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Old December 23rd, 2011, 11:51 AM   #1 (permalink)
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Default 2.3.6 Battery life sucks

Before 2.3.6
100% at 7am when I pull it off the charger
64% at 6:30pm when I get home
45% at 11:30pm
No charging

After 2.3.6
100% at 7am when I pull it off the charger
60% at 12:30

Anyone else?
I am not using the phone any more than usual, in order to verify this I left my phone sitting on my desk when I got to the office this morning and didn't touch it until noon, I get roughly the same amount of email traffic and I have been using a laptop all day so I haven't touched my phone at all.

This phone just went from a nightly charger to topping off twice a day.

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Old December 23rd, 2011, 12:20 PM   #2 (permalink)
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I agree. My battery life is noticeably worse after the "upgrade."
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Old December 23rd, 2011, 12:35 PM   #3 (permalink)
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Glad I didn't upgrade yet then. I have no issues with 2.3.4. I also heard that superoneclick doesn't work with the S2 running 2.3.6, and that the upgrade takes away root.
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Old December 23rd, 2011, 02:12 PM   #4 (permalink)
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Yeah, after the update my battery life has been worse too. Surprisingly it didn't take away root fof me.
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Old December 23rd, 2011, 03:10 PM   #5 (permalink)
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yeh battery life went down for me as well... don't know what's causing the drain... you can see the same threads on androidcentral and others about this.
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Old December 24th, 2011, 04:23 AM   #6 (permalink)
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Same here guys, I tried removing recent apps, stopping processes etc and finally put it down to 2.3.6

Can this be rolled back or do we have to wait for a fix or new update?

I wish I hadn't bothered.

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Old December 24th, 2011, 07:00 AM   #7 (permalink)
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The upgrade installed on my rooted SGS2 without a problem. I have had no phone issues. Having recently moved from blackberry to android, my experience on BB has been that anytime I changed or upgraded the OS, the battery had to settle in. I have had no battery problems after this upgrade but I would recommend letting the battery run down and recycle a time or two before assuming the sky is falling.
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Old December 24th, 2011, 08:13 AM   #8 (permalink)
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Yeah, after a few complete charge cycles the battery life is pretty much exactly the same for me.
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Old December 24th, 2011, 09:39 AM   #9 (permalink)
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Thanks. I'll have to try that then.
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Old December 24th, 2011, 01:31 PM   #10 (permalink)
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Was rooted with SuperOneClick, update d/l'd and stuck. Still rooted. Did at least one full cycle on battery. During that first cycle, I experienced this.



Since the 20th, when I did this battery refresh cycle with the update... this is the typical start to my battery life. Its still at 90%, however... that gap between OS and display will continue to increase and through regular use, my battery charge will more rapidly drain. Giving me less than a day, when prior to the update, I could easily go over a day.



Is 2 more refresh cycles, really going to change that?
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Old December 24th, 2011, 05:09 PM   #11 (permalink)
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Weird, I only had the android os use more battery then my display once back when I was on 2.3.4 and my battery started to get warm even though I didn't have anything open. Turned it off, pulled the battery until it cooled down, then started it up and it was fine again.
on 2.3.6 my display is always the highest consumed of battery, thats weird that yours does that, did you try a factory reset?
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Old December 24th, 2011, 09:50 PM   #12 (permalink)
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My wife just told me today that her battery life is sucking, she usually doesn't charge it everyday, she isn't a heavy user. Now she is having to charge every night, not really a big deal since she isn't a heavy user, but she said it has been noticeably worse.
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Old December 25th, 2011, 02:15 AM   #13 (permalink)
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Quote:
Originally Posted by schwenger View Post
Weird, I only had the android os use more battery then my display once back when I was on 2.3.4 and my battery started to get warm even though I didn't have anything open. Turned it off, pulled the battery until it cooled down, then started it up and it was fine again.
on 2.3.6 my display is always the highest consumed of battery, thats weird that yours does that, did you try a factory reset?
Oh no. No factory reset for my phone. I'll flash a new ROM before I do that.
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Old December 25th, 2011, 11:07 AM   #14 (permalink)
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I'm running 2.3.4 and my battery life overnight is starting to bug me. My iPhone 4 would use about 5% overnight, but my Galaxy S2 is using about 30. How does it consume that much when I'm doing anything and the screen is off? There are no active apps, and the only process I opened myself is the stock alarm clock.
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Old December 26th, 2011, 11:37 AM   #15 (permalink)
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Called Samsung Tech Service today and they said there have been no other phone calls about any battery issue since upgrading to 2.3.6 - If you haven't contacted Samsung I recommend that you do, they will need your IMEI #
They asked me to send in my phone for analysis which could take up to 6 days (they cover next day shipping both ways) I am considering doing this
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Old December 26th, 2011, 08:07 PM   #16 (permalink)
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Instead of calling (tongue i cheek i said I wasn't sure my battery would last though the on-hold time) I just did a service chat, and "Ray" said the issue wasn't listed in their database. I gave him the url of this forum and 2 others I've seen it discussed on, and he said he would bump it up to their next level of support, that the urls were very helpful - he took a look at the headers in this one while we were online, and also said he'd copy the support supervisor. For those of you who don't care to call, at least please do the online chat. Waiting time was only a couple minutes. Keep sending them urls that discuss the issue. Squeeky wheels and all that, if we want this to be a priority.
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Old December 29th, 2011, 09:14 AM   #17 (permalink)
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On 2.3.4, I could generally go 2 days without a charge... battery would be down to about 25% after 36 hours. Right after the 2.3.6 update on Dec 19, my battery suddenly got a lot worse, and hasn't improved any since-- if anything I think it may have gone farther down hill since then. With 2.3.6, it only takes about 8 hours to get to 30%, and now I'm having trouble making it all the way through one day without a charge. Android OS is eating around 85-90% of the battery, whereas before the display was always the biggest hitter. Is there any way to look at a detailed list of OS tasks to see which one is using all the juice? Any way to roll back to 2.3.4? I feel like I can't use my phone anymore because if I do, it might not make it through the day. This is not good.
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Old December 30th, 2011, 12:17 AM   #18 (permalink)
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I found a way to slow the battery drain slightly, it works for me atleast. if you restart the phone after you unplug it from the charger, it should help it somewhat.

i will try and post a screen shot tomorrow of the before and after reset if i remember not to reset as soon as i take it off the charger
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Old December 30th, 2011, 09:19 PM   #19 (permalink)
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Well, after 3 complete drain/charge cycles, my battery life appears to be back to normal. Since I got my Hyperion batteries today, I'm going to re-install Battery Left, so I can monitor discharging more accurately.

I am still experiencing Android OS as the #1 battery drain, however. Though, I don't really care, if I get my normal 24+ hour battery life.

EDIT: Spoke too soon on this one. No change in crap battery life. Just good having 3 batteries.
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Old December 30th, 2011, 10:09 PM   #20 (permalink)
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My battery has sucked since the day I got my GS2. Maybe it is because I have not fully let the battery die and then run it back up. My biggest thing is it so hard to keep from texting/ emailing, whatever while I am charging it. The only time it gets to charge fully is when I am asleep. I have thought about ordering the extra batteries but I don't want to have to pull my otterbox off every day to charge the battery.

I did however go almost a full day at work without music, text, or some sort of interaction with the phone (corporate was there). But even then after 8 a.m 100% to 4:30 pm when they left I checked my phone and it was at 40%. And went even quicker once I started using the phone. This was with 2.3.6/ and then not any better at 2.3.4 or 2.3.4 rooted ( but didn't understand what good the root was for)
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Old December 30th, 2011, 10:50 PM   #21 (permalink)
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Since I did one deep cycle my battery life seems better. Today, after very light use, it shows Display 83%, Android System 9%, Android OS 6%. That's more like it!
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Old December 31st, 2011, 01:05 AM   #22 (permalink)
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Quote:
Originally Posted by Infamous05gt View Post
My battery has sucked since the day I got my GS2. Maybe it is because I have not fully let the battery die and then run it back up. My biggest thing is it so hard to keep from texting/ emailing, whatever while I am charging it. The only time it gets to charge fully is when I am asleep. I have thought about ordering the extra batteries but I don't want to have to pull my otterbox off every day to charge the battery.

I did however go almost a full day at work without music, text, or some sort of interaction with the phone (corporate was there). But even then after 8 a.m 100% to 4:30 pm when they left I checked my phone and it was at 40%. And went even quicker once I started using the phone. This was with 2.3.6/ and then not any better at 2.3.4 or 2.3.4 rooted ( but didn't understand what good the root was for)
Yes, you need to do those cycles. Otherwise, your phone is not calibrated to the battery. You will get and show erroneous battery life.
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Old December 31st, 2011, 01:43 AM   #23 (permalink)
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Quote:
Originally Posted by jdCaptivate View Post

I am still experiencing Android OS as the #1 battery drain, however. Though, I don't really care, if I get my normal 24+ hour battery life.
Well I dropped down to 2.3.5 and Android OS is no longer being a battery hog. So Ima loop it down at that version until an update without this battery issue pops up
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Old December 31st, 2011, 07:56 AM   #24 (permalink)
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Default Battery Life Galaxy 2S on 2.3.6

Hi,
I had the same problem you mentioned here. This is what I did to resolve the problem.
1. Allow the battery to drain completely.
2. Remove the battery from the phone.
3. Put it back after couple of minutes and charge fully.

The battery life jumped from less than 12 hours to 24+ hours.
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Old December 31st, 2011, 08:15 AM   #25 (permalink)
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in 2.3.6 there seems to be a wifi bug that is draining the battery. Some people have said that recalibrating the battery fixes it for them but that seems to be a placebo effect and a simple reboot would have produced the same results. I have tested this and it is true, at least for me.
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Old December 31st, 2011, 08:57 AM   #26 (permalink)
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Does simply turning the phone off and back on accomplish a reboot, or is there more to it than that? Yesterday I let the phone go all the way down, then charged it up to 100%. I turned it off, disconnected from the charger, turned it back on, and then set it down and didn't touch it again until this morning. After 18h, 16m on battery with no use whatsoever, I'm down to 22% battery life. Task monitor shows that 97% of the battery went to Android OS and 2% went to phone standby, and that's it. When I was on 2.3.4, I would have 60-70% battery left after this much time. There's clearly something wrong here. How do I revert back to a previous version of the OS? For now I'll let it go the rest of the way down and then pull the battery and replace it before recharging, but if that doesn't do it then reverting to the previous OS may be the only thing left.
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Old January 1st, 2012, 01:15 AM   #27 (permalink)
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I've been thinking battery life has sucked since the upgrade, now you all are confirming it.

It got a deep cycle today so I'll see if it helps.
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Old January 1st, 2012, 08:44 AM   #28 (permalink)
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I've deep cycled two days in a row, and hasn't made any difference.
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Old January 1st, 2012, 08:50 AM   #29 (permalink)
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Quote:
Originally Posted by nyydynasty View Post
in 2.3.6 there seems to be a wifi bug that is draining the battery. Some people have said that recalibrating the battery fixes it for them but that seems to be a placebo effect and a simple reboot would have produced the same results. I have tested this and it is true, at least for me.
I have sporadically had the same issue. Sometimes I can go two days without charging and the next day Android OS burns my battery bad. A reboot seems to cure the problem each time. I have also found that it is indeed related to wifi as I can also cure the issue by turning wifi off. Something seems to be getting "stuck".
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Old January 1st, 2012, 05:35 PM   #30 (permalink)
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Originally Posted by mratlndmrk View Post
I have sporadically had the same issue. Sometimes I can go two days without charging and the next day Android OS burns my battery bad. A reboot seems to cure the problem each time. I have also found that it is indeed related to wifi as I can also cure the issue by turning wifi off. Something seems to be getting "stuck".
hmmmm, thanks mratlndmark, I will need to check this theory out by not using WiFi for a day and see if it improves the battery life!
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Old January 1st, 2012, 06:29 PM   #31 (permalink)
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ok two full cycles later my battery is still horrible. It came off of the charger this morning at 9:16am it is now 7:27 pm and I am down to 23% and the kicker was today I barely used the phone. I spent most of the day measuring out for a fence for the backyard and putting a lead up for my dog. The phone sat on the coffee table almost all day


Edit: Just checked what was using the battery/ Android os is the culprit for me as well.
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Old January 1st, 2012, 11:07 PM   #32 (permalink)
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Like I said in previous post, I deep cycled the battery two days in a row, removed the battery before starting the phone, turned off wifi and back on... and then today did absolutely nothing with the phone but let it sit there - no calls, text, nothing. After 5.5 hours, down to 66%, and Android OS is behind it.

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Old January 2nd, 2012, 10:37 AM   #33 (permalink)
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Charged mine back up last night after it went dead. Turned off Wifi and GPS, looked at it this morning and it had only used 2%. Compared to the previous night where I charged it up and went to bed it had used around 70% with wifi and gps on.
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Old January 2nd, 2012, 11:36 AM   #34 (permalink)
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Charged mine back up last night after it went dead. Turned off Wifi and GPS, looked at it this morning and it had only used 2%. Compared to the previous night where I charged it up and went to bed it had used around 70% with wifi and gps on.
I have to agree turning off WiFi seems to have helped me as well, no longer is Android OS my biggest battery hog and battery life is up considerably after 5 hours of normal use.
Not a "techie" so I'm not sure what is up with the WiFi bug as mentioned by mratlndmrk above?

Good short term fix, but since I am not on an unlimited data plan I rely on WiFi for the majority of my data usage.

1/3/12: Seems to be no doubt in my non techincal testing that something in the WiFi is off in 2.3.6: Battery life is much better keeping WiFi turned off and Android OS battery % has dropped down to 11% on average vs 83% with WiFi turned on.
I guess it could be a coincidence, but to me it seems to confirm what mratlndmrk stated in his post
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Old January 2nd, 2012, 11:57 AM   #35 (permalink)
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I am also having this battery drain problem- which I believe is wifi related.
You should be aware that there is an interesting mindset at both AT&T, and Samsung customer support. When you call to report this- or any other- issue, they will say that they don't have any record in their data base of this problem. "How is this possible?" I ask them. "There are whole threads refering to people who have contacted you on this subject," I inform them. They claim no knowledge of this.
Turns out, what is happening is that when you tell them about the problem, they say that they will note it to YOUR account. I suggest to them that if 1000 people are calling with an issue, and all they ever do is to note it to each individual's account, of course they will never have a data base which indicates a common problem which must be addressed. At that point they usually just say "Is there anything else I can help you with," or words to that effect.
Oh well!
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Old January 2nd, 2012, 04:44 PM   #36 (permalink)
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Ok SO I don't understand this. My battery was going great today with wifi and bluetooth turned off. Then on my way home I was at 57 percent and I turned off the phone to see if volume + was working properly and turned it back on to 14% battery remaining. What the crap happened.
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Old January 2nd, 2012, 05:17 PM   #37 (permalink)
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Im so ticked about my battery life after the update. I use little to 0 wifi and never have it on when Im not using it. My battery life went from EASILY 1 day while using it to now being at 24% at 8 hours 50 minutes. With very little use! Android os 34% Display 34% Messaging and standby and Android system are the rest.... WTF Sorry battery life was just one of the things I loved most about the GS2 and now its GONE! I hope someone is listening and working on this problem.
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Old January 2nd, 2012, 05:25 PM   #38 (permalink)
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I am also having this battery drain problem- which I believe is wifi related.
You should be aware that there is an interesting mindset at both AT&T, and Samsung customer support. When you call to report this- or any other- issue, they will say that they don't have any record in their data base of this problem. "How is this possible?" I ask them. "There are whole threads refering to people who have contacted you on this subject," I inform them. They claim no knowledge of this.
Turns out, what is happening is that when you tell them about the problem, they say that they will note it to YOUR account. I suggest to them that if 1000 people are calling with an issue, and all they ever do is to note it to each individual's account, of course they will never have a data base which indicates a common problem which must be addressed. At that point they usually just say "Is there anything else I can help you with," or words to that effect.
Oh well!
Agreed, I've called both AT&T Tech Support and Samsung Customer Service each on 2 occasions and heard the same thing
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Old January 3rd, 2012, 10:33 AM   #39 (permalink)
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I think we need to be the squeaky wheel here guys.
Perhaps we can start here: https://twitter.com/SamsungMobileUS
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Old January 3rd, 2012, 12:29 PM   #40 (permalink)
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I think we need to be the squeaky wheel here guys.
Perhaps we can start here: https://twitter.com/SamsungMobileUS
Agree 200% I need to get a twitter account and tweet (I think that is the correct term?)
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Old January 3rd, 2012, 06:44 PM   #41 (permalink)
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Default yes called both today and they told me.......

They told me they did not know anything about it I was the first to tell them.It is hard for me to believe with all of the posts here and some of my family and friends that have the same phone same prob......would a task killer app help??????
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Old January 3rd, 2012, 07:01 PM   #42 (permalink)
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Ok so I might post this in the wrong section but today was my first day running 2.3.6 with UnNamed rom v 2.2.1 and I must say! WOW!!!! Night and day difference. After all day of moderate use I am at 57% battery. This is also with wifi turned off as well as auto sync. Damn good rom.
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Old January 3rd, 2012, 10:56 PM   #43 (permalink)
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I knew i was going to be deskbound today, so when I pulled my phone off the charger I turned off the wifi, and just let it sit there. also turned off email polling, and lucked out with only 2 very short calls. After 12 hours I still had 90% of my battery left, the biggest user being the display, and Android OS 4th or 5th on the list. So yup, its obviously something goobered up in the wifi with 2.3.6.
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Old January 4th, 2012, 12:15 AM   #44 (permalink)
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I think we need to be the squeaky wheel here guys.
Perhaps we can start here: https://twitter.com/SamsungMobileUS
EXCELLENT idea! I just left them a tweet about battery life in 2.3.6. They can't say "We've never heard that before" any more!
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Old January 4th, 2012, 03:11 AM   #45 (permalink)
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I'm going to post this to my twitter, every day. Try to use the same keywords. I'm a noob Twitterer (?) Tweeter (?), so if someone has better idea, let us know.

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@Samsungtweets 1000s cant b wrong! 2.3.6 update 4 #GSII #i777 sucks battery life w/ bug'd #WiFi. #Samsung claims no knowledge of #bug!
I think the idea, of having to actively turn on/off Wifi, when I specifically want it to wake/sleep, when I turn on/off my screen... is horse dung and certainly not what I paid for. It is not on me, to flash a ROM (which I eventually will do, when I get bored with stock), or roll back updates to fix problem. This is a Samsung issue and they need to issue a fix immediately.

EDIT: Add @GalaxySsupport and send 2 tweets. Swarm these guys.
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Old January 4th, 2012, 01:08 PM   #46 (permalink)
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I'm going to post this to my twitter, every day. Try to use the same keywords. I'm a noob Twitterer (?) Tweeter (?), so if someone has better idea, let us know.

I think the idea, of having to actively turn on/off Wifi, when I specifically want it to wake/sleep, when I turn on/off my screen... is horse dung and certainly not what I paid for. It is not on me, to flash a ROM (which I eventually will do, when I get bored with stock), or roll back updates to fix problem. This is a Samsung issue and they need to issue a fix immediately.

EDIT: Add @GalaxySsupport and send 2 tweets. Swarm these guys.
I did receive a tweet back from Galaxy Support today, which stated stay tuned for updates. We shall see
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Old January 4th, 2012, 02:22 PM   #47 (permalink)
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I also tested my phone. After installing 2.3.6 and having wifi on I was barely getting a through a day without needing to recharge. I have had my phone set to wifi off for 2 days and I'm still on 50% battery. I am a pretty light user compared to a lot of you out there so this must REALLY be annoying to heavy users.

Hopefully this gets fixed very soon.
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Old January 4th, 2012, 05:55 PM   #48 (permalink)
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Ok SO I don't understand this. My battery was going great today with wifi and bluetooth turned off. Then on my way home I was at 57 percent and I turned off the phone to see if volume + was working properly and turned it back on to 14% battery remaining. What the crap happened.
I've had this happen SEVERAL times. I usually show a 20% drop, if I reboot.
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Old January 4th, 2012, 06:10 PM   #49 (permalink)
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I'm going to post this to my twitter, every day. Try to use the same keywords. I'm a noob Twitterer (?) Tweeter (?), so if someone has better idea, let us know.

I think the idea, of having to actively turn on/off Wifi, when I specifically want it to wake/sleep, when I turn on/off my screen... is horse dung and certainly not what I paid for. It is not on me, to flash a ROM (which I eventually will do, when I get bored with stock), or roll back updates to fix problem. This is a Samsung issue and they need to issue a fix immediately.

EDIT: Add @GalaxySsupport and send 2 tweets. Swarm these guys.
Yea, I am running a custom ROM and now actively shut off my wifi and data whenever I am not using it in order to maintain decent battery life throughout the normal day. As many things there as there are for me to love about my SGS2, coming from an iphone 4 the having to actively turn wifi and data off and on in order to get similar daily use as my iphone is annoying

Thankfully enough though I am in love with the flexibility of android because of custom roms and communities such as this one that the wifi and data thing is a minor concern. I am only glad that my wife who is on Froyo with her android based phone has zero issues with battery life - otherwise I would have to be in a world of her as for her a phone is an appliance it should just work!
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Old January 4th, 2012, 06:33 PM   #50 (permalink)
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Okay, the issue is definitely in the wifi. I just turned off wifi and my battery life massively improved.
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