How To Save Battery On Your Samsung Galaxy S2

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June 5, 2011

The Samsung Galaxy S2 is currently the smartphone on top of the throne. It packs a hefty battery that will handle all your needs, but doesn’t mean you can optimize and maximize it’s battery life. Here’s how to do just that with your Galaxy S2′s 1650 mAh battery.

Control your screen brightness

The most battery intensive aspect of the Galaxy S2 would be the awesome Super AMOLED Plus display, although it has been optimized to reduce drain, it still the main source of drain. What you want to do is deactivate the auto-brightness feature in the Settings menu and push the brightness slider right down.

If you want to retain the auto-brightness feature, at least make sure you download the latest Galaxy S2 software update through Kies – it includes a fix that’ll stabilze the auto-adjust effect thus preserving a bit more power

Avoid live background and go simple

As appealing those live wallpapers are, they are not battery friendly and drains a lot of it. It is really unneccessary if you cherish your battery life to last all day.

Stick with a simple static background which will be much less demanding on the battery and still look good, so switch to a darker wallpaper if you really want to save power to avoid rendering vibrant colors.

Kill background/inactive apps with Task Manager

The beauty of an android is its ability to multitask and run numerous apps at the same time. The downside to this is super fast battery drainage and even slowing down the device due to RAM throttling if you get to that point.

So use that handle app that Samsung has included, Task Manager, to kill all those unnecessary apps that are hogging all your RAM and draining your battery life.

The phone can even be configured to take care of some of this automatically through its Power Saving Mode, which can be configured to kick in when your battery drops to a certain percentage.

Limit network access

How your Galaxy S2 connects to networks via Wi-Fi or 3G plays a huge factor in your battery life. The are couple of ways to optimize power here, one being turning off Wi-Fi when not in use.

You could also consider lowering the frequency with which your Galaxy S2 auto-syncs to draw in your email. Furthermore, you could even turn off auto-sync altogether and simply sync manually whenever you need to if you are not expecting anything of importance.

Lastly, if you only need to use your phone for regular voice calls and text messages, consider opting to use ‘GSM only’ in the Network mode menu – this forces your phone to use 2G only rather than switching between 2G and 3G depending on availability.

Learn to charge properly

You might not think there is a proper way to charge your battery to get the most out of it, which is true. There are techniques rather than a proper way, which is really utilize the battery full capacity.

There is no need to always top off the battery to a full charge whenever you get a chance, rather use the battery to its fullest as in draining it from your usage then charging it back up several times. This is more of a maintenance thing for your battery to establish itself sort of and it’ll do better for your Galaxy S2 in the long run.

{ 22 comments… read them below or add one }

User.Inside June 5, 2011 at 1:12 pm

good post

one more trick we can do is about settings network
When I stay inside country , I set to manual network search, instead of automatic
like this, the phone not try to reach another network in places with poor station.


MuteMath Fan June 6, 2011 at 12:43 am

Very helpful tips, thanks for sharing!


orocan June 7, 2011 at 1:08 am

the battery drain is caused by android 2.3.3 bug and not the display, while idle it triggers the cpu in suspend is already raised in google but is still under medium priority:


kris November 24, 2011 at 9:07 am

My galaxy S 2 uses v. 2.3.5


radux42 June 7, 2011 at 9:30 pm

This nearly works for every smartphone… and I can highly recommend it!


didi July 6, 2011 at 11:03 am

Animated wallpaper is draining the battery a lot. After selecting a simple wallpaper the duration for me went from 9h to 1,5 days! It looks like CPU is computing animation all the time even if the phone is locked…


Ravikumjar July 27, 2011 at 6:46 am

Dear friends, 2 days back i bought galaxy s2 i configured 2mails , Battery backup is too worst not even is coming up to 4 hours


Hank Evans August 5, 2011 at 10:30 pm

I’ve had my Galaxy S 2 for just over a week now and must say that I’m impressed with it battery life. I was previously using a Nokia N97 and now my new phone knocks into fits.
Battery life is approximately 24hrs, thats using Youtube, facebook ect plus all the other gizmo’s.
I’ve taken into account about the screen brightness and have adjusted so it’s down quite a bite but still ok on the eyes. Plus I’ve removed the live wallpaper, now going for a static pic.
Finally, I’ve de-selected the bluetooth and wi-fi, I’ll only use these once in a blue moon.
Over all, I’m very pleased, a great little phone.


Kumar August 24, 2011 at 12:09 pm

It looks like Galaxy S2 or Andriod 2.3.3 has problem with E-Mail, i setup my e-mail for company mails, and batter was 100%, and i went to sleep, in 6 hours my phone died because it drained out of battery. I deleted the account and check the battery life, it is normal and ok for a Smart Phone.
so not sure what is the deal…is it Samsung Galaxy S2 issue or Andriod 2.3.3


kris November 24, 2011 at 9:10 am

Why do you people keep writing android v. 2.3.3, when we are talking about galaxy S 2? My phone uses 2.3.5, I bought it this way. I never updated it


igi August 27, 2011 at 9:11 am

i thing battery size compering to iphone are crazy small due by samsung wants make phone thiner and thiner (stupid) and processor dual core may be it is but where is cooling system ? this phone gets extreme hot when is time to use its processors and the speed drops allot


Toflo September 7, 2011 at 11:29 am

I have a different experience. Wifi on i draining my battery much more than anything else. 3G is the second largest battery-consumer.

When I turn Wifi and 3G off, and leave EVERYTHING else on including live wallpapers and maximum light setting it will last 2-3 days. And I make a lot of calls during the day.

With 3G on and Wifi off it will last for 12-15 hours. With wifi on and 3G off it only lasts 5-7 hours.


joe September 9, 2011 at 3:25 pm

All i can say is buy extra battery(s) this phone is a power hog
My battery dies after 6 hours of use there is a problem with this phone hopefully it will be corrected soon


Viknesh September 27, 2011 at 11:48 am

Guys, download Juice Defender from Android market. That appication will solve your battery life span. I’m using a Motorola Milestone XT720. I have 2 batt as it will always drain off very fast. But after installing this application, I would say that my batt last me more than 80% now. Try it and you guys will know the magic.



Karthik October 18, 2011 at 2:44 pm

Hi Guys,

It’s too early for me to say, it’s samsung’s issue or manufacturing defect with the battery of my 10days old samsung galaxy S2 (S II) that I bought from at&t store but for sure it drains atleast 10% of battery power every hour without doing much !! I give you logs of some intersting observation I made last two days…

17th Oct’11:

Time – Batter Percentage
8.30am – 98%
9.18am -72% (from 8.30am to 9.10am , phone was on at&t network, rest all on wifi mostly)
3pm – 36%
4.26pm – 28%
6pm – 8%
7pm – Phone dead
7.30 – On for charging

Observation: Android OS ( under battery usage) showed 55%.

I stopped by at&t store to check with them, store rep. noticed I had done maximum efforts to conserve the battery, said you are not even enjoying the great dsiplay of super AMOLED plus by sessing the brightness to zero! What all I have done to conserve the battery are as follows:

1. I made sure there were no ‘live wallpapers’
2. I removed default widets (factory setup) such as ‘Facebook’ ,’Accuweather’, ‘Google search’
3. I changed the Display brightnighness to dead minimun ( moved the bar left most , settings-> Display->Brightness, uncheck Automatic brightness and move the bar down left)
4. Used to kill all unwated services/Applications using Advanced task killer and Task Manager
5. ‘Clear the memory’ in the ‘RAM’ Tab of Task Manager
6. Unchecked ‘Backgroud data’ and ‘Auto-Sync’ in Accounts and Sync (settings -> Accounts and Sync)
7. Used ‘Power saving mode’ ( this mode turs on when battery reaches down to 30% ) and disable all execpt Wi-Fi.
8. Turned off GPS, Bluetooth
9. Screen timeout 30 seconds

Yestedays, I reset the phone to factory default at 8pm (17th Oct) as per the at&t store rep’s advice.

Here is the today’s batter log:
18th Oct’11:
Time – Batter Percentage
5.30am – 100%
9.34 am – 35% (from 8.30am to 9am , phone was on at&t network, rest all on wifi)
10.33 – 26%
11.33 – 17%
1.15 – Phone dead

Phone details:

Android version: 2.3.4
Kernel Version:
Model number: SAMSUNG-SGH-I777
BAseband version: I777UCKH7

The 10 days old phone is charging now, let me keep my fingers crossed!I will study it two more days or you guys know what I can do!

Please share your experience if you haev trouble with samsung galaxy s2 phone ( at&t) especially with fast battery draining or any other issues. Thanks!


Karthik October 18, 2011 at 3:46 pm

I also wanted to write , the phone heated up a lot ( NOT A LITTLE, A LOT for smart phone, I say) when I played music streaming apps ( Tandora from Market).


Martin October 20, 2011 at 9:01 am

Your last point is a very outdated information that does not apply to the Li-Ion cells used in today’s phones. I guess your wording speaks for itself: “to establish itself sort of”
You are describing a way to reduce the memory effect of NiCd batteries, which none of your readers will have in their phone. Li-Ion batteries instead suffer from the deep discharge you describe. Manufacturers are aware of this and thus prevent it through the built-in charge/discharge regulator. Other than that, it really is of no difference if you recharge twice from 75% or once from 50% discharge.
Varta has put together a pretty good handbook illustrating the background:


Jack January 30, 2012 at 4:37 pm

I just got my Galaxy 2s, i777, from AT&T. I charged the phone completely, and then loaded about 10 apps on it, during a short period of time. The battery lasted FOUR HOURS! I had transferred in from an Apple iPhone, first generation. My battery life on that phone was in terms of DAYS, not HOURS. I understand that the screen is larger on the Galaxy, so more power is used. I understand that using Wi-Fi eats up juice, but come-on, load ten apps and the phone is below 50% in battery power? That seems a little excessive, when AT&T advertised that the phone has an 8 hr. talk time, and 16 DAY standby time. I saw one party that said the phone had GREAT battery life, for lasting 24 hours! Are you kidding me, 24 hours? I have seen commentary from some folks that they use their phone ‘sparingly’, to not reduce their battery life on the S2. What good is a phone if you are essentially afraid to use it, because the battery will die on you. Is this normal for Android phones, and especially this new ‘top-of-the-line’ Galaxy S2 phone. BTW, I have also used the conservative, battery saving items, to reduce drain on the battery, but it still appears that the phone is a power ‘guzzler’. What am I missing here? I am giving it one last chance. I have charged it up fully and I am going to just let it sit, unused, and I will be very interested to see how it matches the description of ‘stand-by’ time, that AT&T states in its’ advertising (up to 16 days). I don’t see the phone making it to this 16 day point, and doubt very seriously that it could even reach the 8 hours of talk time that AT&T states. I would have to ask for my contract to be voided and my old phone reactivated. At least I could depend on my old phone to be ‘alive’ when I needed it, even after playing a lot of games on it, talking, emailing, and texting. As they say, they don’t make things the way they used to!


Sale March 1, 2012 at 8:34 am

*#*#9900#*#* disable fast dormancy
I disabled fast dormancy and my battery lasts definitely longer (around 20-30%).
And further, that fast dormancy was an issue for me when my phone is not used for a longer time, it disconnects from the cell tower to save battery (???), which ended up with me not being available for 8-9 hours (until I realized the phone went “asleep”).

Now it is perfect!


Gandara April 21, 2012 at 12:51 am

Hi! Can I ask what is Fast Dormancy and how does it contributes to the battery life of the S II. Hope you can answer me. Thanks a lot and God bless! :)


Duncan October 25, 2012 at 12:03 pm

I’ve had a Galaxy SII for about a month, having replaced my iphone. Wow, amazed at how quickly the battery drains, even using “power saving” tricks mentioned here and elsewhere.

I may as well have a landline for indoor use, and for the car, a 25 yr old bag phone would be the same, as the phone needs to be plugged in all time.

This phone would be worthless on a camping trip or hike.

Isn’t the whole point of a cell phone to be untethered? Or did I miss something?


Thomas March 4, 2013 at 4:21 pm

i use lithium batteries all day . the battery life is fine . when i have longer and heavier jobs i bought a longer amp hour battery that last twice a s long . like a car or truck,”if you can’t afford the gas ” they make a 3500 amp hour battery for 30.00 dollars . i would research before you buy. call an actual battery shop and determine if it suits your needs. good luck


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