Galaxy S II

How to Increase Samsung Galaxy S2 I9100 Battery Life

Battery Maintenance:

For an increased longevity of battery life it’s very important to ensure that battery is maintained which can be done by following the below steps,

  • Clean the battery contacts which are generally in the Golden in colour with a piece of dry cloth in every 3-4 months of time period,
  • Ensure that you don’t pull out the battery more often as this will spoil the battery contacts as this makes the battery contacts loosen up.
  • Never put battery in extreme temperatures like in extreme cold or in extreme hot like in sunlight or other places as this will spoil the battery immediately.
  • Never place anything above or below the battery shelf in the phone as many times we tend to place an extra sim card below the battery or above, by doing this the battery may get spoiled and may also result in battery bulging which is very dangerous.
  • Unless and until the battery charge prompts you for the low battery it’s not recommended to put your phone for charging as since every battery can be charged only for a particular number of times like say only for 1000 cycles or times after which the battery will have to be replaced, so charge it wisely so that you can save on the new battery purchase.
  • Never charge your phone with the USB when the charge is below 20% or less as basically USB charging employs trickle charging concept which is not good for battery especially when the battery charge is less than 20%, always make use of AC Power chargers to charge your phone.

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  1. maurice

    May 7, 2012 at 5:28 pm

    my battery life last for only one day is it ok ??

    • Ntisekar

      June 13, 2012 at 8:01 pm

      Yes, thts best as most users get no more than 15 hrs

  2. dyperwhiper

    May 6, 2012 at 4:37 pm

    If you really want to increase your battery life you can always buy the larger battery off play or amazon for about £30. I have this and if I fully charge my phone I can easily play apps all day! If i just use it for texts and calls your talking about 48 hours of battery!

  3. Joe

    October 15, 2011 at 11:18 pm

    the first day i got the S2 i had some battery issues. I even had it charging and i was loosing battery life faster than it could charge according to the battery widget.. though i think its full of crap sometimes. I turned off some features like GPS and blue tooth, set to a darker back ground, exited apps when finished and my problems vanished.

    Get the power saver app, i don’t know what its called but something like Power savings, also Program monitor. turn off functions your not using on the fly. use program monitor to kill apps that don’t shut down when you back out of them (and your finished with them) and it will help tremendously. It only takes a second or two to do this and its worth it for battery savings. Just don’t forget to turn WiFi back on when in range to save your data usage!

  4. kala kutta

    September 22, 2011 at 2:16 pm

    Samsung galaxy s 2. i was soo curious to have it, but since the day i have it, it sucked !

    Extremly poor battery life !


    SOME FRINGE on the left hand of screen, you will notice it when u will lower the brightness..

  5. Martin B

    September 12, 2011 at 10:02 am

    my samung s 11 has all 5 app s pages filled up
    can i ad more or is full full


  6. PenGun

    September 12, 2011 at 8:23 am

    After using mine for a while I can say running the battery down and recharging has made mine do about 3 days with just phone and a bit of web.

  7. Markus

    September 5, 2011 at 11:41 am

    The galaxy S2 is quite harsh on the battery by default. You need to optimize it to last. Here is some more tips to make it last approx 3 days:

  8. Rolandas

    September 2, 2011 at 8:01 am

    Im reading and seems nice advises…. but when I comments read about GPS… I suddenly doubted about authors competence. GPS does not need to be turned off. In fact its better to keep it on. Unless you are really freaking about about security and stuff. That some app might use it inappropriately… For everyone’s information GPS does not consume more battery then when it is on. unless some app is using it. and then it will be using it then you will clearly see GPS icon in notification bar…

  9. hkb

    August 25, 2011 at 8:26 am

    just bought the sgs2, and i did notice my battery going down quite fast. After googling it, i came to this post, and aftr reading this i m kinda regretting my sgs2.

    The salesman said that this gives a long battery life….and so did many onlin sources… :s

    Anywy, Will try juice defender.

    And thx for the tips.
    Suscribd in greader. 🙂

    • hkb

      August 25, 2011 at 8:28 am

      all the commens explain how a battery works, but not how to ssave it…..

  10. B

    August 13, 2011 at 5:35 pm

    Thanks mate, cheers.


  11. B

    August 13, 2011 at 4:09 am

    G Money & Ross are absolutely correct. The ‘Memory Effect’ is a phenomena exihibited primarily in NiCad & to a lesser extent, NiMh batteries. The proper term to use is ‘Crystalline Formation’. Quote from

    “Crystalline formation occurs if a nickel-based battery is left in the charger for days or repeatedly recharged without a periodic full discharge. Since most applications fall into this user pattern, NiCd requires a periodic discharge to one volt per cell to prolong service life. A discharge/charge cycle as part of maintenance, known as exercise, should be done every one to three months.Avoid over-exercising as this wears down the battery unnecessarily.”

    Now we see that Memory Effect is repeated LACK of deep discharging, causing crystalline formation in a nickel based cell.
    Li-ion & Li-po’s do not suffer from this effect, in fact they suffer from quite the opposite, as Ross posited above. Quote from batteryuniversity regarding lithium based batteries:

    “Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The smaller the depth of discharge, the longer the battery will last. If at all possible, avoid frequent full discharges and charge more often between uses. If full discharges cannot be avoided, try utilizing a larger battery. Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles other than to calibrate the fuel gauge on a smart battery.”

    So we can see that with nickel based batteries, full, deep discharges are GOOD, and with Lithium based batteries, full deep discharges are BAD. Feel free to visit to learn more.

    • NeaL Pradeep

      August 13, 2011 at 11:05 am

      thanks for your comment and clearing the concept and also for adding your inputs!

    • Tbone

      August 18, 2011 at 2:05 pm

      To clarify the DoD is more a functionary of voltage vs use of total capacity. Provided you do not exceed a safe minimum voltage (such as 3.9v per cell) then you are not stressing a battery very much. Furthermore the draw from a device such as a smartphone is not extreme in terms of (mA) draw. The phone will prevent a minimum voltage from being exceeded. A cell will have a long life provided this is observed regardless how deep into the mAh rating of the battery. once below 3.2 v per cell for instance the lifespan will be drastically effected if not damaged to a point where no recover is possible.

      You can Drain a high-capacity lipo battery to a safe voltage cutoff drawing more than a 100amps from full capacity to low voltage and do this hundreds of time. Lipos shelf life is best when stored at a 50% charge. The entire key to health of a lipo/lion battery is how conservative you are with the voltage cutoff. Of course using a safe cutoff means not all available mAh will be used….but that’s the trade off. Lion will maintain voltage under load until empty at which point a cell crashes. Clearly this doesn’t happen in a phone.

      Hope this helps

      • Tbone

        August 18, 2011 at 2:07 pm

        To clarify, the example of high load high draw lipo battery was referring to a hobby grade battery (as an example of extreme cases of performance with this battery chemistry

  12. pk88123

    August 11, 2011 at 10:01 pm

    @ Duddles

    No you are wrong duddles… lol
    JK you are not wrong but everyone else is just trying to prove their opinion. 😛

  13. Shekar

    August 3, 2011 at 10:29 am

    Also, the Juice Defender app does come in handy conserving the battery life..

  14. Naco

    July 25, 2011 at 11:35 pm

    Your statement about the Li-Ion batteries is ABSOLUTELY false and misleading. Most today’s Li-Ion batteries come with an integrated chip which prevents overcharging, furthermore the Li-Ion batteries do NOT suffer from what is known as “memory’ effect.

    • G-Money

      August 3, 2011 at 11:13 pm


      You are completely wrong. The above person is not talking about overcharging a lipo battery NOR is he talking about memory effect. You missed what was said completely and utterly. You failed Naco.

      • Duddled

        August 4, 2011 at 8:58 pm

        No you are wrong G-Money what on earth do you think memory effect is?

        LiPos DO NOT suffer any issues with depth of discharge, if anything it is beneficial to completely drain the battery from time to time.

        • G-Money

          August 16, 2011 at 10:57 am

          You are incorrect Duddled. Please do some reading about batteries before you post.

          Memory affect applies to Nicad batteries and is a condition where if you only discharge a Nicad battery half way and then continue to do this without running the Nicad battery all the way down, it will lose overall capacity.

          Depth of discharge applies to lipo batteries and means that if you discharge the battery all way, as stated above, you will lose discharge cycles on the batteries.

          Two completely different thing where memory affect applies to overall capacity and depth of dischareg ultimately applies to the amount of charge cycles one can get out of a lipo.

          Nice try but you fell short.

        • Tbone

          August 18, 2011 at 1:50 pm

          You guys are all wrong.

          A) the battery/phone has a chip that prevents the batter from dropping below a certain voltage per lion/lipo cell. Say in this case 3.9v to be safe. The power is cut off at that voltage to protect the battery,

          B) These batteries NEED to be cycled from full charge to full discharge to work at full potential. After a couple cycles the battery will settle out. Running your phone to 0% is not the same as running the battery to 0%. The circuitry will protect the cell by maintaining the correct minimum voltage. Provided that voltage threshold is not exceeded (and it won’t as the phone won’t let you) the battery will remain in fantastic health for a very very long time.

          The batteries job is to protect itself. Your crazy to think manufacturers would leave this job to the consumer when it’s so easily and economically handled onboard the chip.


        • ron

          August 24, 2011 at 2:01 pm

          full charge to full discharge one time one month ok, everyday you are a fool. Only ask a rc hobbist they know a lot of li ion, li poly life nimh nicd etc,

  15. clavicle

    June 28, 2011 at 4:42 pm

    Moral of the story, you buy a premium phone and don’t use its features! lol!

    I do sail on the same boat and often keeping a solar charger along.

    • Neal Pradeep

      June 30, 2011 at 3:26 am

      manufacturer has to understand that when you give so many features and if you want user to try all of them then battery needs to be equally powerful!

  16. M Vlasic

    June 17, 2011 at 4:43 am

    Great advice… Thanks

  17. Ross

    June 14, 2011 at 1:23 am

    Ok, I’ll buy the wallpaper… brightness… and even the 2G when on Wi-Fi (but that’s really nit-picking).

    However, for waiting until you get the low-battery signal before you recharge, absolutely Fail! Li-Ion batteries in particular, are very sensitive to “depth-of-discharge” and will get much more life out of them if you only go down to about 50% discharge state, before charging. Especially damaging, is taking it to the limit of discharge, say about 5% or so remaining… as that eliminates several complete cycles off the battery.

    For best usage on all types of batteries… many sources out there, but batteryuniverisity covers it very well, and explains chemistry for almost everyone to understand.

    • Chris

      August 6, 2011 at 11:37 pm

      Li-ion batteries do not get damaged by letting them discharge. They have no memory effect either.
      I am an engineer so I know!

      • ron

        August 24, 2011 at 1:52 pm

        A partial discharge reduces stress and prolongs battery life:
        if you discharge 100% 500 cycles, discharge 50% 1500 cycles
        Li ion dont use trickle charging.

      • sd

        September 25, 2011 at 7:39 pm

        man galaxy s2 battry life sucks to the core its so fucken loowww but the functions are just awesome

      • maria

        April 25, 2012 at 12:10 am

        Battery life on samsung s ii is crap, doesnt even last a day

      • Deb

        May 23, 2012 at 10:25 pm

        I agree with you, I have been told by many techs that letting your battery fully drain before charging it (including cordless phones) helps prlong the life of the battery.

  18. Sudersan, Coimbatore

    June 13, 2011 at 8:38 am

    Really helpful. Thanks very much.

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