yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] gottagetalife:
It's all in the ROM

Flash your ROM.

On the original ROM my battery life was "iffy". Sometimes good, sometimes bad. One app in particular (Tektrak) seemed to kill the battery in no time at all- around 6 hours.

I got rid of the app and installed the KE1 update and life couldn't be sweeter! Yesterday I played several hours of games, browsed the web, checked and responded to emails, installed a couple of apps, rearranged my apps, used the camera a couple of times, shot a bit of video, watched some video and made calls. I still had over 35% battery by 2:00am when I finally got off to bed.

With less heavy use as is the case on a weekday I can have over 50% battery left after 24hrs!
[Galaxy S II General] Locster126:
So 2days, display on autbrightness with 3hours 34min on time. Was outside alot so display was on full brightness alot of times.

Must say I took about 220 pictures with flash and a few videos (wedding)

So im amazed to last 2days with heavy camera usage.

I still believe however that android os was using alot so once that's fixed I'm sure battery life will be superior to any other device.
[Galaxy S II General] dk206:
Me too can get around 15hours+~

With HEAVY USAGE. BEST SMARTPHONE EVER SO FAR
[Galaxy S II General] relikade:
As my other s2 is not being used at the moment i have left it in flight mode. So far 42 hours and battery at 80%

if only it lasted that long with signal
[Galaxy S II General] r_a_c:
How "heavy" do you mean with heavy?

My phone is now 10 hours from the power plug. Display was on for 1hour 34 minutes(auto-brightness).

Did some internet, some whatapp, and just some going true settings and stuff.

Wifi or 3g always on, not alot of syncing turned on.

Is this good?

Seems like alot of people have different battery lifes. I've read things like 24 hours of normal usage and still 60 %!!!

Battery % is now 60%
[Galaxy S II General] LondonGemini:
I have to say, the battery life on my

Sg2 is really poor. Today is the first day I have taken it out. I have less than 50% after 5 hours with wifi and GPS off, the screen at about 40% and light use. I froze the hubs using titanium.

As this is my first android phone, I am not sure what's drawing my battery. This phone is rooted and has the latest Fw. I dunk know if I should (or even how to!) Restore it back to new.

Can someone please advise.

Thanks
[Galaxy S II General] MakeYourOwnTacoNight:
There's definitely some serious issues with the battery life on this phone. It's apparent that not everybody is experiencing issues and people have different expectations, but a high percentage of users have a battery bug or drain issue.

I'd estimate my iPhone 4 battery lasts 3 to 4 times longer than the phone I have. This is with SGS2 having an abundance of apps/processes frozen and nothing syncing/pushing except gmail, contacts and an IM app.

I'm currently getting better battery life from my Galaxy Tab on a cellular network and running the same apps.
[Galaxy S II General] sharpey:
if your a heavy user just have something like this to hand - http://www.mobilefun.co.uk/kit-power-junkie-twin-usb-emergency-charger-p25849.htm
[Galaxy S II General] ph00ny:
My SGSII is completely stock, unrooted on the latest firmware

Any of you guys using the social hub? I'm not using it since bunch of folks have reported since day 1 that it's a battery hog
[Galaxy S II General] Arthur Hucksake:
Everything off, WIFI set to off when screen off, no notifications or sync.

Phone sat idle for 5 hrs 30 mins, lost 6% battery.

Display and Cell Standby both have higher percentages than Android OS.

Definite improvement.

Willing to give it the benefit of the doubt, can only get better with newer roms and updates.... right?

Just wish the idle battery loss was like the iPhone 4. That thing, lose 2% at most overnight.
[Galaxy S II General] Funkym0nkey:
Here is mine with days use for work.

Unplugged it at around 3am and now running 17+ hours with almost 2 hours of screen time.

Nothing is frozen, just plain stock rooted.

Never logged into social hub.

Those having problems, just do factory reset, dont freeze anything, dont have automated.task killer running and see what happens. Its interesting to see that people who have frozen apps or using scheduled task are having more issues.

Sent magically from Samsung Galaxy S 2.
[Galaxy S II General] RogerPodacter:
i have a hard time believing that. when i set the iphone 4 next to the HTC inspire, i browse the web for 30 minutes straight on each phone. the inspire loses about 15% battery in those 30 minutes. the iphone 4 loses 3% battery. its just not even close. and i hate apple!! i'm an android nerd, but the facts are pretty compelling.

then i do the same tests with my nexus one, and it loses 10% in those 30 minutes of browsing. iphone 4 again only loses 4% in the same period. its just insanity.
[Galaxy S II General] El Salvador:
After a full charge I lost 20% after 3h40m.

3G was turned on all the time, as well as background/auto sync and the screen has been on for about 27 min. I have the autobrightness feature turned on.

I didn't do any browsing, video, games or music stuff, only some IM and emails, so it's fairly light use, imo. Do you guys think a 20% drop under these circumstances is normal?

If have stock firmware (KE2), it's unrooted so no app freezing stuff. Social hub has been turned on and I've set up my Samsung account. Unfortunately I can't turn Social hub off anymore and I can't delete my Samsung account without doing a factory reset.

Thinking about doing a hard reset and not set up any social hub stuff or samsung account anymore. I hope that should improve the battery life.
[Galaxy S II General] jimbob_me:
You've got a dodgy handset, send it back. The majority of people are getting good battery life, im still left with 40% after a 14 hour day which is pretty damn good to me.

As is the case with anything. One person will tell 10 people how bad something is, but 1 person might only tell 5 people how good something was.

I wish people would stop complaining about thier duff devices. Its dragging the rest of us down.
[Galaxy S II General] Arthur Hucksake:
Alot of duff devices out there then judging by the threads on this forum. :confused:
[Galaxy S II General] jimbob_me:
Not really. 90% of sgs2 users arnt on xda developers forum, and even if they were, people getting a good battery wont make threads about it, because its to be expected.

People with bad experiences tell more people. Thats life.

The original SGS sold 10 million units in only a few months, if 20'000 people think the battery life is bad than its thier call, but overall it means nothing.
[Galaxy S II General] Arthur Hucksake:
I lost 2% battery life just flicking through the applications page and stopping a couple of things. Did nothing, basically.

If I just got a bad battery, I guess they aren't too expensive to replace. Reluctant to take the phone back as there isn't a viable alternative right now.
[Galaxy S II General] KingKuba13:
When you don't use the phone, obviously the battery life will be great. :rolleyes:

6% screen lol

Try 60% and get back to me on battery life.
[Galaxy S II General] Arthur Hucksake:
Hopefully it's just a case of people being use to a crap battery life having previously owned other Android devices.

Don't think it's asbad as the Desire I use to have though, out of the box I recall that being absolutely terrible.
[Galaxy S II General] ph00ny:
Did you fail to read my comments about how i didn't have it with me most of the day because i was carrying my blackberry?
[Galaxy S II General] LondonGemini:
So has anyone returned a phone and found that their battery life has improved with the replacement.

I am trying to figure out if its the way the phone has been set up, or the battery, or the actual phone itself.

With that in mind, does anyone know how to do a hard reset? Also, what about the apps that I have bought?

Thanks
[Galaxy S II General] Uvaavu:
I'm getting similar battery life now out of my SGS2 as I was getting from Android Sense Roms on my HD2. The highly optimised Hyperdroid Roms lasted longer, but they're very very recent roms after 12 months of development.

I'm confident that once we start getting CM7 / AOSP we'll start seeing some better life out of the thing, but its fine for me currently.

Measuring battery life in the first week or two is a bad idea anyway - you'll always use it more in the beginning anyway and its hard to be objective.
[Galaxy S II General] MakeYourOwnTacoNight:
This really makes little sense. People are resorting to freezing and task managers because they are having issues. Of course there is going to be a correlation between the two.
[Galaxy S II General] siksik6:
How on EARTH do you just get 6% for the screen? Is it on the lowest possible brightness? Mine's only on half and it uses up 45%, and I haven't been thrashing it.. :/
[Galaxy S II General] LondonGemini:
Right,

I have done a factory restore and only installed XDA and a couple of simple apps. Hopefully this will make a difference. TBH its such a pain as i had the phone set up just right.
[Galaxy S II General] RogerPodacter:
that means he didnt use the phone by not turning the screen on. his screen-on time was likely about 15 minutes or so, maybe 30 min. but he didnt disclose that value so we dont know.
[Galaxy S II General] tameracingdriver:
I know the SGS2 has a few issues... (as do all phones), but is anyone with any technical know how actually surprised that the iphone, which is ridiculously restrictive and with a tiny screen and underclocked processor and an OS that is written expressly for a particular set of specs and optimised for such, has better battery life than a huge screened, dual core, power house of a device with an OS that can update itself in the background with the latest news / emails etc?

For me, it can be improved (and will be I'm sure), but even now, it is pretty acceptable for a superphone. I'd swap a bit of battery life for that huge screen and blazing speed.
[Galaxy S II General] LondonGemini:
Ok, a quick update

Firmware wke2 downliaded from these forums

Factory reset

Screen at auto brightness

Wifi on

Auto syncing on

I used 20% while watching iplayer for an hour over wifi

Do you guys think that this is reasonable?
[Galaxy S II General] LondonGemini:
I think the issue is the difference in usage people are getting. If everyobe got about the same, then it wouldnt matter so much
[Galaxy S II General] NBB823151:
Actually have got an exchange and although only one day the omens do not look good.. the battery is draining badly.

To be fair i need to get into a routine and give it a few cycles will report back in a few days
[Galaxy S II General] Funkym0nkey:
Actually lot of people do it out of habit. I know few paranoid friends who keep unlocking the phone every now and then to hit the kill widget of ATK.

Ironically such habits drain battery.

Sent magically from Samsung Galaxy S 2.
[Galaxy S II General] LondonGemini:
Do you mind me asking which fw you have installed?
[Galaxy S II General] MakeYourOwnTacoNight:
I guess you're right, many people may have started doing these things before giving the phone a chance. Personally, I've seen mild improvements by freezing a lot of stuff. I'm going to try a reset and slowly install apps/change settings and see how I go.
[Galaxy S II General] JJEgan:
First overnight sleep test with WiFi Off GPS Off Mobile Data Off .

Battery drop 3% happy with that .

jje
[Galaxy S II General] shopcity:
Please fix this google!
[Galaxy S II General] darkalchemist:
With wifi, gps and data off, you should get 1% overnight at most (eg 1% over 8 hours). I have 2 push mail accounts (1 gmail and 1 exchange) and with wifi on usually get around 1% an hour depending on wifi signal (in my office it's not great). 3G 2-3% an hour drain. All of this while idling to note. I've frozen the wifi stuff and software update and that does the trick for now it seems. I still notice a lot of time without signal and abnormal high android os usage for idle. I'm hoping 2.3.4 will be around shortly to improve battery further. I am constantly impressed by the rate of improvement though.
[Galaxy S II General] jacobnorth:
Try JuiceDefender to lower power consumption: http://latedroid.com/juicedefender
[Galaxy S II General] LondonGemini:
Which fw did you use?
[Galaxy S II General] android53:
Battery life isn't always bad on android.

My sgs1 with the latest samsung rom (with a few tweaks) drains 1% overnight (on wifi, total 8-10 hours)

After working all day with moderate phone usage it still has 75% battery left.

just don't leave your phone autosyncing on hsdpa all day and it should last much longer.

Some of you have high android os usage though... That should be <5%
[Galaxy S II General] dk206:
Battery 50%

Why are there so many battery threads. Obviously noobs still can't find search button before making thread after thread.
[Galaxy S II General] LondonGemini:
Hopefully you may be right. I was planning on returning this phone so I reverted back to the original Fw and Unrooted it. I have just watched an hour of video with wifi on. The screen @ 50% and its only gone down 15%

That seems a lot better. What do you guys think?
[Galaxy S II General] delitero:
I own an galaxy s 2 for a couple of days and now after downgraded to ke1 i manage to get 12 hours of phone usage from 100% battery to 10%. My usage was moderate like a bit of browsing, a 2 min youtube movie, 5 pictures, 50 minutes of phone calls, yahoo messenger, facebook and whatsapp in background for the whole 12 hours, wirelss and gps off, network data on gsm only(edge). I hope an update will be coming soon because this really sucks.
[Galaxy S II General] mso .:
same as you , its stay up to 15 h (max) !
[Galaxy S II General] Arthur Hucksake:
I set my WIFI to sleep with screen off, disabled social hub junk and background syncing and it's a huge improvement.

Come to the conclusion, it's the very poor phone reception in my house the main culprit.
[Galaxy S II General] delitero:
The best i got from the phone until now is around 4 hours of display usage with facebook/ym and 2 emails on sync, data on edge only, 50 minutes of phone calls and wireless and gps off. I really hope that will be a fix because thats pretty low(i used to get around 7 hours of real usage on my iphone 4 with 3g, wireless, location and notification all on)
[Galaxy S II General] redcellx:
Hey Guys,

I sold my iphone 4 to buy the galaxy s2 which is currently en route to me via courier. I have heard the issues regarding the battery life. Some get 24 hours some get 4 hours. Can it be possibly the battery needs to be drained several times to fully re calibrate itself with the phone so battery readings can be read accurately ?

There are 3 possible options:

1.the phone

2.gingerbread

3.the battery

A bad or uncallibrated battery is the most logical reason why some SGS2 users are experiencing the poor battery life. A better question is how many cycles of total recharging was done, and was there any differences noticed after several recharged cycles? I just bought the phone, my first android phone and I am trying to be the voice of hope here. I want to believe selling my iphone 4 for the SGS2 was indeed an upgrade and a decision i wont regret.

Thanks

RedCell X

Thanks

RedCell X
[Galaxy S II General] delitero:
Im unable to get more the 4 hours of phone usage from my galaxy, today i started the battery calibration process so i will post if any improvment.
[Galaxy S II General] r_a_c:
I see some people have only wifi on when the screen is on, and it turns off when the screen if off. Is there an option to do this?

Or do you always have to do it by hand?

I cant find an option like this...
[Galaxy S II General] stoney73:
Settings/wifi settings/press menu/advanced settings/wifi sleep policy.
[Galaxy S II General] dfrear:
I have certainly noticed battery life increasing over time, at first (with moderate usage) I was getting 10 hours before a charge was needed. Now I'm at 6 hours today with a bit of playing angry birds rio, few texts etc and 92% battery left :)
[Galaxy S II General] abrelosojos:
I hate how people compare this to a iPhone 4. Iphone4 hardware is rubbish compared. Its like wondering why you need to upgrade your old power supply unit when you upgrade from a Pentium 4 to a core2duo... this has two cores! Epic.

If you need to conserve battery, then take an impact to the performance. Down clock it to 800 MHz....
[Galaxy S II General] kreoXDA:
I can confirm that. I have perfect reception at home and freakishly bad at work. Batt depletes much quicker at work, even though I always place the phone close to window and try not to move it at work.
[Galaxy S II General] beppez82:
Try without WI-FI on because there's an incompatibility on some routers...got same problem as you and your drain is not normal..

I can now get 4h from the display, 1h of call with sync on gtalk and gmail calendar agenda in sync allways on...and can go trough 14h..for me is enough...the call are over BT so for me is more than OK...

There are various thread here about battery life take a look on them, maybe they can help you ;-)
[Galaxy S II General] davestavros:
It may be that you had a dud battery. I was going to start a new thread about this but mine may have been an isolated incident.

I got my SGS2 from O2 UK the first day it was available on PAYG (one of the ones that came unlocked if that helps narrow it down). I loved the phone but it would get really hot and the battery would only a few hours even if there were no apps running and push notifications were turned off. The battery was at 45C+ whenever I tried to run anything. Eventually the battery would not even charge because android said it was too hot. Mine may have been a one off but there are quite a few posts on this forum talking about hot phones and poor battery life. Maybe it was a bad batch of batteries.

Unfortunately, I didn't do anything as smart as noting the serial number before I took the phone back. I got a replacement phone because the batteries are not available separately so I don't know if it was the phone or the battery that was the problem. The new phone and battery easily last a full day with 3 pushed email accounts on 3g + general use throughout the day.
[Galaxy S II General] AngelAbaddon:
I'm still not sure how I feel about the battery. It does last a while if I don't really do much of anything, but as soon as I boot up anything more intensive than say, Facebook, it quickly drags the battery down. This is with 2hrs 36m Screen time:

EDIT: Also, I'm not sure whats up with Copilot, as it keeps popping up on the list recently with no use details. Could be a hold over from when I last used it.
[Galaxy S II General] EmilianM:
I think you really have a problem with the battery.... with mine I have more then 2 days with normal use , but with heavy use, if I really use this all day long, I never succeed to consume the entire battery power form the morning until evening the same day.
[Galaxy S II General] kreoXDA:
Your idle graph is near perfect. But...

Note how your graph crashes down whenever your display is on.

I am guessing you abuse the battery with Tower Raders and Angry Birds too much.

I am an addict of Robo Defense myself and can tell you these games although not really 3D are wasting battery too much. Maybe they are not optimized for the SGS2. If there are settings in the games that let you decrease consumed resources, use them. Or just play less, and set the display on low.

Also, give the batt time to fully "adjust", a few charge/discharge cycles.
[Galaxy S II General] AngelAbaddon:
Fair enough, although only roughly 40mins of that 2 1/2 hr screen time is gaming. I wasn't sure if the drops where meant to be that severe, especially since the CPU gets hotter than what I would expect (Theres another thread regarding this somewhere) but if thats generally what its like for gaming for other people, I'll just see how it goes. Its been on a few cycles as I've had it around a week and a half now, and when I'm using it for social updates/RSS stuff its not all too bad, just a shame that 2D gaming annihilates it (Words With Friends is the worst, but supposedly that actually has a bug in it that causes to destroy the battery).
[Galaxy S II General] kreoXDA:
my personal record is 1.5 days with screen on 3.5 hours and 1 hour of Robo Defense gaming (really a drainer game). I think RD drains 10% of batt for every half hour played. Otherwise I get 2% drain in idle with all syncs enabled and Exchange push. No big diff if I am on wireless or wifi.
[Galaxy S II General] arekkaras:
Here is mine,

12% of battery left

46 mins of calls

display on for 2 h 30 min

WIFI only 12 mins

Push email on (manual from midnight to 8.00 am)

Social Hub on

Whatsapp (moderate use)

Also, yesterday I used only 3G and switched to 2G around 1AM today.
[Galaxy S II General] ekerbuddyeker:
My experience is that battery life is really poor.
[Galaxy S II General] DopyG:
Does anyone know if this or Nexus S (SLCD version) have better battery life?

I am getting SGS2, but these battery issues are scaring the hell out of me.
[Galaxy S II General] Ayrlupine:
This is bad? Sitting on 53% (changed to 52% just now)
[Galaxy S II General] CEPi:
Been playing with it for last few days, still not moved my sim to it, but did drive yesterday all day trhough France & Germany, and used it as a navigation only device, so on airplane mode, no other apps running, 100% brightness.

100% charge, it took exactly 2 hours 13 min to completely shut down.

Also I thought it's going to melt how hot it got, with no sleeve or anything, turned AC on a few times to cool it down since it's on a air-vent holder.

Got the wife's IPhone 4, 100% charge, Network on, TTom running, 3 hours 49 minutes till it died, only warm with a silicone case protector on.

Definitely something not right, if you don't play with apps alot and online stuff, sure it lasts normally, but what's the point of this mega screen super-computer that you need to charge it twice a day.

Did a complete restore since not much on it, same battery life.

Will play in next few days some more.
[Galaxy S II General] kreoXDA:
the screen on for 2 hours on 100% brightness - sure the screen will heat up, it is OLED - the pixels are actually tiny organic diodes that emit light when electrical current passes through them. The more light you want the more current must pass, the hotter the diode will heat up.

I was also charging twice a day when I first got SGS2, but I think it was because I was abusing it too much. Now the excitement for the new toy wore off, I am back to normal usage: 15 min of voice, multiple email sync and read, occasional photo or video, occasional app, hour of either gaming with background MP3 playback or movie watching, hour of browsing. I charge once a day, overnight, and feel pretty comfortable that it will last a day. I would say my screen is at zero brightness most of the time. Occasionally I raise brightness - I learned the screen is the biggest power consumer in normal usage, second biggest when gaming.
[Galaxy S II General] CEPi:
If Steve Jobs would say that, probably most of the world would agree, but i can not accept that this gorgeous screen needs to be on 10% brightness so we can make it during the day without a charge, or that it will get too hot because it's so advanced.
[Galaxy S II General] Nietzschean:
I still have a Nokia E51 at the moment but wanted to switch to a "smartphone" so I could do some browsing/youtube/mp3's during my commute to work, basicly.

Not getting an iphone in any case.

After having read reviews on several sites about the s2, I dropped by a store today as I headed home from work and ordered the it.

After reading all of this (and loads more on other sites) I'm cancelling it first thing on monday. Having to recharge your battery twice a day/being able to drain it in 4 hours is absurd and renders the phone 100% useless as far as I am concerned. Here's hoping I'll get my 100€ back without too much of a fight.