yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] troffers:
Hey,

I have been testing out a few ideas seeing how battery life can be improved as I was losing 3% (or so) per hour in idle. I tested turning off packet data to see how it affected battery life and it used 0% in idle over 3 hours! Obviously this isn't ideal but I had an idea to use Tasker, seeing if I can automate my data usage to check every hour (much like my old iPhone 4) and I have seen a huge increase in battery life.

I get it to turn on packet data & auto-sync every hour, wait 5 minutes, then turn off again. I also have it set to go to airplane mode between midnight and 7am. My stats are now as follows:

1d, 13hr & 40mins on battery

3hr 13m on screen (been on 10% brightness indoors, 50% outdoors)

30% battery left :D

(Pics attached)

I'm pretty impressed now as I was getting concerned by the amount of juice this awesome device was using up when I wasn't playing with it!

Oh, if anyone wants my Tasker profiles, PM me and I'll export them for you ;)
[Galaxy S II General] boer:
Check my post on page 96 didn't you made same thing? My battery is much better now finally day and something and still not on v7 fw. I think that will help as well. So far not that bad as before.
[Galaxy S II General] bakili:
Please help Android Os eats now 32% battery. It gone down from 49% to 32%, but after I turned nearly everything off. Only keep emails on > Auto Sync. Running only one screen. Its ridiculous, what is point to have phone if everything needs to be off. I believe its Samsung c**k up, i moved from HTC Desire HD to SGS2 and now i feel sorry doing this. My DHD was 2.3.3 and battery was lasting me good 17-18 hr with everything on. If I set same settings on my DHD as on SGS2, it would easily see me 2 days.

I noticed if phone in sleep Android OS using more battery, as soon i start playing with it, even having screen time out on 10 min, Android Os goes down.

Battery on my SGS2 last 9hr max.

My SGS2 was previously on 3G network, I did unlock it, flashed latest stock firmware KE7 using Odin. Kies sees my phone and tells me i am on latest firmware. Will I be able to update firmware in future using Kies, I am kinder hoping samsung will fix it soon.
[Galaxy S II General] L3st:
So whitch is the cause of the draining? any ideas?:confused::confused:
[Galaxy S II General] Danwms:
I am also having this issue, suppose I just have to wait for an update.

Anyone able say how to freeze or even remove the samgsung apps?
[Galaxy S II General] rantzzz:
Are all these problems related to this?

http://xdaforums.com/showthread.php?t=1039696&page=18&highlight=investigation

Seems like it's a Gingerbread issue, and strikes randomly

Gosh the only remedy is to reboot the phone if you notice drastic usage of battery by the OS, but who the hell is going to keep monitoring the phone?!?! :confused:
[Galaxy S II General] Bratag:
For me it seems definitely related to wifi being on. In 4.5 hours off battery - 3hr 25 mins OS time. I turn off the wifi and only get seconds more used in 45 minutes.

I do have a dlink 615 and have read that might be the issue which kind of sucks because I love that router.
[Galaxy S II General] rantzzz:
Erm why would you want to leave WiFi on?

Most of the time WiFi is off if I don't need it

The issue with the drainage seems to stem from a buggy algorithm in the Gingerbread OS which keeps the phone awake even when the screen is locked

Some WiFi function is also kept running in the background...

Sheesh :confused:
[Galaxy S II General] balenax:
well, you are confirming my story now.... i also have the problem on dir-615 and when tried with a different router (not d-link), battery life was great.

we have 2 options : keep using the router and pray for an update that solves our problem or get another router. i went for the second option and i am now waiting for a new linksys.
[Galaxy S II General] Bratag:
Let me know if that works out for you. I am not a huge fan of linksys but would lean towards them if the issue is not present.
[Galaxy S II General] balenax:
i already tried on 2 different routers, a cheapo tp-link and a linksys. it works, android os process went down from ~50 mins/hour usage to just ~2, and battery was really fine ( ~0.5% drain /1 hour with wifi on but not using the phone, down from ~5% ).
[Galaxy S II General] genotypic:
For me the culprit seems to be Microsoft Exchange email. I have 2 gmail accounts and an exchange account on push when I first set up the phone. Battery life was about a miserable 12 hours with light use. However it lasts about 7 hours on constant usage (surfing and 720p video watching) on auto brightness.

I removed the exchange account and that was all I did. and guess what, the battery drain issue was gone! It now lasts about 2 full days with moderate usage. Android OS still consumes 20% but overall I'm not bothered as it's so much better than before.

Battery monitor widget showed a constant current draw of 5ma when idling, 2ma in flight mode whereas it was showing anything between 30-70ma previously. The 2 gmail accounts are on push and the weather and news widget updates every 2 hours.
[Galaxy S II General] CandyAndy:
So let me get this straight:

First you guys buy the newest and greatest of multimedia phones which have a bright big screen and endless possibilities.

And then you turn the brightness to minimum and disable all the network activity to last for even a day with your phone?

I'd rather charge my phone more often than have this piece of hardware laying low doing nothing.

Also to disable to exchange account is not an option because I also use this as my work phone..what to do then..
[Galaxy S II General] Spybreak:
Why are we still discussing this? It has been confirmed that there is a bug in Android 2.3.3 that causes Android OS battery drain in Dual Core CPUs. It is fixed in 2.3.4.

We just have to wait until a 2.3.4 ROM appears.
[Galaxy S II General] Danwms:
Can you point to a press release or something relating to this please.
[Galaxy S II General] bakili:
Could someone tell me please.

I debranded my SGS2 with latest KE7 firmware using Odin. Kies sees firmware info, and tells me I am up to date. Question: Will I be able to see future updates trough Kies, or I have to use Odin again for manual updates?

Anyone have any idea, when 2.3.4 will be released for SGS2?
[Galaxy S II General] Spybreak:
Sorry, I should've posted a source before.

Eldar Murtazin posted about it on twitter. He usually is right about all this stuff:

http://twitter.com/#!/eldarmurtazin/status/72930533776175104

"Google have issue with Android 2.3.2 - battery consumption is high for dualcore CPU. Issue will be solved in 2.3.4. Affected all 2xcore"

It does make a lot of sense. I used to have high battery usage in my old Optimus 2x with 2.2 and when I updated to CM7, which is 2.3.4, the battery lasted waaaay longer.
[Galaxy S II General] Danwms:
Cheers.

Normally how often are new builds released (especially ones containing serious bug fixes)?
[Galaxy S II General] spookyx:
Then you got lucky.

I'm running on a Linksys... in my case I don't think WiFi is the culprit. I have WiFi on all the time... but from experience with other phones this helps rather than having WiFi on because 3G uses a hell more energy... and even in stand-by, there are processes in the phone that uses network to get updates and stuff...

Looking forward to a fix.
[Galaxy S II General] CandyAndy:
Sorry for being noob but is the 2.3.4 being released on Nexus devices already?

Samsung could maybe be releasing 2.3.4 for SGS2 already during summer.

Otherwise have to wait till christmas/next year.
[Galaxy S II General] spookyx:
They can at least port the bug fix from 2.3.4 into 2.3.3 and release a new rom.
[Galaxy S II General] spookyx:
Mine is terrible too.

In 1h and 40m, battery dropped from 100% to 87% and used as follow:

Android OS - 53%

Display - 12% (16m)

Calls - 12% (6m)

Maps - 8%

Android System - 7%

etc
[Galaxy S II General] spookyx:
Definately suspend in/out is the problem

After installing watchdog and let it run overnight, I can confirm that suspend and events/0 linux processes are the culprit for the Android OS battery drain in idle (stand-by) mode.

Watchdog caught them passing 20% of CPU in idle for more than 200 times over the night... sometimes I've seen values of up to 80% of CPU.
[Galaxy S II General] DoubleYou79:
I have made the same observations. It is about time that Google and Samsung do somthing about this.
[Galaxy S II General] sunseaker:
I'm a little confused with this problem. From what I've read, this is a problem with GB2.3.3 and exists with all dual core processors and should be fixed in 2.3.4. However, I haven't read of these problems in the HTC Sensation thread (or at least nobody has brought it up yet) so does this mean the problem is only specific to Samsung and their roms, or is it processor / hardware specific or what? Why does it seemingly exist with Samsung and not HTC?

I'm not trying to start a HTC vs Samsung war but just trying to understand the problem more and determine if the talked about upgrade to 2.3.4 will actually fix the problem. I'm not not that certain it will. Especially, when Google themselves say in the bug report that it's up to the hardware manufactures to sort out in their roms. All Google has done is fixed the code to be more tolerant.
[Galaxy S II General] darkalchemist:
hmm my phone seems to be sleeping properly somewhat however I've noticed that on my SGS and SGS2 while idling the phone seems to be waking up on the latest roms while the screen is off. It even sleeps properly when I am using poweramp so I am suspecting something rogue either by Samsung in the rom itself or an app is not playing so nicely any more.
[Galaxy S II General] chalid:
I don't think Android OS itself is the problem, just some setting or app which causes the spikes and/or not letting go the phone into suspend, interrupting the process.

I've got a pretty nice runtime:

Display: 1h 18m

Android OS: 59m 53s

Internet: 14m 52s / 32,48MB received

Phone calls: 17m 46s

27 mails recieved (some of them read) and 2 text messages sent.

Only 2-3% battery drain over night (~8 hours) without an active data connection, but on 3G. I don't think Android OS is draining much here, though it says so on the chart. Besides the cases with obvious battery drain some ppl have, I think its only a setting to show or not show the Android OS usage.

HTC Sensation doesn't show any Android OS usage, nor Android System, phone calls or internet ... but surely they drain the battery too there. HTC just doesn't show it. Samsung might just hide the Android OS process from the list ... and will properly do.
[Galaxy S II General] ventrilocks:
mine

display is much more in the percentage - 40%

Android OS - 17%

Etc - remaining..
[Galaxy S II General] nicpol7:
i thing the battery drain issue will be fixed with future updates...same happened with the first galaxy s..from the first 2.1 rom to the last 2.3 many problems were solved..

for me tha battery was ok..lasted 2 days almost with moderate use until i installed paradise island game..after that i dont know how but wifi sharing..social hub and dialer apps appeared on my battery history on a total persentage of more than 30% for all 3!!!!!!my battery was drained in 20 hours with the same use...

i removed the game..all back to normal...

i dont know if anyone had the same problem..
[Galaxy S II General] balenax:
replaced the router yesterday and now all works great. i got the cheapest one i could find, a tp-link. now android os is at 13% with 24 minutes of cpu time out of 9h:14 mins usage. still 65% battery atm, not quite a heavy usage but not light either. a great change though :)
[Galaxy S II General] LBTaylor1984:
I can confirm that i too believe this to be an app problem upposed to a android or samsung problem. i at first thought i had this problem and through uninstalling some software and running a low screen brightness i had conquered it. however yesterday i suffer serious battery drain issues via the OS. Im quite convinced that this is a application issue as prior to yesterday i had no issues. ill report back when i narrow down the aop.
[Galaxy S II General] CandyAndy:
One thing I immediately notice is that my device doesnt seem to go to sleep when the screen is off compared to yours.

Here is my stats

Why is that? I got email pushing to my phone but I dont think it could be because of that.

Rooted and quite many apps frozen here.
[Galaxy S II General] skycamefalling:
It's the same for me. I can leave my phone lying around for hours but in the graph it's awake each minute (or something like this) for a short time. It seems to be woken up again everytime it starts to sleep. What could this be? I do not use push Email and all the other apps are updating each 3hours only.

Maybe this is the contacts and calendar sync over Exchange...I cannot set an interval here.
[Galaxy S II General] DoubleYou79:
hmm.... I have paradise island installed as well. I will freeze it using titanium and see whether that help. I will report back.
[Galaxy S II General] chalid:
Might have something to do with the amount of emails you're getting? The device is awake when something is pushed or polling is done.

Another problem I've seen a few times now: Some apps won't let the phone go to sleep. When that happens, batterydrain is huge (4-5% every hour) without touching the phone. Don't know which apps are responsible, because I'm closing a bunch of apps when it happens.

Here's a list of running apps. Those are pretty much running all the time:

Settings
WidgetLocker
Pure Calendar Widget
Make Your Clock Widget
DRM
Task-Manager
SyncmIDS
Google Services
Maps
IMEITracker
E-Mail
Swype

and cached:

com.sec.android.providers.downloads
com.sec.android.app.screencapture
LauncherPro
Packageinstaller
Package Access HElper
BadgeProvider
Calendar Cache
Weather forecast Widget
Simi Folder
Maps
LogsProvider
Android Core Apps
Clock
Market
TTS Service
Superuser
Taskmanager
DroidWall
[Galaxy S II General] DoubleYou79:
Tried freezing the game on my phone, didn't help. Still waking up very regularly and battery draining.
[Galaxy S II General] cmd512:
I had the same issue, cached eBuddy was the app causing it on my device:

http://xdaforums.com/showthread.php?t=1094666
[Galaxy S II General] CandyAndy:
and now it stopped. Maybe around seven when my push email peak time ends. However the last long awake time with no screen time is disturbing ..
[Galaxy S II General] limoubai:
After lot of test, it was the calendar sync, when i enable it, I drain 5-7% per hours. Now, I have a good battery life. I also froze all unused app (samsung apps, wifi sharing, etc).
[Galaxy S II General] DoubleYou79:
you mean sync with google calendar? funny I have that enabled and no problems. Seems to be a different trigger for every one.
[Galaxy S II General] limoubai:
no, Exchange Calendar synch. And I notice that the refresh icon was allways active on calendar.
[Galaxy S II General] rdy2go:
Finally solved my battery drain problem, it was simpler than I expected.

Battery life at least doubled!!!

1	WiFi Sharing and WifiManager	-- Uninstalled using Titanium

2	Samsung Bloatware (Social Hub, Days, Memo, Mini Diary, Yahoo Finance, AP News, Games Hub, Readers Hub, Music Hub, Accuweather)	-- Uninstalled using Titanium

3	Voice Command	-- Uninstalled using Titanium

4	Exchange Sync 1/hour instead of PUSH	-- Changed

5	WiFi Sleep Policy = Never

6	Advanced Killer Pro [aggresive each 30 minutes	Configured

Exchange sync, gmail sync, lots of wifi/3g browsing,

GReader Pro syncing google feeds 1 / hour

IDLE battery usage dropped from 5% / hour to ~1%/hour,

10 hours from 100%, 2 hours with screen on ---> 60% battery left!!!
[Galaxy S II General] Jmarley:
Originally the phone was terrible on battery in idle/standby, if it had 35% it would have turned off overnight !

Now.....

Battery 84%

Uptime 32hrs

stats.

Android 27%

voice calls 22%

cell standby 19%

android os 14%

phone idle 13%

display 6%

I am happy now and finally have an android phone that will last a few days between charges..about 8 with light use !

I have not removed any original software and i'm on XWKE7 firmware and the phone has a 8GB sd card.
[Galaxy S II General] troed:
It is really strange: although I am on KE2 stock ROM GER, no root, nothing disabled now I left my SGS II not plugged to charger from 11 pm to 8 am, WiFi on and I have less than 1% batt drain per hour and in the batt graph it tells me that in this period only at 5.30 am (when according to settings mail/calendar starts to synchronize every 30 mins) there are no "wake ups".

How comes that the same device behaves so different ? ........................
[Galaxy S II General] svenk:
Hi!

Now what do I make of this screeshot? I had the phone on idle mode mainly for about eight hours after being fully charged, and as you can see battery drain was very low- remaining 92% after that time. I only checked battery usage a few times. But then suddenly the drain went up drastically without me doing anything special, as you can clearly see in the graph. How that? WLAN was on all the time, nothing else.

Then I installed a screenshot tool to make the shots (this is where the graph briefly went up two times instead down, apparently the battery was recovering). I have absolutely no explanation. Why low drainage, then high drainage and then lower again, even recovering? :confused:

Not that I never charged my phone during this time!
[Galaxy S II General] SBS_:
Could be that the battery driver didn't update properly until the phone went awake the next time or something like that. Other than that it's probably an app that woke up the phone and then after that continued to drain some more power.

There are so many factors involved when it comes to battery use that it's really hard to point out one culprit if you're having problems.

Oh and just a tip, you can take a screenshot by pressing the home and power-button at the same time.
[Galaxy S II General] jedster:
I Noticed that my Voice Command keeps turning itself on?

When I kill it through running services, I hear "Driving mode off", but at some point it seems to come back on, even though I've checked all my settings:confused:
[Galaxy S II General] NIK516:
Ahhh driving mode off lol so funny, that sounds scary
[Galaxy S II General] rdy2go:
You have to freeze or remove it. Killing won't help, it comes back over and over.

The same applies for wifi sharing and other crap that wakes up phone for no reason killing battery life.

Killing process or service doesn't help.
[Galaxy S II General] rdy2go:
I had the same behavior. Wifi sharing started unexpectedly. I killed the process, helped for 2 hours and it started again...

Root the phone, install titanium backup and get rid of it.
[Galaxy S II General] rjr162:
I think people forget the biggest battery killer is signal strength and not actually a setting or app on you phone. (Ok I shouldn't say biggest but one that can range from the biggest to the smallest).

For example, at my installation work I get 3 signals, immix (my carrier), art, and T-Mobile. For some reason were at just the right spot for the 3 to fade out and the phone switches around during the day (but typically with a decent signal). This still impacts my battery life pretty bad. I can have a fully charged battery when I punch in and have 30 to 10% charge by 6 pm depending on where I have my phone sitting.

Worse yet at my Penn state job, with the older brick buildings and all, I can't get signal in nearly all the 5 buildings I do IT in. When I'm outside going between buildings its fine, but most of the time I'm inside. When I'm there I can enter the building with a 99% charge, and it will be dead or damn close by 5pm.

Now when I'm in an area with a solid signal (say my house) I can unplug it in the morning (8am) and have it last into the next day.
[Galaxy S II General] svenk:
This might actually be my problem also. When then drainage went up I just placed the phone in the middle of my two wlan access points at home (our bedroom happens to be in the middle).
[Galaxy S II General] droidluck:
I have my phone now for a week and battery drain is killing me. I also have the Android OS WiFi Sharing eating my battery. I installed LiteNing ROM now and will look to it if this will change. I was running on a KE2 firmware before flashing
[Galaxy S II General] Jmarley:
Yup, spot on ;) that and maps and sync options, why have people not realised this :confused:, You don't need to sync all the time or have 3g especially if You have a weak signal.

I must say though gingerbread is 10 times better than earlier releases regarding power use.
[Galaxy S II General] bakili:
my battery life improved today, Andoroid OS at 29%, 10hr on battery and 64% left.

I think the reason is Exchange, my exchange account is set off peak weekends and syncs every 1hr. I can see on battery tab, awake and screen on are running same, when past few days phone was awake while screen off.
[Galaxy S II General] Chivalryyyy:
been 38 hours since i last unplugged....(yesterday morning about 6am) and my Android OS is showing top usage with 33% battery usage... the CPU total is 1h 21m... so commin it at just over 2% per hour on my device

Still got 12% battery left :)
[Galaxy S II General] rdy2go:
Signal strength would be the most important factor if we didn't have so many bugged apps waking up phone randomly.

Let Samsung fix those obvious bugs in their components and then we get back to signal strength.

I've got minimum wifi signal strength, yet my battery life doubled after I removed few battery killing apps.

It's obvious prove there's something seriously wrong with software in first place.
[Galaxy S II General] Nishiyama:
Brand new SGS2 with original rom and very few apps, had it for 3 days now and y-day battery went from full to flat in under 8 hrs. Was home all day with wifi running and i didn't use it much since i was learning that i was not alone in this issue so i thought id leave it be and see how fast it would drain. Today the battery has lasted for 16 hrs and the main difference has been the wifi usage, been away from home most of the day which means no wifi and the powerconsumption graph verifys it (will post it tomorrow)

My setup

(untouched SGS2 3 days old, with widgetlocker installed and 1 hotmail account + 1 exchange account)
[Galaxy S II General] CandyAndy:
I also suddenly got much better battery life. The only difference today is that it is saturday which is not set as a peak day for my exhange account. So no push mail.

Maybe the push setup does affect so heavily then. Too bad cause I need it.

Just ordered second battery.

e. rooted, samsung ware, wifi sharing and just voice command frozen.
[Galaxy S II General] bakili:
Edit: Phone gone crazy again evening time. Phone is awake when screen off. :(
[Galaxy S II General] RogerPodacter:
I think somehow this is the android OS bug kicking in right at that point.
[Galaxy S II General] bakewelluk:
Just to throw an extra user's experience into the pile, rooting and freezing/uninstalling seems to be the way forward to solve a lot of common battery drain issues. Obviously there's some inherent problems that need to be fixed with an update, but freezing is definitely a good shout for a lot of the issues.
[Galaxy S II General] ase3000:
Battery Improvement

Since I got my new GS2 couple of weeks I suffered with battery and had to plug it in everywhere I go (Work, Home and Car):(. I noticed that Android OS used to stay at %50-80 and the fully charged battery would be completely sucked in ~ 10 hrs.

Since I used to have Xperia X10 and used the new Arc launcher, I missed how beautifully designed it was with all the animations and transparent look. So I installed Arc launcher on my GS2 and made it my default. Also I uninstalled couple of Samsung apps (social and readers hub, KOBO, Zinio , AP news and yahoo widgets).

Now after full charge here is my battery usage:)
[Galaxy S II General] nicpol7:
display and android os must be top on the list..this is perfectly normal with moderate use of the phone..

but this dialer app and also wifi sharing are for sure software bugs that must be fixed...
[Galaxy S II General] rdy2go:
Remove wifi sharing too.

Wifi tethering won't be affected.