yashsingh1/xdaforums huggingface dataset:
[AT&T Samsung Galaxy S II SGH-I777] WillEat4F00d:
How do you calibrate it?

Settings > About phone > Battery usage
[AT&T Samsung Galaxy S II SGH-I777] sweetboy02125:
I'm talking about live battery display. I installed no lock and have no lock screen to see how many % left.
[AT&T Samsung Galaxy S II SGH-I777] WillEat4F00d:
Just search up "battery indicator" in the Market and you'll get a few to choose from.
[AT&T Samsung Galaxy S II SGH-I777] RockRatt:
I too got mine yesterday and started tinkering around with installing apps and such to test out all functions before I rooted it and move onto cm7 most likely. The 1 things I noticed was that the battery was NOT completely full when it was first turned on at the store so once it got a little lower after playing with it I charged it up overnight. Today the battery was WAY BETTER and was not dead yet. I have been using it NON STOP today, rebooting it, testing it, trying to root it, rebooting some more, some time using tango to test it out, watched a Netflix movie, pretty much taking full advantage of it all day. I finally decided to charge it up and use my Captivate a bit. I didn't keep track of usage and times today but I KNOW it lasted a WAY LONGER time with all I was doing with it than my Cappy. Tomorrow I will check more out possibly before putting on a rom.

So LOOOONNNNGGGG STORY short make sure you charge it up once you get it before messing with it too much and then it will LAST LONGER.

Sent from My KickAss Captivated CM7 OC'd 1.5Ghz/Undervolted
[AT&T Samsung Galaxy S II SGH-I777] Zinge:
After two nights of completely draining then recharging the battery to full, the battery has gotten significantly better. I'm trying to drain it again before I go to bed tonight but I don't think I'll make it.

I played the entirety of Toy Story 3 on max brightness, and only burned 20% of the battery!
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
That would be caused by a fuel gauge which doesn't coulomb-count the discharge current and tries to estimate charge state based only on voltage and voltage history.

Which is exactly the kind of fuel gauge we have.

Unfortunately the datasheet for our fuel gauge is not publically available, but the one for its predecessor is. While the MAX17042 has some advanced features not present in the 17040, those features are disabled on our device.

Google MAX17040 for more information.
[AT&T Samsung Galaxy S II SGH-I777] mbze430:
Facebook app is battery hog. That or the Widget Facebook uses.

I used Watchdog @ 10sec interval polls and 1% threshold. Facebook would pop up every 10-15sec saying it is using 1% cpu. After I removed Facebook app, I was getting great battery life. Other item that shows up from watchdog was minor system stuff and they would only show up every 30-60sec.

Screebl is another one.. BUT.. you have to ask yourself about your own usage style. Because if you tend to read slower or have to do more then the 15sec+ pauses, this might "benefit" for those users. If you are a quick browser, and can do things within 15sec pause per session, you don't need Screebl
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
I don't use the Facebook widget, so haven't had problems with it recently.

However the Samsung social networking stuff relies on their SNS framework which is notoriously bad for your battery.
[AT&T Samsung Galaxy S II SGH-I777] jrl022:
All right, I have somewhat of a resolution to my ridiculous Exchange Account Wakelock devouring of my battery like Ralphie May through a cheesecake issue.

I kept trying different Exchange clients and they pretty much all had the same issue, so I finally went back to the stock client and decided I would just not sync the calendar (just for the hell of it). During setup I also left "accept all incoming SSL certificates" unchecked.

Setup went through fine and my battery has been about like it was pre-Exchange setup which is, to say, pretty damn good.

So pretty much 24 hours with normal-ish usage (I didn't purposely stay away from it like before, but no streaming or games that day) got me down to 9%. Went from 35% to 30% overnight. This is with Sync and Background data enabled and all the bloatware happily slogging away behind the scenes. I may or may not root to optimize this further, but I can live with this.

Now all I need to do is keep from making eye contact with the engineering degree in my home office for not following the scientific method. If it had a nose it would be pointed up at me.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
So it sounds like it's not just Hotmail that has calendar sync issues with the Exchange protocol...
[AT&T Samsung Galaxy S II SGH-I777] jrl022:
Unless it was the unchecking of the "Accept all incoming SSL certificates" box that did the trick. Like I said, I failed to properly isolate my variable.

Taking away calendar sync really doesn't affect me anyway. I have a Outlook/Google Calendar sync client running on my work computer during the week that pulls all my work stuff over to Google which means it's on my phone anyway.

If for some reason I happen to figure out which one of these things was the problem then I'll be sure to update. I'm not really keen on messing with a good thing at the moment, though. I'm a puss.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Heheh. My intuition tells me that it was calendar sync - especially considering how calendar sync with Hotmail is a known issue.
[AT&T Samsung Galaxy S II SGH-I777] WeldingRod:
well I need to use my exchange calender, and have it sync'd!

I wonder if this fixed the issue, or if there are mal affects from:

"unchecking of the Accept all incoming SSL certificates box"
[AT&T Samsung Galaxy S II SGH-I777] ngocdao:
Just carry an extra battery and stop hindering your phones potential
[AT&T Samsung Galaxy S II SGH-I777] hlb3:
My phone has been unplugged since Saturday at 6:00pm (53 hours), mostly idle, 3.5 hours of screen on time (1 hour of talk time) and I still have 12% remaining, that's with wifi, Bluetooth, and background data/auto-sync all on. The battery on this thing just blows me away.
[AT&T Samsung Galaxy S II SGH-I777] ngocdao:
Picture wont upload :( wanted to upload my scree shot
[AT&T Samsung Galaxy S II SGH-I777] dandrumheller:
HOLY S#17! Now that is impressive. I was happy with 36 hours up with 3.5 hours screen on. What set-up are you running? (ROM/Kernel/etc.)
[AT&T Samsung Galaxy S II SGH-I777] hlb3:
Cognition X2 beta 4/Entropy's Daily Driver #2
[AT&T Samsung Galaxy S II SGH-I777] zgr8jakez:
I finaly caved in and returned my phone after having it drop 40 percent in 4 hours in airplane mode. This was after I traded batteries out. The new one is much better. So instead of beating your head against the wall you may have a defective unit FYI
[AT&T Samsung Galaxy S II SGH-I777] swedishcancerboi:
SSL certificates are used for authentication back to the server. When you setup the Exchange account on your phone, it needs to verify the installed Cert (if your admin has one setup). Most phones now (meaning Android, iOS, WebOS) can automatically accept the certificate being presented to it (hence the box you unchecked). WinMo was a PAIN because you had to manually install the Cert first.

If you unchecked the box and were still able to setup the account on your phone, you should not see any ill affects.

I don't have a GS2, but I have a Captivate and fight this problem as well. If I don't put Exchange email on my phone, I can get through an average day with 80%+ battery power remaining (i carry a Tab so my phone doesn't get much action these days); however, if I add my exchange account my phone is guaranteed to die by the time I make it home. I've had this problem with Froyo and GB. Exchange heartbeat is set to 15 minutes.

I wonder if it is something on the server/mailbox side. We have a handful of iPhones that die within 4 hours unless you cleanup calendar invites and tasks and restart the device. With the known "Hotmail" calendar issues, it makes me wonder if there is a set of circumstances involving calendar meeting due dates/acceptances.....something.....with Exchange and it's apparently retarded calendar causing a handful of people grief. Like I said, maybe it's just a certain set of circumstances, like you get a meeting invite, accept it, then Exchange tries to remind you of it in your Outlook, but you snooze it instead of dismiss it, causing crap to flow to your phone's calendar, which it doesn't understand, then causing the oceans to rise and earthquakes to roar......
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Batteries are never completely full from a store, because storing batteries at maximum charge causes them to lose capacity FAR faster than storing them at 40-50% SOC.

Drain it fairly deeply and recharge it a few times.

One thing I probably should mention - I manually debloated my system image. As a result a LOT of services that normally run don't even start on my phone. Social Hub, SNS, the AT&T Hotspot crap, Telenav, etc.

Classic AT&T bloatware. Even if you uninstall the crap they allow you to uninstall (an improvement from older AT&T phones), there's still a horrific amount of services running. I know on the Infuse there were some DRM services associated with Media Hub that were notorious for eating battery.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
I would definitely love to know what these services are because ill probably never use them and dont want them eating up battery.
[AT&T Samsung Galaxy S II SGH-I777] cliffgardner:
I don't mean to be coy but 'first time Android user' explains it all. You'll find that this phone is on par with all Android phones, if not a little better.
[AT&T Samsung Galaxy S II SGH-I777] nyamoV2:
the other day i made it 20hrs and down to 30%. granted that was like 2 1/2hrs of screen time. but overall i say this battery is pretty solid, or much more so coming from an inspire and its dinky battery
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
I fixed my battery drain problem finally.

Android os was running way to high i dont care what anyone says. It was running for like an hour cpu total time at the end of the day and would be dead.

What i did was factory reset. Then flashed over to cognition beta 2 and froze media hub. So if anyone else has battery drain problems try one of those options.

Now i have been unplugged for 10.5 hours, 65% life left just over an hour display time and android os is only 12% with cpu time of only 17minutes...sweet
[AT&T Samsung Galaxy S II SGH-I777] gerelee:
6 hours out of your thunderbolt? you're one of the lucky ones, lol ;)

oh btw, my sgsII was at 40% after 10 hours ... so that's pretty damned good, not a heavy use day, but still MUCH better than any other android i've owned and i've owned a lot of them!!!
[AT&T Samsung Galaxy S II SGH-I777] Cdub5:
For everyone getting great battery life, is this with your data network turned off? I don't have a sgs 2 yet, but I've been reading the forum to get myself ready for one. I ask about the data network, because my cappy sucks when I have it on. I used many, many different roms, and the only way I can get great battery life is when I'm connected to wifi or nothing. If I don't connect to 3g data network, sitting idle my phone (I have 2 cappys, same story) drains about 15-20% in about 8-9 hrs. If I connect to 3g network, I lose the same amount in about 2-3 hours. I ask because I want a phone that I can leave connected, but not have to charge my battery after 7hrs or less.
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
My network data backround data and sync are always on. Sittin at 53% after 12 hours unplugged and over 2 hours display
[AT&T Samsung Galaxy S II SGH-I777] mbze430:
I also manually (via Root) removed all the AT&T CRAPWARE... and some of the Samsung CRAPWARE.. stuff I know I'll never use...

After two days of heavy use I am getting about 5.5hrs on usage down to 19%
[AT&T Samsung Galaxy S II SGH-I777] stickbo:
God I feel ya. I have 2 inspires here and just got a gs2 monday. The difference in battery life is night and day. I can finally get a full days use on one charge. Love this phone.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
I feel like this isn't good
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Looks like you've been using it pretty heavily.

However there is a fairly long stretch where the device is awake with the screen off - something is wrong there.
[AT&T Samsung Galaxy S II SGH-I777] jetarpon:
Does anybody know what the difference is between green and yellow on the Phone signal bar?
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Green is high signal (how high? I don't know... mine was yellow all night) - maybe max bars?
[AT&T Samsung Galaxy S II SGH-I777] sweetboy02125:
Man, Look at this battery. I never can archive this with the Infuse, Nexus S, LG Thrill, Samsung Focus... may compare to the iphone4 :)

GALAXY S2 RULE
[AT&T Samsung Galaxy S II SGH-I777] Milkshakes00:
Uh. I'm sitting at 10 hours, 25 minutes, 17 seconds unplugged..

87% Battery Life.

Display is sitting at 36% of usage, while Android System is at 24%, and Android OS is at 12%.

This phones sips battery like no other. My Captivate couldn't pull off these numbers.
[AT&T Samsung Galaxy S II SGH-I777] DJSLINKARD:
Yikes i knew something was wrong. What would you recommend i do? Im new to android. Is there a way i can factory reset?

edit: device is rooted. dunno if that helps or not
[AT&T Samsung Galaxy S II SGH-I777] contentryder:
I managed to get 5.5 hours of display being on today with GPS and sync active. When I first got the phone, battery life was poor. Things are looking up!
[AT&T Samsung Galaxy S II SGH-I777] ngocdao:
exactly what I said to my friend.

Having an iPhone as a primary device in the past 3 years and having owned all of AT&T's android devices, I can say this is finally the ONE phone that leaves me very content, mostly with it's speed AND battery life.

:D

Some advice (settings I use to prolong battery life)

-Screen timeout: 1 minute

-Touch Light Key: Only in the dark

-Wi-Fi, GPS, Bluetooth, Auto Screen Rotation: Off (until I need it)

Remember that a longer screen timeout is better than a short one that forces you to keep pressing the wake button on and off and on and off---just as a computer uses more energy shutting on and off than just putting into sleep mode until the next hour you plan to use it.
[AT&T Samsung Galaxy S II SGH-I777] jetarpon:
I use a short timeout and screebl, so it stays on when I'm using it, but turns off when I set it down.
[AT&T Samsung Galaxy S II SGH-I777] gqonmars:
I got the At&t SGS2 on Sunday when it came out. And the past 4 days, I have noticed that it was lasting only about 12 hours with moderate use. I have lots of widgets and the crazy cool looking KOI live wallpaper. I am guessing that these are big drain of battery as my Android OS was costing 75% of the battery use. (I have my screen dim)

I will try to disable the live wallpaper and report back..

This is not good as I wake at 7am and the batter dies at 7pm.. yikes...

Any way to disable the 3g/hspa and use edget when I am low on battery?
[AT&T Samsung Galaxy S II SGH-I777] dross50:
I'm really happy with my battery. I'm on CM7, overclocked to 1.6GHz and I lost about 1% per hour idle.
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
Im in the process of trying to figure out if it is qik video chat or social hub or some other app. I think qik video chat could be the problem.

Anyone who is getting bad drain while idle are you logged in to qik video app?
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Settings->About Phone->Battery Usage

Also, look for wakelocks in BetterBatteryStats. It's a paid app on the Market but it's free for XDA members from the author's thread.

Unfortunately the stock AT&T firmware has a LOT of background services running, many of which are likely buggy in terms of battery usage. I know that the Infuse stock firmware had a lot of drain problems with SisoDrmProvider which our device also has - the version on the Infuse checked in with the mothership WAY too frequently even if you didn't have a single piece of DRMed media on the phone. Unfortunately I don't think you can remove this without breaking Media Hub.

In my case, I never purchase DRMed media so I didn't care and I yanked SisoDrmProvider, Media Hub, and a lot of other DRM-related stuff, although I need to check to make sure that what I yanked didn't break Netflix...

Edit: Netflix still working, although I did leave in one or two DRM-related items that weren't showing up in Services.
[AT&T Samsung Galaxy S II SGH-I777] Simba501:
+1!

.......
[AT&T Samsung Galaxy S II SGH-I777] ngocdao:
12 hours is pretty damn good for a smartphone..... esp android....
[AT&T Samsung Galaxy S II SGH-I777] mbze430:
CPU Tuner "seems" to have that function with the profiling to go 2G... BUT I can't say it actually works, because I had a hard time configuring CPU Tuner with the ATT SGS2
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
Media hub sucks anyways. So what drm stuff is safe to remove or what should i leave on. I dont care about losing media hub
[AT&T Samsung Galaxy S II SGH-I777] dennishhh:
G2S

After reading all the bad reviews for the last four months about the galaxy S2 battery usage I was prepared for the worst! Instead the phone is much better than my iPhone 4 ever was. Charged it for the second time yesterday at 2:30 today at 2:30 it was at 25%. I've been using it as much as my iPhone 4 and seems to last 75% more. I'm going to let it run down to zero and recharge.

Wi-Fi, Bluetooth, GPS were on about half the time. Auto-sync is turned off and I have background data on.
[AT&T Samsung Galaxy S II SGH-I777] dan40hands:
I'd replace that, because mine ate up 1% battery life after 2 hours on idle...I'm running stock with JuiceDefender app...thats about it
[AT&T Samsung Galaxy S II SGH-I777] bubba11:
new att S2 - bought Sunday.

I noticed a quick battery drain, or perceived it

so, i just turned off GPS, Wi-fi

installed 'JuiceDefender' found at Market.

I'm on Day 2 or ~ 35hrs w/ still 46% left

light to average use.

of course, i'm no smartphone guru or even close.

and i aint sure the JD was a smart choice either.

but i'm pleased at the battery life
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
Hey can you tell me if you have signed in or used "qik" or "media hub" at all. Thanks
[AT&T Samsung Galaxy S II SGH-I777] dan40hands:
Thats ridiculous (in a positive way of course)...SGSII has the best battery life of any smartphone I've ever had so far, but its only been 4 days...

---------- Post added at 04:46 PM ---------- Previous post was at 04:26 PM ----------

I used both, but killed with stock task killer. No issues
[AT&T Samsung Galaxy S II SGH-I777] ranova:
thats a horrible suggestion.

The reason why yours only uses 1% battery after 2 hours is BECAUSE of juicedefender.

OP, dont exchange, use it for a few days
[AT&T Samsung Galaxy S II SGH-I777] Singuy1234:
Update and FIX!

My phone is no longer draining massive amount of batt life when idle (3-5% after 7 hours of idle), android os usage is now down to 5-15% instead of 78-97% from before.

My fixes.

1. Turn off data syncing

2. Turn off wifi while on the road (so wifi doesn't constantly look for signals).

3. Clear memory

And if you are still having problems (like myself..I did all of the three above and still had severe battery drain). Then

1. Take phone back to att and get a replacement

OR

2. Re-flash your android with the STOCK kernel found here

http://xdaforums.com/showthread.php?t=1286432

NOTE** This will root your phone, you will NOT get the exclamation mark when boot up, but kernel counter may be at "1" after this process.

Re-flashing my phone worked for me..finally my phone is no longer crippled with crappy battery life.
[AT&T Samsung Galaxy S II SGH-I777] naturefreak85:
Exactly. JuiceDefender shuts of data hence no battery drain.

In my neck of the woods, I've always gotten subpar battery life with ANY device. Part of it is due to the widgets and addons manufacturers add, the other is actually the network.

On your phone you always see H+ no matter what. That's a lie. Not all area's are H+. In my area, some parts are H+ and some parts are still UMTS. This isn't that much of a problem because it should be nicely spread out, it's not. My phone is constantly switching between H+ and UMTS. Whenever I have travelled to Washington DC or New York I actually notice BETTER battery life. In South Florida where I am, the phone is switching between H+ and UMTS every minute even if it isn't moving.

Before I had the Galaxy S II I had the Motorola Atrix, and there is actually a different icon for UMTS and HSPA. I will say CM7 actually doubled the battery life on my Motorola Atrix and I anticipate it will increase the battery life on my SGSII as well once I decide to go for it.

Another observation, when I was trying to drain my battery for the first time, it seems to be that the draining is uneven. With the SAME usage, over the course of an hour, the first 30 minutes I will lose 5% and the second 30 I will lose 8%. Just reading a book on Kindle. I also noticed a slower drain as I hit sub 30% I figured it may be throttling but hard to say, playing a game for an hour on it only dropped me down from 17% to 15%.

None of the battery problems seem to be hardware, it's all software which is somewhat evidenced by my experience with my Atrix which I would have to charge before I left work and 6 hours later it would be dying (before I switched to CM7, then I got 10 hours) I realise I am a heavy user, but I usually only have 2-3 hours screen on time off a charge. For that there is another factor clearly and it seems to be the network, and somewhat the software.
[AT&T Samsung Galaxy S II SGH-I777] gqonmars:
I installed JuiceDefender half way through with the LiveWall paper off and it lasted 24 hours with battery at 16% left. I will now try a full day with Live Wall Paper with JuiceDefender. I hope its like what others have posted achieving 40+ hours would be tremendous.

I will report back Phone is charging now gearing up for the test..:D
[AT&T Samsung Galaxy S II SGH-I777] MikeyMike01:
JuiceDefender doesn't actually help battery life under normal conditions.
[AT&T Samsung Galaxy S II SGH-I777] naturefreak85:
I have to disagree, it helps quite a bit in standby/idle. Since it disables the data connection which is one of the biggest draws of power in standby it does help quite a bit with battery life throughout the day.

When using it with my Atrix which I was lucky to get 6 hours with (including standby) I increased my battery life to 8 hours. The downside was I wasn't getting notified of emails when the screen was off because JuiceDefender was stopping the mobile data connection.
[AT&T Samsung Galaxy S II SGH-I777] foxbat121:
The data connection alone doesn't consume that much battery juice (a little but not that noticeable). It's the actual data transfer that does it. However, the reason I need a smartphone is so that I want all my emails pushed and other informations exchanged automatically, in standby or not. So, for me, disable data connection or turn off sync is not an option. I have 3 push email accounts running with occasionaly weather updates. My GS2 is perfectly fine holding > 50% of battery at the end of the work day. I consider than very acceptable battery life.

You can archive the same effect by not installing apps that do background data transfer or configure your email to only sync manually. There is really no need for an ancient app like JuiceDefender.

Besides, talking about battery life with a new phone (or flashed a new ROM) without using it for over a week is premature. The OS needs about 1 week of time to calibrate and report accurate battery status unless you do a manual battery calibration.