yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy SL i9003] chinmay_7d:
screenshots please....
[AT&T Samsung Galaxy S II SGH-I777] Blaze9:
I don't heavily use my phone, maybe medium usage. However, I usually get over 20 hours of battery life every day, if I don't charge when I hit 20%.

Is this... Normal, or is this... Accurate? I haven't timed the actual hours, only went on the time given by the battery usage app. I -have- calibrated the battery correctly after flashing to CM7.1 nightly (not after each flash, just the first flash).

My old phone (3GS) had about 6-7 hours less, I'm very impressed.
[AT&T Samsung Galaxy S II SGH-I777] WGSXFrank:
I'm experiencing similar battery life ever since installing Cognition + Entropy and using battery calibration. The battery died fairly quick when stock though.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
I admit my usage is pretty light, but 14h to 60% is poor for my usage patterns. :P

However there seems to be a lot of awake/screen-on time for you...

As to battery calibration - doesn't do anything on our phones except possibly make the fuel gauge COMPLETELY wack out, triggering the fuel_alert wakelock bug. (next kernel will fix that bug though - not the root cause of the fuel gauge wacking out but at least the perma-wakelock it causes.)
[AT&T Samsung Galaxy S II SGH-I777] ferrocene:
I'm stock and getting 18 hours of battery, 5.5 hours of screen on time. This its with live wallpapers, Facebook widgets, etc.
[AT&T Samsung Galaxy S II SGH-I777] Blaze9:
I'm on CM7.1 nightlies. They're amazing. I have tasker running, turnning off wifi and bluetooth and 3G/HSPA+ when not in use. But seeing that people are getting similar or better battery usage is crazy. I can't believe it to be honest. When my 3GS was brand new it didn't get close to this.

Very impressed overall.
[AT&T Samsung Galaxy S II SGH-I777] Dranakin:
I'm lucky to get 2 hours of screen time...
[AT&T Samsung Galaxy S II SGH-I777] roadrash7:
Word this phone rocks.
[AT&T Samsung Galaxy S II SGH-I777] pokey9000:
2hr phone call, 5 hours of local mp3 and another 2 of Pandora on 3G, and some gaming and I'm at 41%. My N1 with CM7 would have died long ago.
[AT&T Samsung Galaxy S II SGH-I777] n1nj4dude:
i am getting horrible battery life if the average is 14 hours of moderate use... eitehr that or i am a heavy user and dont realize it
[AT&T Samsung Galaxy S II SGH-I777] trusktr:
Hi, I'm new to XDA...

I have the i777. :D

How can so many hours of battery life be achieved? I have stock everything. Does CM7 really make the batter life last much longer?
[AT&T Samsung Galaxy S II SGH-I777] jm1280:
I was getting terrible battery life using the stock ATT build but since switching to CM7 its been a lot better. Sitting at 13 hrs with 26% left. I am trying to figure out why the Android system for me seems to run really high (70% or more). I have sync turned off, no GPS or BT and only use Wifi when needed. I will say that looking at CPU Spy since moving to CM7 my phone is getting into more Deep Sleep which is good. I notice that Google Maps runs a lot as well as the NFC service. Its confusing because NFC isn't even enabled on the phone? Any ideas to lower Android OS would be appreciated.

Current Stats

13h 58m 22s on battery

Android OS

51%

Display

19%

Android System

9%

Cell Standby

5%

Wifi

4%

Phone Idle

2%
[AT&T Samsung Galaxy S II SGH-I777] trusktr:
Interesting. For me on stock, the Display is always the highest percentage.
[AT&T Samsung Galaxy S II SGH-I777] rogerntami:
"Normal" usage, I get at least 24 hours. Haven't tested it since I rooted it and installed UnNamed ROM yesterday...
[AT&T Samsung Galaxy S II SGH-I777] ferrocene:
are you sure you don't have Android os and display swapped?

Mine is exactly that.
[AT&T Samsung Galaxy S II SGH-I777] tat2messiah:
Im completley stock and average about 17 hours between charges
[AT&T Samsung Galaxy S II SGH-I777] jason.hamilton:
ive noticed really good battery life as well. Running unnamed's most current rom. I went 26 hours a couple days ago and was only down to 30% battery. GPS is off, Wifi is off. Medium usage. I am rather impressed.
[AT&T Samsung Galaxy S II SGH-I777] jm1280:
Those are the correct stats.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
One of the main contributions CM7 has to battery life is plain and simple debloating.

For those that have unexplained drain issues, the following technique is useful:

Install CPUSpy

Get ADB up and running on your PC - for Windows users, Droid Explorer is usually the quickest route

Charge your phone, take it off the charger, reboot (this resets all stats)

Reset CPU timers in CPUSpy (menu->reset timers) - they're often bogus on boot

Let the phone sit for a few hours

Check CPUSpy for deep sleep percentages - when a phone is idle in moderate signal, it should usually be 90-95%. On wifi you can potentially hit 96-97%.

If the deep sleep percentage is very low, collect data using ADB:

adb shell cat /proc/wakelocks > wakelocks.txt

Post wakelocks.txt here for analysis.
[AT&T Samsung Galaxy S II SGH-I777] SpectraDawn:
I got JuiceDefenderUlt and I actually think it's well worth the $. I used it heavily today during for about 5 hours and it didn't dip below 80%, very suprising when bfore JDU it would be at 50-60%. I think I can probably go 2 days without a charge and it might survive.
[AT&T Samsung Galaxy S II SGH-I777] arctia:
Everyone 's definition of "medium" or "high" usage is different. Need to post some display numbers.

I think my best one was 95% battery to below 5%, 4 hours and 30 minutes of screen on time, 16 hours on battery.
[AT&T Samsung Galaxy S II SGH-I777] dlwoodjr:
Me too...

My battery life has been phenominal... I am still 100% stock... I haven't taken the time to even root.

I love this phone more and more... So much better than my wife's iPhone 4S...

13hrs and at 67% charged... I think on the Cappy (before GB) it would be below 20% after 12 hrs...

Don
[AT&T Samsung Galaxy S II SGH-I777] :
Compared to what I used to get on the Thunderbolt, I'm getting amazing battery life. I'm at just over 14 hours on battery and still have 44% remaining. With the TBolt, I was plugging it back in after about six hours.
[AT&T Samsung Galaxy S II SGH-I777] jm1280:
I am wondering if some of these units were defective. My battery life was terrible stock and is much better with CM7 but I'm not getting anywhere near what some people are. Maybe its just the battery. Most time I have gotten on a charge is about 18 hrs, which is pretty good but no where near 14 hrs and still 67% left! Thats just awesome crazy. I am taking Entropy512's suggested steps right now and will go from there. If I'm still not satisfied I'll run the stats from ADB and post up. Maybe its something else.
[AT&T Samsung Galaxy S II SGH-I777] nyamoV2:
mine hasnt been like other either. maybe my idea of use is different to i'm not quite sure. but i do know, i was going for a full charge last night. and it took me almost 90 minutes to kill my battery's last 40%. granted all i was doing was watching a movie from my sd card on full brightness. i think that maybe my phone can last longer than i think under 40%.

when i finally got to 4%, i had around 4 1/2hrs screen time
[AT&T Samsung Galaxy S II SGH-I777] mbze430:
Here is mine from today. I had to plug it in a few times to work on some Dev and testing... but this is WITH Unnamed 1.03 + Entopy latest kernel + JB and undervolting. NO OC
[AT&T Samsung Galaxy S II SGH-I777] tewan:
It seems that the battery life on the phone is a hit or miss for me... some days I'll barely squeeze out 8 hours and other days I get things like this.
[AT&T Samsung Galaxy S II SGH-I777] Alucardis666:
Well most battery life I've seen someone pull is 22Hrs. it was extremely light use with every thing turned off and the phone stayed in deep sleep for a long long time. so I guess the apps are what really kill it. I get on average about 12-14hrs. most I've gotten was 18 least I've gotten was about 6.5-7. The battery is decent, but I HATE how slow it is to charge. my old iphone 4 would go from 10%-100 in about 1.5hrs. this phone takes nearly 4hrs to go to a full charge.

Also note battery life will vary from rom to rom and pending on how your device is used, as well as with what apps are or aren't in use on your device, its about being a smart power user rather than going full blast just cuz you can.
[AT&T Samsung Galaxy S II SGH-I777] link12245:
Yeah, this phone is *****in. Thats just todays usage, and I'm posting this on it right now. I've had better days, but this was a heavier use day. Ah, just hit 10% as I type. My Atrix would have been dead hours ago. Exynox (sp?) processor ftw!
[AT&T Samsung Galaxy S II SGH-I777] jbsg02:
My first full day with my GS2 and could not be happier with battery life. I am coming from an HTC Evo on Sprint. I'm at 15 hours for the day and still have 64% left. This was with a handful of texts, a few phone calls, some game playing (words with friends) and some web browsing. My Evo, in areas with bad signal, would be at 64% after a few hours sitting in my pocket searching for signal. Not only is my battery lasting longer, but my 3G speeds are better and on top of it all, I am paying less now that I'm back on a family plan.
[AT&T Samsung Galaxy S II SGH-I777] cheesekake:
The most life I have been able to last in one charge is roughly 14 hours. That was with very little use, light texting throughout the day. On average, I am lucky to get 10 hours out of the battery. I am trying the Unnamed ROM now with a new kernel to see if that helps improve.

I have used BetterBatteryStats and the Awake time is much higher than my Screen On.

Awake: 55.7%

Screen On: 16.6%

Not sure if that is a bad thing necessarily. I'm trying to find any apps that may be running in the background! Battery is killing me right now!
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Something is wrong - collect debugging data as documented in http://xdaforums.com/showthread.php?t=1308030
[AT&T Samsung Galaxy S II SGH-I777] cheesekake:
Thanks!

Will do, I am heading off to work, I will let the device run all day without plugging in at all and see where the stats come in. I'm at a full charge now, will reset stats and take it from there. I will post the data later this evening in your other thread.

I appreciate it.
[AT&T Samsung Galaxy S II SGH-I777] MWilkenson:
This is using stock with 2 hours display also running juice defender. Moderate usage in my opinion

Edit: 3 hours of display...prob not relevant but wanted to give accurate information ...I also watched one tv show on media hub and listened to music on this charge
[AT&T Samsung Galaxy S II SGH-I777] tboooe:
At idle, I lose 1% battery every 2 hours! Needless to say I am pretty happy but always looking for was to get more life out of the battery.
[AT&T Samsung Galaxy S II SGH-I777] MWilkenson:
I completely agree. This being my first smartphone though I'm extremely impressed..I can't wait till I eventually learn how to root and do all that good stuff to make it last much longer
[AT&T Samsung Galaxy S II SGH-I777] dlwoodjr:
Welcome to the world of smartphones... I will say though that in my experience, the battery life of the SGS2 is far and away better than I am accustomed to... and I am not complaining about that.

Don
[AT&T Samsung Galaxy S II SGH-I777] Blaze9:
I've had my fair share of smart phones. My first being a Treo650, don't even remember the battery life, but remember it needing constant charging. After that I went to a G1, battery was so bad I got one of those HUGE extended batteries, which trippled the size of the phone. Then I moved over to iPhones, first getting the 3G, which had a decent battery life of about 12 hours, and then the 3GS, which had a terrible life of < 8 hours. This phone, being the fastest, most powerful, and best looking, has the best battery to boot.
[AT&T Samsung Galaxy S II SGH-I777] jm1280:
over 1 day on the phone, damn man. Here are my stats so far today...

Just ridiculous. Rooted to CM7 (was worse on stock), sync turned off, BT off, GPS off, Auto Brightness on. Have just texted here and there, checked a few sites and emails. No video at all. Going to try and pull wakelocks from phone tomorrow and post up. I might just take it back and get a new battery or swap out the phone for another one.
[AT&T Samsung Galaxy S II SGH-I777] Pmac25:
Yeah I have great battery life with my phone.

Most days I use the GPS, play music and have Cardio-trainer running for 2+hours, Txt, calls and web all day off and on.

Most nights it is around 65-70% when I plug it in after 14-16 hours off the charger.

Today I was on the road most of the day so I did not use it much but it was at 85% after 12 hours of the charger.
[AT&T Samsung Galaxy S II SGH-I777] Alucardis666:
I think I'm winning...

Still had about 5% to spare....
[AT&T Samsung Galaxy S II SGH-I777] n1nj4dude:
does anybody ACTUALLY even use their phone? everyones screen shots seem to show their phone having been asleep for most of the time... whats the point of having 2 days of battery if its in your pocket for 80-90% of that? i get about 8 hours out of my battery because i have it on and using it. no offense to anyone of course. i just kinda find it silly to cripple your phone of being a phone just so battery charts show 20+ hours, guess thats just me
[AT&T Samsung Galaxy S II SGH-I777] nyamoV2:
mine was good around 20hrs. then went to pot at around 12-13hrs. been tinkering and now i should be good for around 16-20hrs depending on use. the damn network locations kept chewing through my battery with wakelocks all the time, now that its gone, everything is so much better. so it looks like an aveage of about 15hrs right now for me. coming from an inspire thats a huge jump
[AT&T Samsung Galaxy S II SGH-I777] Alucardis666:
Well I did play some games, stream I think 4 youtube vids, played some music and have maybe 45 minutes worth of calls, oh and I sent over 500 txts, and checked my mail... still got over a day and hrs out of it.
[AT&T Samsung Galaxy S II SGH-I777] ferrocene:
Who has time to play with a phone for 8 hours? Is that straight, or do you take lunch breaks?
[AT&T Samsung Galaxy S II SGH-I777] igolfchip:
I too am getting really, really good battery life with my SGS2... this past weekend, I got 1d, 18 hrs with 25% left with average use (less than during workweek but still got plenty of use).

For a while, my battery life was mediocre but took a bunch of steps based on some threads to maximize:

Got rid of apps & activities that unnecessarily wake the device from sleep:

- Running stock ROM, rooted and stripped out all the crappy bloatware that contributes to battery life with Titanium. Esp. emphasis on freezing / uninstalling all the Samsung SNS, widgets, etc... that I don't use.

- Kept widgets to a minimum

- Uninstalled Skype, Words with Friends and others that are notorious partial wake culprits

- still have 2 different exchange accounts on push during week, 30 min refresh on weekends / nights

- I still run TuneIn radio from the car and at the gym (2 hrs+ streaming music a day)

Learned that Android 2.3 has good enough power mgmt features / less is more with the stock rom

- Installed CPU spy and Better Battery Stats; got a good view of any rogue apps in order to either uninstall OR use judiciously.

- UNINSTALLED Juice Defender, Set CPU and Automatic Task killer. Found via CPUSpy stats that they really weren't necessarily and used more power than they saved.

- Only app closing tool I use is the "Force Stop" command in the Battery Stats.

Other tips:

- Wi-Fi radio uses a more power than you'd think. Keep it turned off unless you need it to supplement a lousy 4G signal (lesser of 2 evils)

- GPS and Bluetooth off unless needed. I use a cool app called 'Automatic Bluetooth Toggle' that turns bluetooth on based on rules (when plugged in for me)
[AT&T Samsung Galaxy S II SGH-I777] MWilkenson:
No we all just bought the phone to look at it.
[AT&T Samsung Galaxy S II SGH-I777] tboooe:
LOL! Whats funny is that I barely even use my SGS2 as phone! I make 1-2 calls a day. Most of time its texts, internet, and email. Maybe we should consider calling these devices something other than phones as it seems phone calling is a secondary task for many people.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Pretty good, I disagree on two things:

1) SetCPU is good to have around if you have an undervoltable kernel, also good for having a screen-off profile to keep a rogue app in check and/or tuning the governor to be more aggressively battery-biased when screen-off. However I do wish it would allow governor tuning to be done per-profile...

2) Wifi standby drain is ridiculously low on our device. Wifi data is also FAR more efficient than our cell radio in all circumstances - not just the actual radio power usage, but any background data usage by our radio incurs a minimum 6-second wakelock penalty. As a result, your best battery life in range of a wifi AP will be with wifi sleep policy set to "never". The exception is if you have a rogue app that uses network data only on wifi...
[AT&T Samsung Galaxy S II SGH-I777] krips2003:
I'm getting pretty good battery life on stock.
[AT&T Samsung Galaxy S II SGH-I777] Upsniteflyer:
I installed Serendipity8 on Friday and have almost doubled my battery life to 44 hours. Its been amazing
[AT&T Samsung Galaxy S II SGH-I777] n1nj4dude:
thats great battery life. see thats what i was talking about, its awesome when someone can get the life yours has WHILE being able to actually use it. i just find it funny for those who are trying their hardest to get their phone to last over two days by NOT using it... doesnt make since to me.

college students finished with classes for the day? probably more people than not... i have widgets syncing constantly, syncing between google, texting, surfing the internet, listening to pandora while doing homework, looking at new apps on market, tethering my tablet. yea... whether im directly controlling the screen or not my phone is probably constantly active 8 hours straight. but im not trying to squeeze 3 days into my battery,.. im always near a plug in so i actually use the features my phone has.

like i said im not trying to offend anyone, i just dont see the logic in crippling every feature (syncing, bluetooth, wif etc, -off) just to keep from having to charge it that long. ya know?

cool story, tell it again

nice... thats extremely good especially considering how much your phone shows it was in use, i may switch to that rom, im still stock
[AT&T Samsung Galaxy S II SGH-I777] nh5:
Just got my SGSII last week. Been playing with setCPU, got entropy's kernel running with serendipity 8. Figured out some nice UV settings, then set setCPU to 1Ghz max and 200min, on conservative governor. Phone still lightning fast and its been off the wall for 11 hours with still 60% battery. Had music playing with headphones for about 3 hours today and made about 1:15 minutes of calls. Oh and this was switching between wifi and data most of the day. Always with at least one of them.

Plus when the screen goes off I have a setCPU profile setup to limit it to 500mhz max and 200min also on conservative. That saves battery like the init.d scripts on my captivate did.

Loving the phone so far, just hoping to do a bit more to it as more devs jump in or when I get time to start doing some android mods :)
[AT&T Samsung Galaxy S II SGH-I777] Blaze9:
Man, I'm gonna try out Serendipity 8 ASAP, probably tomorrow night or thursday night. After I'm done with these annoying English and Philosophy papers... And once I'm done playing BF3. haha.
[AT&T Samsung Galaxy S II SGH-I777] sssjk:
I just got the phone on Friday. I plugged it in before going to bed on Friday night and it has not been on the charger since. I'm doing really well. I'm excited b/c I had previous experience with an EVO 4g and I could barely go 10 hrs. I'm completely stock.

Although the red x that shows for battery means its likely about to die on me.
[AT&T Samsung Galaxy S II SGH-I777] MWilkenson:
What steps are you taking to get that kind of usage?? Any apps?
[AT&T Samsung Galaxy S II SGH-I777] vl221:
I can't even squeeze out 12 hours on the stock rom. And that is with light to moderate use with Juice Defender..
[AT&T Samsung Galaxy S II SGH-I777] sweetboy02125:
Serendipity 8 and Unname ROM, which one you guys think can save more battery in your opinion? I think S8 a just bit better or may be the same :)
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Stock ROM has lots of known battery drainers - AP Mobile widget eats battery and data, SNS eats battery, SisoDrmProvider ate battery on the Infuse, it didn't get enough time for me to determine if it did on the GS2.
[AT&T Samsung Galaxy S II SGH-I777] rav4kar:
something sucks battery power

I have the similar problem on stock ROM, even if you keep the phone idle to die down, "android OS" uses at least 50% battery and runs it down completely in 18 hours.

When I checked with local at&t store, they said the phone might be sending some statistics to carrier constantly and some default services might be using CPU mostly, I think that's true.

it drains 5% of battery in an hour even when the phone is idle :mad:

So, 8am - 100 % and 7pm -5% battery on a day I spend 15 mins on voice calls, 3 emails syching every hour and 30 mins on browsing on wifi. GPS, bluetooth always off, display brightness very minimum and auto brightness off.

Something fishy with "Android OS" sucking 40 to 50% battery 2.3.4 version of SGS2 at&t.
[AT&T Samsung Galaxy S II SGH-I777] rlarsen462:
Same problem. Stock ROM, Android OS eating all the battery. I've read all the threads on it, probably just screwed. I can't root due to corporate policy unless I want to stop getting my work email and calendar synched to my device.

Trying to work through it with Betterbatterystats but it's pretty ridiculous right now. At least 2% per hour with every radio off. More like 5% or higher when it's actually functioning.

I have disabled a lot of the automatic synching (which annoys me, but my old Blackberry used to synch everything all the time and would last days, now I have to manually check everything...), we'll see how it goes but it seems clear that something in the stock ROM is ****ed and draining a lot of battery.

One of the threads in the other Galaxy S II forum on XDA suggests that even rooting and flashing a new ROM may not fix the problem, that it's somehow deeper. Great.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
To get AOS usage down, you need to get rid of excessive background data usage.

Skype drives network traffic to the device that wakes it up frequently.

Stock ROMs unfortunately have a bunch of crap like the AP Mobile widget that eats data and battery.

Install CPUSpy

Right after removing the phone from the charger, go into CPUSpy and "reset timers"

Let the phone sit for an hour

Open CPUSpy and check deep sleep percentage.

If it's 95%+ it's excellent

If 90%+ it's OK

If 80%+ it's not so good, but not awful

If it's 50% or below you've got a problem, and it's most likely a rogue app.

Note that with some misconfigured Exchange servers, Exchange is responsible for major battery drain, especially calendar sync.
[AT&T Samsung Galaxy S II SGH-I777] rlarsen462:
Thanks! I'll check that stuff.
[AT&T Samsung Galaxy S II SGH-I777] MWilkenson:
This is tempting me to want to root to get better battery life but I feel I need to read more before I do it since this is my first android phone
[AT&T Samsung Galaxy S II SGH-I777] rlarsen462:
Preliminary results not so good seeing <70% after a couple tests with the CPU spy app. This is during the day where the phone is getting emails and texts occasionally during the test.

During normal use (i.e. idle but with radio on, etc.), should I really see over 90℅ in deep sleep?

The majority on the time not in deep sleep is in 200Mhz for what it's worth. About 25%.
[AT&T Samsung Galaxy S II SGH-I777] Entropy512:
Pull /proc/wakelocks as described in my known battery drainers thread... sounds like something is wakelocking you.

I rarely see less than 90% deep sleep on idle - only in very weak signal (like my desk at work). Remember - you need to reset the timers after unplugging, as attaching a charger holds a wakelock.
[AT&T Samsung Galaxy S II SGH-I777] PeartFan40:
Downloading Juice Defender mow.