Samsung Galaxy S2 was just recently updated to the 4.1.2 version on Jelly Bean and I can personally say they have pleased a whole lot of users. This update was simply becoming too annoying because everybody was asking everywhere about when it will come. Well, now it finally came and its seems to bring a lot of new features among which is the Galaxy S3 Nature UX user interface completely replacing the previous Galaxy S2 UI.

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But apart from all the new features that the update brings, it seems that the update also brings some issues. For example the battery on the Galaxy S2 running Android 4.1.2 is draining much faster than it would on ICS. Or at least that’s what most of the users that installed the update are saying. Of course, the battery on the Galaxy S2 is not the best one out there, and if you even own the device for a year now it will definitely drain faster. But still, let’s look into this battery draining too fast on the Android 4.1.2 Galaxy S2.

As you know, one of the biggest issue with Samsung phones that are not a Galaxy S3 or Note 2 or similar is the battery. All the exciting features and improvements that the Android operating system is offering are too much for a simple 1600 mAh battery to  handle. So apparently the update Galaxy S2 to Android Jelly Bean is eating a lot of the battery very fast.

Some advice may be given to prevent battery draining too fast, for example turning off Wi-Fi when not using it, turning off location from Settings, disabling all the pre-installed apps and Google apps that you don’t use. But the truth is, the battery in the Galaxy S2 is simply not powerful enough to handle all that Jelly Bean is offering completely. You can indeed win a few extra hours of usage by disabling bloatware and different settings, but that will only take away from you the full Jelly Bean experience. For example Google Now is a very exciting feature and a lot of users enjoy using it, but it seems that it uses very much of the battery. Shutting it down would save some battery life, but it will simply take away a nice feature from you. And what’s the point in wanting updates and new features if you end up disabling all of them eventually?

Have you installed Jelly Bean on your Galaxy S2? How is your battery doing?

And as always, we end with an invite: don't be a stranger and join our community - be a part of the conversation where we help each other out, discuss the latest and greatest, and make the best of our tech.

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  • Federico

    Buongiorno. Confermo quanto scritto nel vostro articolo, ma con un grosso bug in piu’. Difatti la scorsa settimana ho aggiornato il mio Galaxy S2 da Ice Cream Sandwich ad Android Jelly Bean 4.1.2 ufficiale uscito in Spagna, utilizzando Odin. Ebbene l’aggiornamento e’ riuscito alla perfezione, ma dopo una settimana di utilizzo ho notato un notevole aumento nel consumo della batteria anche in standby, ma soprattutto un malfunzionamento del nuovo calendario integrato. Ovvero io per lavoro devo gestire un sacco di appuntamenti ed ho sempre utilizzato Google Calendar su Pc sincronizzato con il calendario Samsung del mio S2. Pero’ dopo l’aggiornamento a Jelly Bean mi sono spariti dal cellulare tutti gli appuntamenti del 2012 e mi sono rimasti solo quelli di Gennaio 2013. Quindi ho provato ad entrare in gestione applicazioni e a cancellare sia i dati del calendario e sia i dati relativi alla memorizzazione del calendario; ho effettuato una nuova sincronizzazione, ma nulla da fare del 2012 nessuna traccia. Invece su Google Calendar nel Pc trovo tutto. Inoltre mi sono accorto che se vado a creare un evento dal Pc, lo trovo subito nel cellulare, ma viceversa se lo creo nel cellulare non lo trovo piu’ sul Pc. Sinceramente questo mi sta creando un notevole disagio. Vi chiedo gentilmente se avete qualche consiglio per risolvere questo problema. Vi ringrazio anticipatamente.

  • Krystian

    I’ve installed JB on my SGS2 and it’s difficult to even call it battery LIFE! I charge my phone over night every night. I unplug it when I leave bed. Before I go out of my apartment it already has around 88% of juice. And.. I’m not using it much apart from reading 2-3 emails. It’s crap. I would advice to wait for another update before flashing your phone.

  • Anup

    The battery Drain is insane!!!! Give it 5 minutes and battery drops 1 to 2 percent with just 3g on and using just Facebook . How the hell is that possible .. i turned on GPS and 3g For google navigator for 10 Minutes and WOOP !! Almost 10 % battery drain before it was just max 5 ..tht too pushing it to the limit.
    HAve to say its really a let down factor !!! i wonder how the new GAlaxy series with similar processor is going to handle the Jellybean ???

    • CliveHargreaves

      I agree. Battery drain ruins phone. Can I roll back to earlier version ??

  • Soli Engineer

    I agree with Krystain, however… what is the solution?
    1. can we at least update the corrected Jelly bean version when Samsung releases it for S2?
    2. is there some remedy for this one as yet? :(
    its impossible to use the phone with this extreme draining of battery. Under the circumstances the phone does everything else like ‘Google now’ and other fancy stuff but does not all us to use the phone for the very purpose it was made for, thats calling ppl ;)

  • Soli Engineer

    have successfully updated however it is going a bit slow. I would like to know if i needed to factory reset and clean partition cache before upgrading?
    i had only done the clean cache partition. Please let me know if i should do now.
    Do i need to do factory rest and clean partation again?
    Do i have to re install the jellybean upgrade again after doing that?
    also the battery is draining v fast. Need to charge 3 times a day, but i have disabled the google now and that has made a bit of a difference still not up to the mark :(

  • Erik

    setting ‘keep wifi on during sleep’ to never already gives a significant increase in battery life (in fact making it easily last a day). This used to be the other way around where ‘always’ was the best setting.

  • Chris

    I agree. JB runs fantastically smoothly and looks great but it is a bit heavy on the battery. With power saving off I’m getting about 5-7 hours which is about 3 hours less than ICS with pretty much the same use and setup.

  • Sandro

    Ho installato l’aggiornamento Galaxy S2 da Ice Cream Sandwich ad Android Jelly Bean 4.1.2 devo dire che all’inizio i primi problemi sono stati vari. Ho dovuto riconfigurare gli account di google e di Samsung perchè gli aggiornamenti non funzionavano e avevo perso tutti gli impegni e molte voci in rubrica,ora il solo e grosso problema io ho una batteria potenziata e devo dire che a volte non riesco a fare sera.
    Mi dispiace molto perchè io lo ritengo un ottimo smartphone,spero che la Samsung corra presto al riparo con una correzione, altrimenti devo cambiare modello e passare al S3 .

  • Michael Hannes

    Battery runs out extremely fast. Seems like i’m only get half the time i had before. Big bummer.

  • Soli Engineer

    are there any fixes for this Jellybean updated?
    is there a safe way to root this version?

  • Peter K

    My Note 10.1 works well with Jelly Bean, but after an upgrade from ICS last week my beloved Galaxy S2 is nowhere near the performance it had. The worst is the battery. I now have to turn off the wifi and miss the hourly email updares – the most important feature in my case. GPS no longer lasts more than half of what it used to. I really wish I could get back to ICS. But I guess that is not possible.

  • lavernne

    my galaxy s2., is still on ICS. I notice a week ago, the battery draining very fast. Even i been full charge, after an hour, the battery percentage is around 80%. Before my phone will last for a day or two. Even i surf the net, plays games and listen to music on speaker phone…What seem to be the problem????

  • Isod

    Hi, there, I had at the begin the same problem, then I install the Nordic Rom “I9100XWLSJ I9100OXXLS7 NEE” with Odin, then I need to do a factory reset, let drain the handy battery 2 – 3 times, now with 3gs it holds 52H, only problem, when I use the WLAN, then It sucks out the battery.

  • vSphere

    I’ve installed various different Jellybean ROMS from official to custom. All of them sucked for battery life. Tried all sorts of kernels, tweaked CPU, but didn’t make much difference, My advice would be to buy a Anker 1900mAh battery to help or downgrade.
    I’ve recently gone back to NeatRoms ICS XWLPY with S3 mods, it looks the same as the stock Jellybean but with the extra battery life. I am now getting 2 days out of my battery with 5hrs display time on couldn’t be happier. Im using a stock battery which is almost 2 years old.

  • PieterDi

    It is really insane. What does it mean if you bring an update of the OS to all S2 users in the world, if you know it is going to drain the S2 battery within 1 day. This smells like Samsung wanting to sell more S3s and soon S4, so the ‘old’ S2’s have to become obsolete as quick as possible.
    My battery usage app tells me it is mostly the screen that consumes the energy, even if the screen has not been on that much. Not possible!
    Samsung, be fair and give a solution here!

  • Tushar Dalela

    I updated my SGS 2 I9100 to Jelly Bean 4.1.2 with high excitement as it offered lots of new features and new UI.
    But this excitment ended after some hours as it drained my battery from 91% to 15% within 2 hours, really surprising !
    Now its battery lasts only for 3-4 hours and while checking the Battery usage I found that Android System is using almost same battery as the Display Screen.
    Even the performance has also effected and it uses appx. 650 MB RAM out of 826 MB even in idle mode, my phone has become slow and it lags while playing modern Games.
    My expensive Samsung’s flagship phone has become practically unusable.
    Samsung should take the matter very seriously and sort the issue with new TESTED update OR the valuable Customers will have to SWITCH FROM SAMSUNG !!

  • CliveHargreaves

    Galaxy Note ruined by battery drain after update. Anyone know how to roll back to earlier operating system ?
    Samsung really letting themselves down with this.

  • CliveHargreaves

    Re. battery drain by new android o.s. I’ve read a few blogs about how to minimize battery drain, but they’re far too geeky. and involved. I just want a phone that works without getting a software degree.

    COME ON SAMSUNG – you are ruining your reputation. Word gets round very quickly !

  • Jason

    SGS2 Battery drain three times fast than ICS when upgraded to JB.
    I removed the Battery App I had installed might help a bit. But still twice as fast battery use. Never using Google Location, WIFI, or GPS services – always off.
    Fix it or you will just lose more customers.

  • cynthia

    Need a quick fix this battery drainage is insane……Battery wont charge at all after a while. When is the fix coming?

  • sohail

    Dear plz just trll me how to fix this fast battery draining on my s2 running on jellybean 4.1.2………or I should downgrade it again to 2.3 gengerbread…..plz help me

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  • gautamsarkar

    Please update my phone

  • gautamsarkar

    Please update my phone my phone is samsung galaxy s2

  • Gautam Sarkar

    Hi samsung please update my phone

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What's my model number?

There are several ways to locate your model number:

Option 1
On your device, go to Settings, then "About device" and scroll down to "Model number"
Option 2
Often times you can view the model number inside the device, by removing the battery
Option 3
Using Samsung's model/serial number location tool