yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] janldl:
thanks for the detailed answers kreoxda

will post my graph in the morning, it seems to have reset after a full charge.

I've set my exchange email to update every 4hrs off peak which seems to help a bit, butter during peak hours it still drains loads.

I've turned auto sync back on as without it, wasn't getting push gmail. kinda defeats the purpose of having a android if you can't get push email.

not really sure what else i can do to improve this.

interesting fact on watchdog lite kt shows my cpu has never gone to sleep or suspend.
[Galaxy S II General] RHGilroy:
FWIW, I don't believe that the Stock EMail client is the major cause behind the Battery Drain

I have an Exchange Email account using Push 24/7 and receiving about 120 Mails per day..........also Gmail account on Push and several other Email Accounts on 1-Hour Pick-Ups

Despite this, I average about 1.5% per Hour Battery Drain on Screen Off Idle.....Using Two SGS2's and both exhibit similar characteristics, so I doubt that it's "batch variability"

I do use "Running Services" from "Manage Applications" to FREQUENTLY (about once every 2 hours) to ensure that Software Update; Wifi Sharing and Manager and a few others are not running

I believe that Wifi Sharing and Manager (which come on every time Wifi or Hot Spot is turned on) is the major battery drain......and every time I stop using Wifi or Hot-Spot, I use Running Services to disable these........otherwise they STAY ON in the background, even when Wifi or Hot-Spot is turned off

Prior to Stopping these Services (started about 2 weeks ago) I was seeing 5-7% per Hour Battery Drain on Screen Off Idle

Give it a try
[Galaxy S II General] r_a_c:
I don't know how mine goes, good or bad?

I have now 1 day and 20 minutes since last charge. Screen time on is 4hours and 20 minutes.

With WIFI or 3G on all the time except for 3 hours were in airplainmode. If I don't touch it it doesn't drain. But if I just pick it up, play a game or browse the web I can just see the procentages fly by.

Like When I downloaded some games today, I had 52% left. I played some and played with the options for abouth 45 minutes I think---> 26 procent gone!!

Does everyone has this feeling?
[Galaxy S II General] yatbond:
Thanks for the info. Would you mind telling me what software update actually does? Is this the auto update from market? Or is it something else?

Thanks
[Galaxy S II General] kreoXDA:
I think it all depends what kind of security "administrator profile" the Exchange guy pushed on your phone to actually do the Exchange link.

What I am seeing on my phone is quite not optimal:

1) Switch off Active Sync - every PUSH client and other syncing client on the phone would stop syncing, but Samsung Mail will still be syncing and receiving push mails. The only way to stop it is to set its private Schedule to do "manual" sync. Why does not it listen to global Android settings?

2) The Samsung Exchange client behaves ok when there is a reliable internet connection. Once you are out of coverage, or your coverage is spotty, it starts eating CPU cycles trying to constantly reach out to something. Like it is suffocating without a reliable connection and is kicking and convulsing.

I do not know if this is related to how my Exchage is set up on the server side, to my profile, or to this new Samsung email client.

I had a different (lighter in terms of security) profile on my old SGS1 Captivate, and that phone did not seem to exhibit these issues. SO I am suspecting it is the profile.
[Galaxy S II General] RHGilroy:
Not sure what you mean by "Samsung EMail"....

If you mean the "Social Hub", which has been noted here as a Battery Hog, then Yes, this will drain your battery very quickly

If you mean the "normal" EMail App or Client within Applications, then that should minimize battery drain

This will also respond correctly to the "Auto Sync" option in settings........if Auto Sync is set to off, then none of your Exchange or other Accounts will Sync unless you activate it on screen

I assume you know that the "Social Hub" acts as an "Aggregator" and is akin to having a SEPARATE Exchange Account on your device

Personally, I turn Social Hub off after every re-boot and then use Running Services to make sure it stays off
[Galaxy S II General] BarryH_GEG:
I use push Exchange and sadly get even more e-mails than the OP. So far, I'm getting what I'd consider decent battery life pretty much comparable to my ex-G2X. So I don't think the mail client's the culprit.
[Galaxy S II General] BarryH_GEG:
I use the Social Hub with Facebook, Twitter, LinkedIn, and Exchange and am getting decent battery life. From using it, I'm pretty sure it's pulling Exchange data from the local e-mail data store. It fetches content for the others but I use it as my only client so there's no duplication.
[Galaxy S II General] DarkStone1337:
Hm, I'm not 100% sure if the Android OS process actually affects battery life...

So I used Juice Defender to disable data when the screen is off, the result is below:

What I also did do is underclock the CPU to 800mhz and set the governor to Conservative. I also used Advanced Task Killer to kill tasks when the screen is off. My battery life has improved significantly!

I could be wrong, but looking at my observations, there is no noticeable loss of performance (except in benchmarks) at 800mhz, and the phone does not get nearly as warm as before.
[Galaxy S II General] BarryH_GEG:
Your Android OS, System, standby and idle are all roughly double mine. And I'm not rooted and using most if not all the hubs and syncs. Odd.
[Galaxy S II General] :
Activating wifi on my device immediately cause massive battery drain and I can see an immediate increase in the android os cpu time. Only using the 3g network dramatically improves battery life. with my old htc desire wifi was always on with no real effect on the battery life. This is proving to be incredibly annoying, and I'm ready to lose it. For a smartphone it's not very smart... I miss my desire!
[Galaxy S II General] kreoXDA:
Samsung Email - I mean the plain email client on SGS2 - it is Samsung-customized Android email client. Not pure android.

I do get push emails in it with autosync off. I tripple checked it.

I have never used or configured Samsung Hub. But I did notice the email counter gets shows on that icon too.
[Galaxy S II General] vro25:
Click on the top graph and take a screenshot of that.
[Galaxy S II General] petercarm:
It is more than an "android mail client". It is a front end to probably a System 7 back end run by Samsung - a bit like Nokia's messaging service or Blackberry's service. As such it is a huge step up in capability from the standard Android Gmail client and is pretty efficient on battery too.

I'm running 3x email accounts, GPS on, lots of syncing widgets, NoLED and I don't let Juice Defender muck about with mobile data because I think it breaks push email. Total battery drain at idle is about 3-3.5% on a 3 UK branded XKE1 rom. With the screen on, the battery usage is notable. NoLED is at worst 1% battery life per hour. Haven't done much wifi on testing yet.

I can't post the screen shot of the battery usage until I've racked up my post count, but this is pretty much everything I expected for battery life. I just reckon the smartphone vendors have it all wrong about the appropriate battery capacity. I used to run a 2400mAh extended batteries in my Palm Treos and that made using them a delight. I want a 3000mAh in my SGS2 to make it perfect - stupid to have a 8.49mm thick phone that does everything except have enough juice to keep the lights on.
[Galaxy S II General] poluks:
Same problem here, wifi browsing is eating the battery like wow, must recharge the phone twice a day with wifi use and playing around with options. I'm considering leaving it for the Sensation, which probably has the same problem, dual core is a big mistake. Battery life is the nightmare of Android users since the beginning
[Galaxy S II General] troed:
1000% with You !

Would be VERY easy to realise taking HTC HD2 ext. bat into consideration.

They already started into the right direction with issuing a click on cover with additional 1300mAh ext. batt. but still not enough

Would be nice to have this cover with 2600mAH and SGSII would still be slimmer than my HD2 with ext. batt.........
[Galaxy S II General] judgepd:
Same here...it definitely seems to be wifi for me
[Galaxy S II General] janldl:
screenshot of my overnight android battery. seems something is causing it to wake up every few mins

this was with wifi omit overnight but have frozen wifi sharing etc

android booster says my top consuming app is error notified and i'm wondering if Its something I've frozen in titanium that the system is constantly trying to reopen

confused!
[Galaxy S II General] farhaan1:
Tell u what i did, disabled auto refresh for my weather and news widgets and my battery is no longer draining, its made a huge difference
[Galaxy S II General] leedavis:
Read every post in this thread in desperation for a fix. I've just bought an SGS2 as my first Android phone. Co-workers convinced me to leave my iPhone and get an Android phone. I love it, but it's practically useless as the battery won't last a day. Android OS consumes all the battery. It wasn't bad the first couple of days so I'm thinking this is caused by a rogue application(s). Is it worth factory reset? I can't see anyone has tried that in this thread. Samsung wouldn't have let this device to market if it was this bad out of the box. :confused:
[Galaxy S II General] :
same here. the email still gets push mails in even if auto sync is off.
[Galaxy S II General] EleCtrOx666:
Your screen was barely on. No wonder you had 1d, close to 2. But I agree, 800Mhz doesn't make much difference in performance.
[Galaxy S II General] mathieulh:
Since updating to KE7 Android OS has dropped from 18% to a steady 6%
[Galaxy S II General] :
you have to compare the runtime not the %
[Galaxy S II General] jonrwg:
Well, my Android OS been over 40% since upgrading KE7, before this on KE2 Android OS is always below 20%.

As for runtime, 34m 0s (11h 46m 31s on battery). Pretty good I guess. haha
[Galaxy S II General] darkalchemist:
Maybe this bug is a case of it's going to get worse before it gets better xD
[Galaxy S II General] ignign0kt:
Apparnetly suspend and events/0 take up most if my cpu usage

Is this the way it's supposed to be?
[Galaxy S II General] matanc1:
Just letting you guys know:

I've reformatted the device and I"m getting a 6% usage from the Android OS.
[Galaxy S II General] leedavis:
This is first Android phone. Is this problem common to all Android phones?
[Galaxy S II General] Raspster:
Guys, you do relize this is an android 2.3.3 issue right? It also depends what you have running in the background. I have barley used my device over the past 6 hours and my android OS is 60%. I have also hard reset the device and the problem seems to go away for a day or so then after a re-boot or 2, it's back to hogging the android OS.
[Galaxy S II General] sewe:
Can´t say that it is, my SGS on 2.3.3 isn´t having this Android OS problems
[Galaxy S II General] simonk83:
Plenty of others are though. Not everyone on the SGS2 have the problem either.
[Galaxy S II General] sewe:
Isn´t that weird, if it´s in android or samsungs software everybody should have it right?

Even if Android OS is using the processer 2min/h it doesnt really drain the battery, yesterday i have 54% left after 19h and android os was reporting about 40min.

Yes it was idling a lot but still
[Galaxy S II General] Raspster:
I'm at around 10 hours with 50 mins on the Android OS. I'm at 71% batt. Not much done today. Mostly on idle. I did flash to the new rom earlier and then switch to the un-secure kernal so I can re-root, then back to the NEW stock kernal. Also did the google video talk hack so that took some power as they are all data intense. I will be honest, I'm pretty happy with being @ 71% after 10 hours with that. As for other devices with the android OS issue. They are out there. Many Nexus S people have this, I know that for sure. I can sit here posting links all day but we all know how to use google.com.
[Galaxy S II General] kaotickelly:
Here's my experience on my Handtec SGS2 (unlocked and unbranded)

I have very small number of apps installed, and haven't setup social or use music hub

- 1 gmail account using default gmail app.

- google calendar

- 2 yahoo accounts using yahoo mail app

- no wifi/bt, only 3g

- background and sync on

- checked and removed wifi sharing and manager, social hub from "Running applications"

- unrooted, stock KDD

I went to sleep with 39% battery, 6 hours later it's on 29%, so about 1.66% per hour.

Then I turned on then off wifi, and checked that wifi sharing and manage now appears in the "Running Apps" page.

1 hour later, the battery is down to 16%. So 13% in one hour!

I think I know what to force close now :)

Also, my Display % (~4hr) has always been at least double of my Android OS/System (1hr/15min).

I've just installed new KE7, rooted, and froze (according to previous posts)

wifi sharing

wifi sharing manager

IM

social hub (and email)

software updates

suggests

Game hub

Music hub (can't use in Australia)

BBC Iplayer (can't use in Australia)

I don't expect any major changes to my battery life, 1.66%/h drain is pretty good to me, as I'm a light user.

I'll report back on the new firmware.

Big thanks to the following threads too:

Rooting - http://xdaforums.com/showthread.php?t=1056334

Rooting app SuperOneClick - http://xdaforums.com/showthread.php?t=803682

Rom flashing and rooting guide - http://xdaforums.com/showthread.php?t=1075278
[Galaxy S II General] mb:
On the new KE7 firmware, Android OS usage has gone from 40% to 60% and my battery is now draining faster.
[Galaxy S II General] Eidan78:
GS 2 with last update

This is my battery life and the phone is still on:
[Galaxy S II General] qazam111:
thanks for sharing
[Galaxy S II General] hermaniii:
I think you have wifi on idle bug.

These processes go berserk when i have it on idle, my solution to not thinking about closing wifi all the time is Juice Defender pro.

Going from 8h idle 100%->12% to 100%-> 97% with JD pro. This was on KE2.
[Galaxy S II General] Chivalryyyy:
Ok heres my battery stats for anyone to make use of... and hopefully tell me if its good or bad ;0) ive ony had it 2 days so the battery is only on its second charge..

So.... unplugged it around 7:30 am..... and have had hardly any use today... a bit of messing this morning but other than that its been sat with the screen off for most of the day except the odd few seconds here and there..

at 11:30 the bat was down to 71%

at 15:00 it was down to 61%

at 17:00 it was at 52%

19:00 was down to 44%

21:00 was down to 37%

Im not impressed so far as most all of that time it was sat on my desk with the screen off doing nothing :0(

heres 2 images of the graphs and processes,,

so whats the verdict? normal drain or sumthin not good?? :)

I left my wifi on all day on purpose as thats what i used to do with my desireHD and wanted to see how the sgs2 coped,,

Oh and sorry for the massive imgs... lol.. wasnt sure how to resize,,
[Galaxy S II General] RogerPodacter:
No this seems to be specific to the galaxy s2.
[Galaxy S II General] LPT:
I think the problem is wifi. When I turn my wifi on all the time, the bat drains about 5-6% per hour but if I turn it off and use 3G in idle, its just 1% per hour. This is so weird comparing with my Iphone 4, almost drop 0 when using wifi in idle...:(
[Galaxy S II General] janldl:
i'm also having the same problems with suspend and event/0 eating up battery and cpu with random spikes every few hours

any ideas what is causing this?

my wifi has been off. im on ke2
[Galaxy S II General] r_a_c:
Allright, so my battery did something strange today. have a few questions abouth it.

I lay it down at 28% and an hour later picked it up at 31%, not charging it offcourse.

1)

I checked the battery graph, and there is a yellow line going up? What does the yellow mean? Also you can see after that some green going up again?

2)

Also the signal color, green is the best i guess? and yellow average? But I am now at the same place where i get the yellow color and now it is this grey-like color(the right on the picture) what is this one?

3)

Also one more question: what is the difference between the time above the graph and under the graph. It seems to variate a lot. Sometimes it is equal, sometimes one runs ahead of the other and than again come back together.

Thanks for answering!!!

[/URL]
[Galaxy S II General] viva.fidel:
Also having this problem, o2 uk running ke2, I've noticed it isn't as drastic when wi-fi is on (sleep never)
[Galaxy S II General] chalid:
1) battery calibration might be off ...

2) green = 2G; yellow = 3G

3) the graph (and the bottom counter) is not updating all the time, but the counter on top is. and to answer the next question: the top counter shows only actual battery time, while the bottom counter shows the whole cycle on one battery load. ;)
[Galaxy S II General] simonk83:
One thing I'd like to get to the bottom of is why the phone becomes "Awake" during idle times (ie, overnight) when the screen is off etc.

I find little (and sometimes big) blocks of awake time occur when the phone has been idle. I wouldn't have thought it'd be syncs occuring, as that generally only takes a few seconds (and there's no huge data difference for it to have to sync).

Wouldn't have thought this is helping our battery life, whatever it is.

EG:
[Galaxy S II General] bendispo:
Extremely frustrated. Running latest firmware.

Very light usage today. At home, wifi on.

9h 17m on battery

Battery level 27%

Android OS 71% - CPU total 4h 53m

Display 16% - Time on 2h 19m

Everything else (Android System, Internet, Cell standby, Dialer) - 3% or less each.

What is going on?
[Galaxy S II General] Lordsauron:
I am having this exact problem, but also my maps application is using something like 20% on avg. Even when I havent used it at all. Any one else notise that?
[Galaxy S II General] kaotickelly:
After my update to KE7 on Sunday morning, from a full charge at 12:30 pm, it went down to 9% about 2pm today (Monday). When I slept, it drained about 15% over 7 hours. So that's worse than KDD's 1.66%.

So that's 26 hours with some light use and constant sync (set up as per my post: http://xdaforums.com/showpost.php?p=14024422&postcount=863)

What I noticed was at night when I was sleeping, there was a period where the phone was "Awake" for about 2 hours, and 1.5 hours. Now according to the graph there wasn't excessive drain during that time, just a constant smooth curve. So I don't know what's going on there.

I just fully charged and "calibrated" my battery using "Battery Calibration" from market, let's see if things are the same tonight. After a few days I might just go back to KDD and retest. And maybe, just maybe, I'll do a factory reset.
[Galaxy S II General] dryspuri:
I think there is problem in odin as we are selecting not to format some files are still there from earlier version, so wee need to find a way to flash with formatting
[Galaxy S II General] ke3pup:
I've noticed a dramatic change in Android OS battery usage since i flashed to KE7 and then rooted by Flashing unsecured kernel, root, and then flashed KE7 kernel and remained rooted . Could that be the problem?

Android OS used to be on %4 - %10 for me on KE2.
[Galaxy S II General] CandyAndy:
Good thing is that you can affect the battery drainage by yourself by rooting and freezing apps. I did those and with heavy usage I lost only about 7% in one hour.

Well now for some stupid reason I used factory reset and not rooted and also tried the social hub etc. In the same one hour heavy usage I now just lost about 25%. This is horrible. The battery life is now so bad.

So pissed I have to do all the rooting etc again..
[Galaxy S II General] crammy:
I know a lot of people are having problems and the diehard fans are saying just live with it. But how can you when a phone is flat within hours.

After a lot of reading/research I've found the answer to be the removal of the O2 branding and resetting to CSC to XEU. This allowed Kies to perform an update to KE7 and now I've a phone using about 20% battery after 7 hours. Before it would have been flat by now.

Does ask the question how O2 can let something off the shelve have so many problems??

Full instructions shown here:

http://xdaforums.com/showthread.php?t=1064894
[Galaxy S II General] robstunner:
I have an unbranded, unlocked i1900 with KE7 and I still have the battery drain issue. As its been said before, factory resets will temporary fix the issue, but its resurfaces soon enough.
[Galaxy S II General] crammy:
I did a factory wipe/reset before the KE7 update to find the battery issue to remain. There is something on the change to KE7 and with a factory wipe which clears the issue.

I take it its early to say for sure but hope this is a long term fix.
[Galaxy S II General] robstunner:
im tempted to reset mine, its just a pain to re-do everything and already be expecting for the same issue to arise.
[Galaxy S II General] crammy:
May be if you get chance you will be another person checking for a long term fix.

We both can then report on our findings. Anything to keep the faith in these phones.
[Galaxy S II General] otacon888:
My android OS usage was always between 60-70% since I got the phone.

After updating to KE1, then KE2 and then KE7 it still remained this high.

Today, for the first time I wiped everything on the phone and since the wipe my the highest my android OS has reached is 26%.

I think in my case it helped...for now...
[Galaxy S II General] LPT:
Guys, I can confirm that wifi is the main problem, but this can be solved by freezing the wifi sharing combined with using Juice defender and let the Juice defender control your wifi(wifi on when screen on and off otherwise). My phone's battery easily drained about 6-7% per hour and the Android OS was 60-70% in idle, but after using this kind of method, the battery almost loses nothing in idle and Android OS is just 10-20%.
[Galaxy S II General] nikzDHD:
Had a very strange experience today was in a meeting then I suddenly felt heat in my pants! Took my phone out and it was hot! It'd turned itself off. Not sure if it was my fault or something but see attached picture. Generally the previous firmware for me used less on the Android OS this new KE7 seems to use a tiny bit more!

Very strange day with the phone today even in the morning I realised my battery drained from 100% to 85% within an hour! I've restarted the phone a few times and seems normal now.
[Galaxy S II General] r_a_c:
So mobile network doesn't use more power than WIFI?, Or does it turn off all data when you turn the screen off?
[Galaxy S II General] LPT:
yep, it sounds strange but in this case, somehow wifi uses more power than 3G, kind of bug I think.
[Galaxy S II General] jonny_ftm:
I never had this Android OS bug till now:

KE1 base updated to KE2 via Kies
[Galaxy S II General] gvoima:
Just for fun, I've been testing this with the shipped KDD firmware (I'll update to KE7 when it's available here) and with USB debugging off and on (there was some init problems before, on another phone).

I left the phone untouched for 6h after a full charge over night and in the morning turned it on.

When debugging was OFF, the Android System took about 15-20% resources and Android OS about 20-30%

With debugging ON, the Android System took about 2-4% and Android OS jumped to nearly 60%.

But the battery life remained fairly constant either way. And by just idling it drained nearly half of the battery in 6h. I had google sync on and it was on 3G network (same place). But didn't get any mails or calls/sms during the tests.

Before this I did a factory reset and didn't install any other programs.

Perfect phone for me atm., but the battery drain just when idling is not funny for a 520€ phone :/