yashsingh1/xdaforums huggingface dataset:
[AT&T Samsung Galaxy S II SGH-I777] naturefreak85:
Everyone always says that the OS needs about 1 week of time to Calibrate and Report Accurate battery stats to me always sounded a bit off. I remember a while back I saw something and personal experience seems to chime in with it, battery life is dependent on New Phone Syndrome. When you get a new phone, you play with it more than you normally might, changing settings fine tuning how it is set up, and more. After 1-2 weeks the novelty of the new device has worn off and you settle into your true normal usage patterns, this is why the "adjustment" period is different for everyone as well as no one can give a definite time.
[AT&T Samsung Galaxy S II SGH-I777] hlb3:
I'm pretty happy with mine so far. I picked it up yesterday, played with it a while, fully charged and left it unplugged last night with everything on (wifi, GPS, etc) and after 8 hours at idle I lost 4%.
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
That is true as well :) But battery stats do take some time to build up as well. One-week is the rule of thumb not scientifically accurate at all.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
And that varies from device to device. Unfortunately the datasheet for our fuel gauge (MAX17042) is not available, unlike the MAX17040 used in the original GalaxyS series and Infuse. (Technically it was a part of the MAX8998, but it was functionally identical to the 17040.)

The 17040 did not require any calibration AT ALL.

And depending on how the 17042 works, it may not require anywhere close to the amount of calibration that coulomb counter type fuel gauges (such as those found in most HTC phones) do.

I found on the Infuse that I could suffer extreme battery drain from the sync process in situations of weak signal. It turned out to be one of the few cases where codeworkx's cpuidle fix in the kernel made a MAJOR difference for battery life. After implementing that fix, battery drain when the problem occurred was still high, but FAR lower than it had been before.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
I give up with my phone. Im starting to think that maybe i got a bad battery from samsung. my phone drops a couple percent per hour in idle and some ****ty 10 dollar batteries i got off of ebay almost work better as my samsung battery. Ive debloated the phone and have wifi and gps off but it still uses a ton of battery
[AT&T Samsung Galaxy S II SGH-I777] dmnall:
I am pretty sure if I was getting 18 hours of moderate usage out of my Cappy *RIP on this phone*, I am awaiting my sgs 2 and I am pretty sure I can squeeze out pretty close if not more. But will need to root, install my apps from my tibu folder from the cappy minus darkyrom tool, will need to get the sgs 2 version of darkyrom. Hopefully can get this beast to run better with a custom rom..

Cheers,

Charlie
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
Absolutely agree. My situation was different than others. It was not a matter of "mine only gets 4 hours of screen time while the world gets 5hours, my phone must be bad". It was more like..100 to 25% over 13 hours of standby and 8 mins of screentime. I don't think waiting a week will help that out.

Also the phone would barely charge when plugged into a pc..the android os was using almost as much power draining it as the power that was supplied from the usb via pc.
[AT&T Samsung Galaxy S II SGH-I777] mbze430:
all I know is this... I went to bed last night at 3:30am with 44%. left the phone without charge... woke up at 10:00.. phone is dead. Why? Facebook app kept it awake for 6hrs and the rest was Android System.

Not sure why Facebook app is doing that to me!
[AT&T Samsung Galaxy S II SGH-I777] eep2378:
I'm not trying to sound harsh, but the fixes in the OP, are pretty obvious one's. And anyone whose ever owned an android phone, would try all the "fixes", without even a second thought.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
Agreed. They are obvious fixes that ive already tried and im still getting **** battery life
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
It really depends what you have installed or what you have configured your phone to do. Check the battery usage stats to see who's the biggest battery hog.

I personally have to disable my Hotmail calendar sync because the email app has a bug that will constantly sync calendars with Hotmail even though there is nothing to sync.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Facebook is notorious for holding wakelocks when it shouldn't.

Facebook is the #1 reason to keep a task killer around these days for many people. Skype is #2.
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
Did you guys read the second part of the fix? The fix that helped me was with a re-flash of the stock kernel. I don't think this is very obvious when it comes to owning a brand new phone.

Coming from iOS, I knew that android had more freedom and customizations. The last thing that came to my mind was..."oh I need to go home and odin my phone so the phone can be useable"...
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
Unfortunately, that's cost of freedom. Android is a good example of that. In many ways, it inherits many things from Windows Mobile.

If you don't want to tweek, stick with iPhone or WP7.
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
I seriously doubt that all 40% of the market (market share of android) are computer geeks like us who heard of "odin" or "kernels". How is android so popular if they ship out broken phones and it's up to the user to get it working?
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
I see your point and do agree it may not seem obvious, however, i did try flashing the stock kernel with no increase in battery life. i am almost out of options as i have spent hours and hours searching online for fixes and ive tweaked my phone to be as minimal as possible. the only possible explanation for my particular problem is a bad battery.
[AT&T Samsung Galaxy S II SGH-I777] Simba501:
Customization. No other OS offers it to the level that Android does, out of the box. And perhaps the wide range of device designs available.
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
90% of the Android users don't give a **** about how this works or not working. And out of box, the thing is not broken (I personally don't have to do much except the Hotmail bug). Most ppl posting here just try to get the most out of their phone. And I do hear quite some casual smartphone users jump ship to iPhone from Android. I personally don't buy Android phones for my wife and kids.

Android has the momentum, buzz and a lot of phone selections. That's what makes it market leader, IMO. For ease of use and stability, you have to give it to iPhone and in some degree WP7.
[AT&T Samsung Galaxy S II SGH-I777] eep2378:
Maybe you just got a bad battery. Maybe exchange
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
Well people with battery problems on the galaxy s2 in which idle is killing their battery life is considered broken to me. I am not on this forum trying to make my galaxy s into a super computer. I just want to put a stop to the battery life drainage...I want to know that if I have 60% battery life before bed and I set an alarm..I can get to work on time the next morning.

This may just be an isolated ATT thing because I can't find anyone else with the international version having this problem. I see them complaining about the battery life..and that's pretty much it.
[AT&T Samsung Galaxy S II SGH-I777] simulatordos:
This phone has the best battery life of any android phone I've owned, including the Captivate and HTC Inspire. 2% every hour during idle is far less than the 4% that was usual on the Inspire, even with tweaks.

Certain programs will suck power. Check update settings and turn off auto update on programs like Twitter or MLB.

The phone definitely does a lot better while on wifi managing power, though. And it, like most android phones, sucks hard when there is a weak cell signal its trying to connect to.

Non-rooted, stock kernel, two google accounts, exchange push "on".
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
I agree with the battery life. After I finally fixed the phone, my battery life has been pretty good. Probably can get close to 7-8 hours worth of video playback on a single charge, which beats out my iphone 3gs. Before the fix, I couldn't get more than 2 hours. 2%/hour sounds kind of high, but not crazy high.
[AT&T Samsung Galaxy S II SGH-I777] ljwnow:
I have no complaints with the battery life. It is better than my inspire.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
After manually debloating, I get slightly less than 1% an hour at my apartment (moderate signal)

At my desk at work it's a little over 2% per hour, boo for weak signal! (bouncing between 1 bar and no coverage).

Weak signal will always increase your battery drain.
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
Do you have any info to compare this to what you were seeing for battery drain in the same situation, but stock?

This seems comparable to what my wife's device is getting (not quite that good, but close) but I am seeing about 5% per hour idle with my device, with decent signal strength (3-4 bars) I'm not seeing many unexpected wakelocks, and no apps with runaway battery use percentages. Her device indicates 0% time without signal, mine shows 100% time without signal...
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
I have a cell tower right across the street from my apartment so my signal is very strong and i am still getting a ton of drain. im not asking for some godlike battery life. all im trying to get is the same battery life that some of the users on the forum are reporting. if their phones can do it i dont see why mine cant. im gonna order a replacement battery off of samsungs website and see if it is any better
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Unfortunately not - I saw all those services and immediately had an urge to kill.

100% time without signal seems to be one of the reporting bugs in our device.
[AT&T Samsung Galaxy S II SGH-I777] OaklandR:
12 hours and 86% left. So far it's been better than my Galaxy I. :)
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
The phone does not always idle just because you are not using it. It's the nature of the modern OS. There are million services constantly running on the background. It all boils down what you have configured and what you have installed. A mis-configured email can consume a lot of battery juice and data. Common example is those with POP3 account set the phone to check email too frequently. And those with POP3 or IMAP may have thousands and thousands emails left in their inbox. All these emails have to be downloaded into your phone in the first couple days because these email protocols can't control how to sync past emails. On the exchange ActiveSync, the default is only sync past 3 days of email. Gmail is similar.

And a badly designed app can often cause similar issue as well by preventing phone goes into battery saving idle or sleep cycles.

Ppl always complaining about battery life whenever a new phone is released. I and many others have posted that we don't have a battery life problem. So, just because you have a problem doesn't mean there is a wide spread battery problem on AT&T. In fact, the battery life is much better than my previous Captivate.
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
If you read one of my "fixes", one of them is "return it to att for a replacement". I recognize that this problem is uncommon (because I called samsung and went to the att store to see if this is a common problem). This is why I urge people to get a replacement phone because the initial install of the kernel may have been bad.

You have no idea how fraustrating it was to turn off EVERYTHING, even had the phone on edge using juice defender. Having none of the updates enabled (no email, no aim, no skype, NOTHING) and STILL have the phone drain 5-10%/hour. Called samsung and tried every trick in the book and still, no help! The kernel re-flashed solved my problem, just trying to spread the word. Frankly I recommend people get a replacement because re-flashing may void the warranty.
[AT&T Samsung Galaxy S II SGH-I777] Dxtra:
This is my fourth android phone and with each an every one of them there's was thread on here reading " Battery Sucks " Really not mines. I was poking my phone yesterday with the screen reading 5 1/2 hours of on screen time and 20 hours since last charge and I had 10% battery left. For those having battery drain I suggest follow some suggestion posted by some user on here. The battery life on the SGSII is acceptable.
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
I'm with you on this Singuy - I'm kind of anal about battery life - I'm tracking wakelocks, time in deep sleep, screen on times, etc. etc. etc. (been tracking this stuff regularly on my Aria over the past year or so trying to optimize, so I at least have a little idea what I'm doing). As I sit here, my wife's SGSII has 79% battery remaining with 9.5 hours uptime, 1 hour display on and 15 minutes of voice calls. Mine has 18% battery left with 13.5 hours uptime, 1hour 45min screen on, and 2 minutes of voice calls. I had 63% deep sleep today. She doesn't have cpuspy or BBS installed, so I can't compare - but comparing performance alone tells me something is wrong with my device.

I'm inclined to try flashing a kernel (i'm straight stock unrooted now) but I think I'll just try returning it first - just in case it is a hardware issue.
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
Instead of flashing a kernel, did you try a factory reset?
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
Duh - guess I should maybe give that a shot before I haul it back to the store. Sometimes the best solutions are the simple ones you're blind to. Thanks for the suggestion Foxbat.

Edit: Ok, factory reset at full charge this morning, installed the bare minimum of apps I need to get by, did the status check thing to get my time without signal to start dropping, and will do a trial run for a couple days. Right now appears to be better: 1hr 12mins off charge, 47 mins display on, 92% battery left...
[AT&T Samsung Galaxy S II SGH-I777] Div033:
My girlfriend just got this phone on release day and I've scoured this thread to see what the deal was with battery. She mentioned that on a full charge it lasted about 12 up and 2.5 hours awake. That's pretty low, and that's coming from someone who uses an incredible. Seems that its hardware/signal related in some cases, as hers reports 100% without a signal when she definitely has it most of the time.

I don't know how CDMA compares to GSM concerning battery life, but I generally expect far less battery life when I'm using 3G for the majority of the time. WiFi definitely consumes LESS power than 3G during use, at least for me. I assume that since she's always on 3G this could be negatively impacting her battery, especially since she mentions she gets poor/no signal at work now (which was perfectly fine when she had a cheap blackberry ripoff feature phone...)

So, knowing that she no longer receives signal in areas she used to and is seeing the 100% w/o signal stat like others affected by bad battery life, could one assume that there is something wrong with the phone's modem/radio and the only way to fix it is a replacement?

I'd think AT&T would be reluctant to give an exchange regardless.

Sent from my Droid Incredible using the XDA app.
[AT&T Samsung Galaxy S II SGH-I777] hlb3:
So after my first cycle it was on battery for 18 hours, screen on for 5hours 15min, plugged it in at 8%. The up time was mostly web browsing, downloading apps, arranging the home screens, and playing games, so I'm pretty happy with the numbers I got.
[AT&T Samsung Galaxy S II SGH-I777] dawhoo:
26 hours from 100% until the phone cut itself off.

Display 36% 4h 5m

Android System 19% (CPU 26m 28s, Stay awake 29m 52s, Data Sent 13.65 KB, Data Received 7.53 KB)

Voice Calls 15% 46m 19s

Android OS 14% CPU Total 1h 16m

Cell Standby 6% Time on 1D 2h 3m (Time without signal 23%)

Phone Idle 4% (Time on 21h 58m)

Everything else was 2% or less.

Not great, but not bad either.
[AT&T Samsung Galaxy S II SGH-I777] Simba501:
I think that's great. I get 3 hours of display time, which I think is excellent lol. Though, I do have Gmail syncing automatically (with numerous labels as well) and I generally receive a lot of emails, so hopefully this is the only reason why I don't get what other people I've seen get.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
The 100% without signal report is a reporting bug in the battery stats app.

It's part of why I don't entirely trust the battery usage screen.

I get about 1% per hour idle drain in a moderate-signal situation. CPUSpy reports deep sleep percentage at 94-95% when leaving the phone on the shelf overnight.
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
Continuing to try to diagnose my drain - Entropy, are you on Wifi for data with your 1% drain per hour overnight, or getting data from your moderate 3g signal?

Stock, with on and off usage during the day I'm seeing about 66% deep sleep. This is consistent with what I saw before factory resetting. I guess I'm gonna have to have some patience and do a drain test overnight. sTarting to think my previous issues were due to some application I installed, though I'm not sure which one....nothing was getting reported in battery usage or wakelocks that should have caused it, that I can tell. I have NOT logged into qik since the reset (think I read somewhere that might be a battery drain culprit - though was never reported in battery use for me before.)
[AT&T Samsung Galaxy S II SGH-I777] zgr8jakez:
It's a rogue app (or 2)

Flashed Kernal and started turning off services. still high

Factory reset and added 1 app per hour 1 min on screen 1 hour screen off then reset to check battery level. Found thumb keyboard for some reason stopped it from deep sleep. and still have about 20 apps to work in to see what else bugs it out. very annoying but getting huge results might want to open a battery draining (blacklist apps) thread.

also use power saving mode to stop google sync (i find it a valuable service)

and lattitude location pulling uses allot so set that to manual
[AT&T Samsung Galaxy S II SGH-I777] gqonmars:
Nope, it lasted 15.5 hours to 8%. Sucks.. This is without live wallpaper with Juice Defender. I have about 7 widgets running and I notice that there are lots of bloat services running.. and they restart after I kill them.

Social Hub (2 services)

Voice command ( 2 services)

TetheringManager

Facebook

Media Hub

Ap Mobile

Buddies now

.. and many more.. yuk..

They dont stay dead after I kill them.. ARGGGGG!!!
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Classic AT&T bloatware.

The SNS services related to Social Hub and such are notorious for being bad for battery life.

The SisoDrmProvider APK in /system/app is used by Media Hub to check DRM licenses - the problem is this checks EXTREMELY often and checks even when you don't have a single piece of DRMed media on your phone! As a result it's one of the first things ROM cooks nuke.
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
If your phone is rooted, get Titanium backup from market place and delete those apps! That's what I did with mine.
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
Thanks for the tip on thumb keyboard here - had that on prior to my factory wipe and was seeing high drain. I didn't install it after the wipe, and I'm seeing better life over the course of today.

When I had thumb keyboard installed, I did NOT see it showing up in excessive wakelocks or as an item causing battery drain in the about>battery screen. Curious how you diagnosed that it was causing the problem?
[AT&T Samsung Galaxy S II SGH-I777] zgr8jakez:
After wiping i added each app one by one and waited a hour between each to see if there where any major changes in deep sleep or battery usage. When i installed thumb keyboard there was no deep sleep until i uninstalled it a hour later then everything was back to normal. I use it on my transformer with no problems though.
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
Did you use CPU spy. I have thumb keyboard and it deep sleeps like 96% of the time
[AT&T Samsung Galaxy S II SGH-I777] phonic:
I got my SG2 this past week, and I was also noticing that my battery seemed to drain quickly. The first couple days, I could barely get home from work with more than 20% left. But I made some tweaks and now it idles at <1%/hour drain. First, I disabled all the email pulling. I use the gmail app for personal and the k9mail app for work, and both support push, so I turned any automatic pulling off. Second, I turned the brightness down all the way. I also have GPS turned off. I also checked all my other apps (weather, facebook, etc.) and set the auto-refresh to 3 hours.

I think those changes made a huge difference, because today was significantly better. I unplugged the phone from the charger (100% full) at around 10AM. By 12:30PM, I still had 99% remaining. I checked some emails and spent about 15 minutes using it, and had 97% remaining. At 4PM I checked again, and I had 95% remaining. I used it for about half an hour (phone, email, etc.) and got down to about 89%. At around 6:30, I had 87% remaining, but didn't use it. At around 8PM, I had 85% remaining and played with it for about 20 minutes, bringing it down to 83%. At 10PM, I had 79% remaining, and played Angry Birds Rio for about an hour. It still has 76% left. So it's been off the charger now for 13 hours, has had about two hours of activity, and still has 75% battery left. This is pretty good to me!

Figured I would share my metrics for the day.

So if you are experiencing battery drain quickly, checking on the above can help.

Also, I noticed that Words with Friends is a HUUUUUUUUUUUUUUGE battery hog. I played it last night, for the first time, with my wife, and I was losing 1% every minute or two. Checking battery usage, it was in double digits with a high CPU usage mark too. Not sure why that is, but FYI.
[AT&T Samsung Galaxy S II SGH-I777] simpl3lang:
what would be a normal battery drain for our i777 anyways? my old phone, the streak5, with its big a** screen, on deep sleep (when i leave it for a good 6-8hrs while i sleep) it still stays 100%. even my streak7 (notorious for killer battery drain) can hold a 100% charge at long time when not being used. here im reading that the s2's 1% drain for 2-3hrs on idle is great.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Really depends on signal strength and how many background tasks you have.

My Infuse got a bit less than 1% per hour on idle with WeatherBug, Facebook, and Google syncing on a cellular connection in my apartment. Went up to almost 2% at my desk (weak signal). Deep sleep percentage was around 95%.

Throw it into airplane mode and deep sleep percentage goes up to 99% and it loses 4% every 24 hours.

My GS2 seems to be matching the Infuse in battery life despite having a smaller battery.
[AT&T Samsung Galaxy S II SGH-I777] simpl3lang:
when i had my streak5, the only thing turned off was auto sync. Even had yahoo messenger running lol.

My s2 right now is bone stock and rooted. I havnt installed any. Only use web and text. 2hrs passed since full charge and very very lil use. Im down to 93%
[AT&T Samsung Galaxy S II SGH-I777] _icemanu:
My battery usage seemed okay to me on very light usage.

Here is my stats:

Battery Level : 52%

Time : 1D 4hr 15min

Display : 26% (1h 31mins)

Android Systems 26%

Android OS : 13%

Stock phone with Gmail, Google Voice, FB, Twitter, Weather, Voice Command widgets and all other AT&T stuff running.
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
A day and a half after factory reset (still on first charge after the reset):

31.5 hours off the charger, 3 hours 20 minutes of screen on time, 81% deep sleep, and 13% battery left. Whatever that reset did, I'm now getting excellent battery life. Still stock unrooted.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
how do you factory reset?