yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] ithehappy:
Before going to sleep do these things,

A- Check if 'Auto Sync' is running, Disable it if it was. Same goes for Background Data, Disable it.

B- Go to Task Manager and see if any Apps are running. Close it if some were.

C- In Task Manager, go to RAM tab, Press Clear Memory, it should close the hidden apps were running. ***DO NOT do this if you have some kind of Scheduler application running, it will NOT work then***

D- Download an app like Auto Task Killer.

E- If possible keep the 'Power Saving Feature' on with your desired settings.

Do these first, if not worked, do a Hard reset. For me, it decreases about 5-6% battery (max) in overnight period of 8-9 hours.

Regards.
[Galaxy S II General] greyhulk:
I'm not sure what you mean by "battery backup". Are you referring to standby time? Yes, the iphone does better in that department, but that's not typical daily use. Phones are meant to be used, not sit around for days at a time. Iphone can do this because it doesn't truly multitask and no data is syncing. Either you have a faulty device, bad Rom, or your expectations are unrealistic .
[Galaxy S II General] ithehappy:
By Battery Backup I meant Battery Backup. How long your device serves you after a Full charge, that's what Battery Backup means. We all know that a Phone is not for sitting around, Thank You.

I don't have a Faulty device, neither a bad ROM, nor my expectations are unrealistic. How do you know about MY expectations anyway?
[Galaxy S II General] greyhulk:
Actually, since I work in the I.T. field, I do know what battery backup means. It is generally defined as a reserve power source, such as a UPS (Uninterruptible Power Supply) or a watch battery that is installed in a solar calculator. You seem to be confused on terminology. You are almost certainly referring to standby time, which is a statistic that is actually attributed to smartphones and graded in reviews.

As for your expectations, it would seem that you have never owned an Android device before. There has never been an Android phone that has stellar battery life. They have been getting better over the years, but none of them can sit for days on end without dying. With use, they die faster. This is reality. It has been steadily getting better, thanks to hardware improvements (power-sipping processors and screens) and software tweaks (gingerbread), but the SG2 is still prone to all of the same battery consumption issues that every other Android device has. At best, it is slightly better than some and slightly worse than others.

If you want to experience horrible battery life on an Android device, perhaps you should test drive an HTC Thunderbolt. If you want to see slightly better, then perhaps you should try an Atrix.

Otherwise, you should consider the possibility that it is your ROM or device, as that is certainly a possibility. The first Atrix I had was burning through 10% battery every 30 minutes. I swapped it out and the second one was fine. I don't know what firmware you're on, but I do know that my device gets me comfortably through a day and that is normal for a high-end Android device, as well as an iPhone and even a Windows Phone 7 device. I know this because I have owned all of them and many different android devices.

Try to look past your own personal bias and bad experiences and read a few reviews and you'll see that some reviewers say that battery life is great and others say it is not. That's a pretty good indication that there are either differences in hardware or software from one device to the next.
[Galaxy S II General] ithehappy:
All I can say that I am NOT referring to Standby time.

Read some earlier posts and you will get the idea that what actually we are talking about here.

Regards.
[Galaxy S II General] Anarchist310000:
WOW. I went back to stock KE7 and did exactly what you recommended. It's been almost a hour and a half and i having been watching youtube videos through the browser and im now at 96% with almost constant usage, i mean screen has been off for like a total of 10 minutes. This is by far the best my battery has ever performed. This is how i wanted it to be since day one. THANK YOU!

Screen on time has been 1hr 23mins and 34s taking up 38% of battery with Internet second with 32%

I will be re-adding my apps one at a time and monitoring progress
[Galaxy S II General] greyhulk:
What?! You mean it was the ROM you were using? Imagine that!;)
[Galaxy S II General] blunted09:
using litepro 1.4 with wifi sharing frozen, bt on, wifi off, 3g on, display on roughly 80% brightness as of 6:45AM till 3:26PM and i still have 59% battery. Talk time = 40 mins. youtube = 22 minutes. internet browsing = everyhour. Mail = once per hour.

One thing people often overlook is their beautifull widgets and genie widget. I have mine to update every 4 hours for BW and manual updates for genie widget.

Coming from an atrix which has excellent battery, this phone isnt too far off.

I cant complain after about 9 hours of use.
[Galaxy S II General] ithehappy:
You forgot to say that you are charging the device and using it, right?

96% after 90 mins of Ytube?:eek: How on earth is that possible? Must be something wrong.
[Galaxy S II General] greyhulk:
80% brightness! Dude, I run at like 30. Good for you!
[Galaxy S II General] dang2327:
I have been charging these smart phones (Vibrant, for ex) everyday anyway. There probably won't be many on market right now that can last more than a day. So, my suggestions are to turn off 4G, 3G, wifi, and GPS when you don't absolutely need them.
[Galaxy S II General] da13:
With very heavy usage I can get a full day of use. If I tweak my power profiles a bit (disable email sync during office hours and night) and low usage, I get 4-5days battery life. It's actually much better then I expected. I can't say a bad word about battery.
[Galaxy S II General] makaka11:
I was getting the same 10% drain with stock firmware , later i updated to lighty rom v1.3 same remain .

Now with 1.4v i can leave my phone of charger for the hole night to wake up with 4-7% battery drain ( lol i sleep from 6 to 8 h :D) .

It still not as good as the result i had with galaxy s1 but definitively better than a ridiculous 10% per hour
[Galaxy S II General] Anarchist310000:
honestly idk cuz now after almost a full day im at 72% and believe me ive been using it alot. I havent downloaded any apps yet and i have sync'ed my gmail account only and im constantly killing tasks with the task killer before i put the phone to sleep. If something is wrong i don;t mind it one bit cuz this is a problem i like :D:D
[Galaxy S II General] kreoXDA:
If you read carefully, Anarchist (who took my advice on power management in this thread ;)) says the phone is off the charger for 90 minutes, being used for most of that time, around 90-10=80 minutes. The 80 minute usage included some browsing and youtubing. 96% of battery remaining under those exact conditions is theoretically achievable.
[Galaxy S II General] Sleepycat3:
That means nothing. The longer your phone display is off and the less power the other apps use, then Android OS will always take up more % of battery power since the sum of all percentages equals 100%. Think of Android OS as your fixed overheads which you can't avoid. If you fully charge a phone and leave it on standby all the way til the battery was flat, then Android OS would take at least 80-90% of battery. It is just because the other components use less when the phone is on standby.
[Galaxy S II General] Sleepycat3:
Unless he checks the time that the display was on, I find it hard to believe that the phone was actively used for 80 minutes. It is easy to check. Just click on Display under battery usage and it tells you how many minutes the screen was on. That equates to the total time when you are actively using the phone unless the phone was in your pocket and something kept hitting the home or power button which turned the screen on.

For example, here is mine for today. I currently have my phone on for 5 hours and 53 minutes (353 minutes). I have 78% battery remaining which means I used 22%. Out of that 22%, 18% was used for the display. So as an absolute figure, my display had used 3.96% of total the total battery. Then going into the display usage, the uptime was listed as 42 minutes. Hence, for every hour that my display is on, it consumes 5.66% of battery power. So if both our phones were the same, then 80 minutes of usage would use 7.54% of battery. So the absolute best is 92.46% remaining after 90 minutes and this is assuming every other component is not consuming ANY power at all! So it is not possible. His actual usage time would have to be under 80 minutes.
[Galaxy S II General] krabman:
Not buying it either, youtube for 90 minutes and you aint going to have 96% of your battery left. Not a chance in hell this is true.
[Galaxy S II General] Anarchist310000:
well i forgot this is the internet for a second and in my excitement i forgot to take a screenshot and post proof of my now amazing battery life (hope it stays this way). But yes u are right the usage was under 80 minutes but not by much, most of the times I post are approximations. I fully charged my phone. did some browsing and watched youtube videos. After approximately 1hr and 30mins i still had 96% battery. For the 90 mins i did nothing but use the phone so i know my screen of time was very very low but it was probably more than 10 minutes but not much more, I had an almost complete solid screen on and awake bar in the battery stats.
[Galaxy S II General] kreoXDA:
Not buying what? Did you read his post or my explanation of his post? Nowhere did he claim he used youtube for 90 minutes. You guys are unbelievable :)

First of all , thanks for the math and the facts, we need more people like you. :)

Now, to the facts you presented. I followed you till 5.66%. But you can't really interpolate that number to his 80 minutes, can you? You do not actually know what exactly he was doing in his 80 minutes of screen time, and you did not mention what you were doing in your 42 minutes. For example, when I play RoboDefense for a half hour on 80% brightness (screen obviously on for half hour), I get a HUGE drop in my battery charge. When I use my screen in bed at night at minimal brightness, reading a Nook book in gray font on black background, I lose practically nothing in comparison. Did I explain my point?

I still believe that guy , although it is possible he exaggerated a bit, out of excitement. I think I can make my SGS2 lose less than 10% of juice with screen on for 80 minutes. ;)
[Galaxy S II General] krabman:
Nope, I would bet money if you do nothing but keep your screen alive for what is now 80 minutes you will not have 96% left. I'm sorry man but not happening.
[Galaxy S II General] kreoXDA:
I will eat my virtual hat tomorrow, if I am unable to reproduce this. Deal? :)

I will charge overnight, unplug in the morning, and then have the screen on for 80 minutes, and then post a screenshot of "Battery Use" here. That is unless I never post again under this SN ;)
[Galaxy S II General] krabman:
Fair enough. I have seen your posts and you're a good poster so I'll take you at your word. Here is the deal. You must use a a typical payload of apps. In other words most people have email, push or not, weather, etc, going on. You need to keep those running. The screen must either be in auto dim or a setting on the slider that is reasonable. I just had my sister here and she said she could live with a setting about mid way. Either works but fully dimmed I believe is below what most people would find acceptable and a test that doesn't prove out the usage real world is meaningless. No pulling all your widgets, if you don't use any the test isn't valid in the first place because most people do. Your screens must be fully populated as most people have them that way. Basically proving that you can get "X" battery life on a phone that is crippled and not set up the way people use them= not a legitimate proof that this is possible and your phone needs to be setup in a typical fashion. You do this and I will apologize to both of you. That apology will be sincere. I will learn from your example. Deal?
[Galaxy S II General] kreoXDA:
Oh come on, you do not have to apologize, we are all just trying to arrive at the ultimate truth.

I have a few more comments to make in reference to your post:

1) You can't say "half way dimmed screen is comfortable". Minimal brightness is too bright for me when I am in bed at night. Maximum brightness is not enough when I am on a beach.

2) My whole point before was you can ideally achieve 80 minutes screen-on time and lose just 8% of juice. If you can, even under lightest conditions, then you cannot say that guy lied or misinformed you, because you were not behind his shoulder for 80 minutes, watching, and you do not know what he was doing exactly for 80 minutes.

3) "Under normal use" - I would not even bother taking sides, because "normal" is in the eye of the beholder. I have 2 Gmail accounts, 3 yahoo accounts, 1 FB account, 1 Exchange, one weather widget, one calendar widget, 2 pulse widgets, and 4 half-screen picture widgets. I play heavy gaming that heat up the phone for an hour-two, I browse the internet for an hour, and I manage to get through 16 or more hours, which is enough for me. If one day I do not play my games and do not browse the net, and receive an unusually small amount of mail, I get through a full 24 hour day or longer. I posted a number of screenshots on this forum and other sites proving that. My top screen-on time (with a screenshot proof) was 5h+. See this post I made today, with the screen shots. You will have to trust me on my word that they are made at the same time.

To summarize, I will never claim 80 minutes of screen use at 8% drainage under my normal use or the normal use you described is achievable. I believe the guy who claimed that was using his phone under much lighter conditions (if you follow the history of his posts you will see that, he is trying to find what app is causing the drainage, by installing them slowly one by one)

I want to do my test (light usage) just because I want a proof myself that 80 minutes on 8% power is achievable.

Peace! :)
[Galaxy S II General] krabman:
Well actually I can because neither extreme represents typical usage. Few people fire up their phone when they go to bed and then run the screen at minimum and then turn them off when they go nighty night. Nor do most people spend all their time on the beach and have it at maximum. These numbers are available and most people spend most of their time looking at their phone indoors under incandescent light. Nor was 8 percent mentioned. Were talking 4 percent. As to use, take your choice, do anything you want for 80 minutes on this phone. You will not have 96% left.

I do believe it is fair to expect that these numbers represent some kind of real usage. You do not estimate miles per gallon on a car that is running in the garage but otherwise doing nothing. That would have nothing to do with what you are would actually get driving it in any fashion. I'm bringing up this example because I once watched a video of a car going through its epa test loop and I can tell you that virtually no one on the planet drives their car that way and it does not represent what people are actually going to see when they drive another example of that same car.
[Galaxy S II General] rohitgarewal:
Are you using a custom rom when you easy you lose about 1-2% per hour on idle?
[Galaxy S II General] Sleepycat3:
You are right that the brightness and colours displayed will affect the battery usage of the display. But in his case, he has confirmed video playback, which consumes more than displaying text on a dark background. And in my case, my usage was a combination of web browsing and youtube playback so our usage should be comparable. I use 8% brightness which is close to the minimum and if he used anything between 8 to 100% brightness, his display should use more battery than mine, which is the opposite with his super low battery usage.

And yes you can extrapolate to 80 minutes as long as the activity and brightness are comparable and you are looking for a particular trend (i.e. his display should consume the same or more than mine under similar or brighter display settings). In other words I am looking for Display consumption > X and not a value of Display consumption = X. Since his result is currently Display consumption < X, then I can state that something is different in our two displays where he has abnormally low consumption.
[Galaxy S II General] Sleepycat3:
Please don't take offense on us questioning you. It is only because you seem to have stumbled upon the holy grail of extending the SGSII's battery life and as you know everyone is always skeptical when it comes to miracles! We really wish that your result is really true and once you show us that it is real, we will surely be flooding you with requests on how you did it and we will be mentioning your name here for a long time as the person who beat the SGSII's display battery drain.
[Galaxy S II General] zkyevolved:
I don't understand then. What are you killing? The calendar and phonebook app? If you don't have any apps then what are you killing!?
[Galaxy S II General] ithehappy:
I can bet everything I've that after 90 mins of Youtube Video, and that's what OP said, he got left with 96% battery. Even a new born won't believe that. And besides all this talking, why not post a screenshot of 90 mins Display On time with 96% battery in Status Bar?
[Galaxy S II General] kreoXDA:
Third time is a charm. OP did not claim he watched youtube for 90 minutes.
[Galaxy S II General] kreoXDA:
Looks like I will have to chew on my virtual hat but spit it out. Because I didn't manage to prove anyone's point reliably. I had a tough start of the day so I could not do the test like I wanted. The phone was under moderate use, about 20 min of youtube viewing in the browser, rest is emails and some internet browsing and news reading. All on lowest brightness! See screen shots. I will try to do another test tomorrow.

EDIT: The battery remaining was 78% when these screenshots were grabbed.

EDIT: Now it is 75%, tapatalk and my slowness ate 3% :) Time on Batt 5:04, Screen on time 2:20
[Galaxy S II General] troffers:
Your numbers seem quite impressive. I'd be interested to see you OS usage from that test.

I generally get good battery - easily lasting a day or 2. Today, for example, I am at 9hr 20min on battery, 1hr 5min display @ 27% (O% brightness) but Android OS is 30% and Android System is 18%. Current battery level @ 79%.

Now I know 2.3.4 should fix the OS bug, which for me is random, but surely if the phone has been sitting idle for most of the time - 8hrs or so, then Phone Idle should be near the top of the battery usage chart, not the OS. I have Tasker sorting my data use so that comes on and off for 5 minutes every hour, and that only equates to 2% of my battery use.

Running stock KE7 with Go Launcher
[Galaxy S II General] kreoXDA:
My Android OS is 42% and Android System is 9%, but that is NOW, 50 minutes after I snapped those shots.
[Galaxy S II General] Anarchist310000:
I blame none of you for being sceptical because it is unbelievable and I must look like a liar but I swear that I'm telling the truth. That is what I got and right now I am actually very happy with my battery life
[Galaxy S II General] ithehappy:
Guys to all of ya who are getting brilliant battery back up, Please post a Screenshot of your usage duration with Screen On time. It's very east to post a screen, so don't forget it.
[Galaxy S II General] varunkumars:
I agree. I am always on 70% brightness. I listen to music, play cricket, browse, my gmail is always on and gchat also. With a full charge i get it from morning 8:30 to evening 8:30 with 10% of the charge left. It is same like my captivate before.

Only thing that bothers me is the music player. With supercurio fix my captivate was the best music player but now huuuhhh. I don't know if this can be fixed. I am sure it is some codec issue. I hope samsung would fix it by 2.3.4 atleast.
[Galaxy S II General] kreoXDA:
Only the OP is suggesting his batt life is "brilliant" (in your words) after he followed my advice. But he is still gradually rolling out his apps.

I only claimed that my batt life was satisfactory for me. Batt life is like money, you can never have enough of it.
[Galaxy S II General] Anarchist310000:
Playing cricket???? u have a cricket game on your phone? Please share
[Galaxy S II General] kreoXDA:
I think the Indian variant of SGS2 comes with Cricket in the ROM. jk ;)
[Galaxy S II General] krabman:
I have no problem with battery myself and get through the day at 30 to 40 percent. The thing is saying you were actively using the phone for 80 minutes of onscreen time for a total of only 4% bat drain is completely unrealistic. Will not happen, cannot happen on this phone. People read these things though and think that there is something wrong with their phones because they do not get such battery life themselves.

Extrapolate this out, you are talking about 1% for every 20 minutes of on screen time with whatever the activity was. This drain would give you over 16 hours of on screen time at whatever activity with HALF of the battery still remaing. Your talking about continuosly using your phone from 8AM to midnight non stop and still being at 50% battery. This is not even close to realistic and can not and did not happen.
[Galaxy S II General] ithehappy:
I only asked/requested everyone, who claims his/her battery life is great, please DO SHARE THE SCREEN SHOT OF YOUR DISPLAY ON time, is it so hard to understand?

I've NO intention to hurt someone here, neither to make someone a liar, it's just a request and I think it's fair enough for judging and comparing the battery life's of different GS II's.

And the same request also stands for them who are claiming that his/her GS II runs out in 6-7 hours.

Regards.
[Galaxy S II General] Sleepycat3:
That is very good consumption. Calculating based on the screencaps, and that usage pattern, your screen consumes 3.70% per hour. Almost 35% less than my screen which used 5.66% per hour!
[Galaxy S II General] Sleepycat3:
Just did some 100% forum browsing and have my usage figures here.

Pure browsing with my screen on constantly and it still works out to be 5.80% per hour for thee screen. You must have a freakishly frugal screen! It is not unheard of for screens to have different power consumption but I never thought it would be by this much!
[Galaxy S II General] kreoXDA:
Well I'm sorry, I might have visited darker sites, and stayed on the same pages longer. Most of my usage was emailing, and I have black backgrounds in there. The videos I watched were also darkish.

For tomorrow's test I'm planning to simplify things a bit. I will switch off sync and background data so no emails or widgets use the battery, I will then set screen timeout to max, brightness to min, and will be displaying the attached gray image constantly, full-screen. These conditions can be easily reproduced by whoever wants to compare their phones.
[Galaxy S II General] Sleepycat3:
Just have your phone fully charged by tomorrow morning, browse the xda forums for half an hour with the screen set to 8% and see what consumption you get. No need to go through so much effort with disabling sync and all that. Sync battery usage will fall under a different section, probably Android OS or Android system so it won't really affect the display consumption.
[Galaxy S II General] kreoXDA:
I think I have explained my position on this before: "browse the XDA forums for half hour" is not a definitive thing, I can navigate to one post and read it for half hour, or I can go through 60 long threads in that half hour and view 30 attachments. Also, 8% brightness - how do you set it at precisely 8%?