according to samsung's claims.

i'm kinda a battery guru, so i've been doing these insane tests for the last 6-8 months. i was able to hack the battery driver to take real time resistor readings over the battery terminals which is just a more fancy method that the current widget somewhat does.

the amoled on minimum brightness is at 90 mA as well showing black colors. i could only dream of it reaching 50 mA!!

here is a bit of the testing i did a few months ago, but its only some of the tests:

http://xdaforums.com/showthread.php?t=998544

the current readings cannot seperate out the components, so i cant isolate the display only. all we can do is take total readings which includes all running components, and then compare the ratio of total power of different scenarios.

what's interesting is that i get much different results than the app power tutor gives. the resistor readings are cold hard fact, but power tutor is a guestimation, so that makes sense i guess. but a lot of people quote power tutor numbers, if only they knew how inaccurate they might be.
[Galaxy S II General] leedavis:
I had really bad battery. Reset back to factory settings and found the battery was amazing. I slowly added apps and eliminated those apps that sucked the battery. I'm pretty new to Android, but my first impression is great hardware and great OS, but many of the apps are poorly written. JuiceDefender is also now proving to be really useful.
[Galaxy S II General] CandyAndy:
I don't know what I did but today the battery has been outstanding.

Problem is that I have done a lot of things so I don't know which one fixed the problem or did it fix by itself.

ONE thing I noticed thou. Yesterday while I was playing with my phone the battery level suddenly dropped from 37% to 14%. Just in a second. I don't know if the battery just magically got calibrated or what but after that I have been happy with my battery.

No it has been unplugged for 2,5hours. With extremely heavy usage. Screen on time over 1 hour. I have been playing music from spotify thourgh bluetooth headset, surfing internet through 3g and wifi and also read news.

Screen has taken 50% and Android only 9%.

I still got 91% juice left.

I can manage with this!
[Galaxy S II General] DocRambone:
Something to consider: a dark background will take 3-4 time less power than a white one..

And the screen is the main power drainer for most users.
[Galaxy S II General] tamarian:
List all of them :)
[Galaxy S II General] CandyAndy:
I updated to KE2, factory reset, format sd-card, rooted, froze wifi sharing and social hubs, moved the one file to sd-card which was suggested in the other discussion, put a background which is mostly black/dark.

Well I just noticed that Android OS has rosen to 40% :p still the battery is lasting ok.
[Galaxy S II General] robbiekhan:
After deleting the .db file yesterday I charged to 100% and almost 18 hours later I'm at 39% battery:

I use Wi-Fi all the time, have twitter sync on, Friendcaster checking, Gmail sync and background data.

Notice the Android OS CPU time! Also Diaply on tiem is saying just over 2 hours which seems about right.
[Galaxy S II General] LBTaylor1984:
I dunno how you managed that. tbh my one wakes a hell of a lot more. like every few minutes. unfortunately i believe this is killing the phone. oddly enough yesterday i managed 22 hours on a single charge. With the battery dropping 1% every few hours. today I've dropped 20% in 3 hours... I've not changed anything since yesterday
[Galaxy S II General] robbiekhan:
31% now since my last post, I have used IM a bit as well as checked emails/Market.

Again, all services runnign normally and Wi-Fi on!
[Galaxy S II General] DarthOps:
Very happy with this!

It was with normal use for me:

sync enabled, a mix of wifi and 3g, little bit of music and lots of texts :)
[Galaxy S II General] janldl:
hi guys first post after much linking to try and find out what's been chewing up battery life.

firstly a huge thanks to everyone on this forum. think i would have returned my phone after the first week if it wasn't for xda.

started out with stock sgs2 and battery life was ok. buy after couple of days kept draining overnight from 60% to dead.

flashed to ke2 and rooted phone which seemed to make some difference including a small reduction in android os and screen drain, but still draining about 40-50% overnight.

bought titaniam pro and started freezing a bunch of apps most of which were mentioned in a list a few pages back. turned off auto sync and success! overnight dropped

but noticed wasn't getting gmail and fb updates. so turned it back on and phone dropped 50% again overnight.

plus according to android booster factory test and vpn service were draining battery so i froze those.

have now turned auto sync off but background data is on.

questions

1. has anyone experienced this with auto sync? also what's the distinction between background data and auto sync?

2. i run my hotmail on exchange on stock email app which works a treat as emails are pushed but have noticed it does drain battery alot. anyone have any recommendations on settings?

3. i installed juice defender but found it was using alot of cpu and battery so have uninstalled. anyone else experienced this?
[Galaxy S II General] kreoXDA:
1. Background Data "ON" means you allow the apps to connect to the Internet

Autosync "ON" means you let those said apps to connect whenever they want (on whatever schedule they have in their individual settings). You drop of 50% is probably coming not from GMAIL and FB only, you probably have something else that is autosyncing and is doing it too much and too often. Or you just get way too many FB updates, unfriend some of your friends ;)

2. I think the stock mail client with push for Exchange is MY biggest batt drainer too. Have not figured out what to do yet. It is company mail for me, and the company admin set up the security policy and everything in NotifyLink server software, I am suspecting he did something wrong, will be checking with him.

3. I have never used it, and I am not even using those various Batt widgets - I think their mere presence eats up extra juice. But I know people swear by JD.
[Galaxy S II General] vro25:
I think Stock Email client is the problem. Post a screenshot of your battery usage graph.
[Galaxy S II General] vimto25:
yes this does drain the phone tbh