yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
maybe the reception is not that great inside the school building, and it tries harder to get a phone signal lock

it's a known issue with all phones

that eats up battery, when it constantly tries to find a stronger signal
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
I'm inclined to think it's that, but what can I really do about it?

EDIT: is it possible that the phone looking for a stronger signal (even though I keep 3G/4G) can be keeping my phone awake?
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
set the phone to only use 2G (EDGE) when you are not using it

as some people have mentioned earlier, either manually, or use apps like juice defender, to automate that process

when it's screen off stay in 2G

when it's screen on go back to 3/4G

there's also another app that i like, which automatically set the phone to airplane mode, when it loses signal

then it checks for signal every 5~10 minutes or whatever you configure it to.....dang forgot the name of that App
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
I didn't think that Telus had 2G, I'm sure Wind has it, but Telus doesn't..

Do you think that rooting might help if I can pinpoint which app is staying in memory the entire time?
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
found it!

NoBars Battery Saver

by Tom Dryer

https://market.android.com/details?id=com.tomdryer.nobars
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
my bad, forgot about that

yeah, both Bell/Telus are stuck on 3G/4G

only Fido/Rogers have 2G

no Wind & Mobilicity is also always on 3G/4G only, yes we can go 2G but then we'll be roaming on Rogers, and cost mucho money $$$ :p
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
True :p have you gotten your GS2 yet? I hope somebody could provide some more insight into what might be killing my battery other than the phone signal being bad at school. :p
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
it just arrived at fedex, i need to go pick it up, waiting for the truck to return back to the depot
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
Exciting! :D
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Not if you are using juice defender or the likes.
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
I'll look into using Juice Defender, thanks! Last night at home, my phone was on wifi all the time and lost a lot less battery than the same amount at school. Definitely some word stuff going on at school :p
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
I agree its definitely looking for signal.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
if it's really just a signal issue

then you don't need juice defender, just get NoBars Battery Saver

juice defender is a bit too intrusive, specially if you are into custom ROMs and stuff, it might conflict in some settings with the optimized settings/options in custom ROMs

for some tasks, simple is better ;)
[T-Mobile Samsung Galaxy S II SGH-T989] skadude66:
Downloaded that as well, I will definitely give it a try on Monday and let you know how it went :D
[T-Mobile Samsung Galaxy S II SGH-T989] Wareazy:
Tried this. MUCH MUCH APPRECIATED

No changes at all just rooted my T989. And set it to 384/128 screen off.

battery percentage drop was about 2%-3% over the course of 2.5 hours.

with moderate use, some trillian, 3 emails, and 4 calls.

Responding to http://xdaforums.com/showthread.php?p=18834229#post18834229
[T-Mobile Samsung Galaxy S II SGH-T989] kriEv:
Having worked in telecom and tested networks a lot (Rogers) i can tell you that if you ever looked at a phone with the Engineering Mode turned on, you will notice that even with a max signal, the phone is ALWAYS looking for better reception, the fact you are in a building doesn't really mean anything unless you are enclosed in concrete.

What you are probably dealing with is this. You are being serviced by 2 towers close by and the sectors are overlapping. Because of the fact you are indoors, the signal will bouce around so your RSSI will fluctuate making your phone switch from one sector to another, therefore, draining your battery. :S
[T-Mobile Samsung Galaxy S II SGH-T989] fbueller:
I'm on rooted stock and getting 3-4% drain an hour with the screen off, untouched, with GPS and Wifi off. Nothing much happening in the background. When the screen is on (not doing anything, just on) I get 1% drain every minute or two. This sucks.
[T-Mobile Samsung Galaxy S II SGH-T989] thenitzel:
This thread makes me want to cry. This is my first Android phone and I was pissed after all that tweaking to only get 28 hours out of my phone. I come on here and read that in fact thats superstar status? Oh Blackberry, your battery's ghost is haunting me at night. Too bad your app store sucked.

Thanks for all the tips everyone! Looks like I'll have to live with crappy battery life from here on out :( How in the world can the CM7 Nook pull off 3 days of battery life???

If anyone cares I can post what I am doing to make the battery last that long: Underclocked SetCPU like everyone else has mentioned, also heavily configured Llama (has anyone got it to turn off the 4G? I get WiMax error?). Running Jug 1.1 with a mostly black background/lock screen.

Any hope to get a full two days out of this thing? Solder my blackberry's battery to it maybe? :p
[T-Mobile Samsung Galaxy S II SGH-T989] Liquid5n0w:
If you pay attention to your battery use monitor, you'll see that the single largest user of battery was the screen. Notice the difference in screen size, quality and brightness between a modern Android display and a few years old Blackberry?

Also the device to battery ratio is much higher in a Blackberry. The design goal of almost any android phone is 12 hours of full use to get a dead battery. That works for anyone that plugs in their phone at night. Which I think is a more then reasonable target.
[T-Mobile Samsung Galaxy S II SGH-T989] turbodroid:
The best solution for battery life is to always have a fully charged battery to drop in when it's time. Like I did with my Nexus S, I have purchased (en route from China) a wall/dock charger and an extra OEM battery or two. The beauty of this is I NEVER have to plug my phone in to charge it. I pop a fully charged battery in when I head to work in the morning. When I come home or go out later, I pop in a fresh battery again. I always have a fully charged battery ready. Since I got this phone I have to constantly charge it and I absolutely hate it.

Anyway, I ordered this charger off Ebay. And I was going to wait until it shows up before I order the batteries. If anyone cares, I will update the thread on how it works.

http://www.ebay.com/itm/230691742353?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
I use 'screen adjuster' from the market and turn my screen all the way down in settings, then set screen adjuster to 65% at night and 75% during the day. It really seems to help.

Unless I'm out in the sun I leave it on all the time. Mind you my fascinate's screen is pretty bright to begin with.
[T-Mobile Samsung Galaxy S II SGH-T989] Babyj303:
Im getting great battery life

Sent from my HercuBEAST!!!
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
What are you using that displays the battery level as a percentage? Way more convenient.
[T-Mobile Samsung Galaxy S II SGH-T989] Nismo13:
Yes it looks like he is using beastmod rom with some sort of battery mod on top of it

Melvin said he would never include a battery mod with his rom as it would compromise the battery life.

I am also wondering if you could post the download link to this mod as it looks nice with that rom and it seems you are getting great battery life with it lol
[T-Mobile Samsung Galaxy S II SGH-T989] Babyj303:
Im using juggernaut 2.0 with kang kernel .03 oc to 1.626 currently. All available from the dev section!!!

Sent from my HercuBEASTly Thingy!!!
[T-Mobile Samsung Galaxy S II SGH-T989] Maazer:
I cracked my LCD screen and called T-mobile to say my phone was stolen. I have insurance so they sent me a brand new phone in-box. I placed my old phone in its original case in my closet. Two days after receiving my new phone, my alarm was going off. I glanced at my phone to reveal it wasn't the new phone, but the old one in the closet going off. I recall the broken phone being at around 40-50% before I dropped it. Interesting how ridiculous the display destroys battery life on these devices. I'm coming from a Vibrant modded with Axura and Simply Galaxy.
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
ive had this phone for a few days now and its been going great but battery life is a little annoying. BUT!!! i did notice when i put on a new rom(beastMOD) the battery life was crazy good. also i left it stock settings for awhile before downloading all the apps i had before. when it was stock i got about 36h on a full charge with just texting,calling,web,and movies from sd card. As soon as i started putting all my apps i had before my battery life went to **** and battery drained pretty quick..... id say 7-8h on a full charge. Im thinking its some of the apps for sure because it was great before i started up all my apps. ill be going for a battery run on my days off and see how much i can get out of this thing.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
I could agree with this. Definitely with looking in to.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
battery life in this phone is amazing

now that i've ran a few days with it, i can say for sure that 1 single charge last quite a lot longer than the Nexus S

over the weekend i unplugged it, and i've been on WiFi for most of the morning + afternoon download and updating my apps, after migrating them over from Nexus S

even after several hours (+6-) of straight usage, the battery was still above 65%, the same thing on the Nexus S would have drained it dry already on 4 hours
[T-Mobile Samsung Galaxy S II SGH-T989] M49MuM.357:
Mine barely lasts a day with moderate use, especially when I am in college and service sucks in that area, so it constantly looks for service. I can't just put it in Flight Mode because I need to stay connected. Hope Cyanogenmod gets released soon, it had the best battery life on my previous devices
[T-Mobile Samsung Galaxy S II SGH-T989] lexcyn:
Any more updates on the 100% battery bug? This can't be a hardware issue if a reboot fixes the issue. Any way we can run a debug on this somehow?
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
OK!! quick update ive tried a few things and i seem to be getting great results as of right now im 82% with 13h 47m 18s. I guess my theory is correct on battery life apps is the problem. So what i did is backed up my current rom before deleting more system apps just incase i ****ed something up. i also turned off syncing accounts in the account manager. I also tried to stop all the apps using a task killer that was a fail DO NOT DO THIS!!! instead i went straight to applications and closed all of them one by one. after that i toggle between going from edge network to 4g only turning it on when i need it. And if i check my FB once im done i sign out and go to applications to totally stop the app from running in the background. Ill post up more results as time goes by maybe tonight update on battery. I noticed i went down maybe %1 in 2h of the screen being off then opening to check my stats. Also goggle maps seems to keep opening up even tho i dont touch it..... anyways ill update my stats later.
[T-Mobile Samsung Galaxy S II SGH-T989] MrGibbage:
Is this "100% battery bug" where the phone seems stuck at 100% and won't charge unless you reboot? If so, that is what my phone is doing. Battery life IMO is pretty good--I've been able to reach 48 hours on a single charge a couple of times, but I do have to be careful when plugging in my phone to make sure it is indeed charging.
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
Wow... sounds amazing, So you are running BeastMOD 2.0 / Synergy kernel?

Are you using any battery saving apps?
[T-Mobile Samsung Galaxy S II SGH-T989] lexcyn:
Yes that is the bug. Don't know how we can resolve it.

But yeah my battery is pretty good, on the first couple of charges I have been able to get around 16 hours of charge, with pretty moderate usage. I expect it to level off after the first 5 or so complete cycles.
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
I've noticed that the longest posts are in the battery life thread.

Coincidence?
[T-Mobile Samsung Galaxy S II SGH-T989] le14:
In regards to Rom's what is everyone's opinion on the Rom that provides the best battery life?
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
heres an update ill keep everyone posted screen shot was taken at the same time.
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
actually im just running beastMOD with whatever came on it no updated kernel yet. also im using no type of battery saving apps.
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
You said youre turning off radios when not in use, are you using wifi? Screen off most of the time etc.
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
no i didnt say i turned off my radios im toggling between edge network and 4g. 4g only when i need it and i switch to edge when im just calling or texting or when my screen is off im not using any wifi either
[T-Mobile Samsung Galaxy S II SGH-T989] le14:
the benefits of being rooted I suppose. There is no way to toggle from edge and 3g/4g on the stock rom is there?

also, what rom are you running?
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
yes there is a way actually on any rom wireless and network settings then mobile networks and then lol network mode. I am running BeastMOD
[T-Mobile Samsung Galaxy S II SGH-T989] 513263337:
I'm having similar results...

Very frustrating... The phone was not even screen on.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
try that

http://xdaforums.com/showthread.php?t=1322050
[T-Mobile Samsung Galaxy S II SGH-T989] josemedina1983:
I'm getting around 8hr of battery life a day it kinda sucks if I put it on 2g ill get maybe 12-14hrs
[T-Mobile Samsung Galaxy S II SGH-T989] atrade:
Does anyone else have the issue when you setup Llama to toggle mobile data off when your connected to wifi that all data shuts down no matter what? If my mobile data is toggled off my phone simply does not get any data.
[T-Mobile Samsung Galaxy S II SGH-T989] 513263337:
Oh my god I'm looking at a clone of me.

I have very similar situation...
[T-Mobile Samsung Galaxy S II SGH-T989] lexcyn:
I've tried those steps a couple of times and still nothing. Maybe I will try flashing the Telus stock again and doing the steps again.
[T-Mobile Samsung Galaxy S II SGH-T989] Imapuckhead:
I have the same issue. rebooting seems to resolve it but it is annoying. It also seems to not be consistent, as it does not always seem to do it.

For me it did it on both EB 1.1 and BeastMod 2.0.

Anyone else have any input on how to prevent this behavior from happening?
[T-Mobile Samsung Galaxy S II SGH-T989] atrade:
That makes perfect sense as I was on both Beastmod versions when I tried it too. I'm assuming then that it works fine on others?
[T-Mobile Samsung Galaxy S II SGH-T989] wondercoolguy:
Here is my exact set up I'm currently 17hrs 46m and I'm at 47% battery life. Moderate use, I use gmail, gtalk, and text. Haven't made a phone call on it yet.

Rom

http://xdaforums.com/showthread.php?t=1333319

V6

http://xdaforums.com/showthread.php?t=1318631

Andrinaline

http://xdaforums.com/showthread.php?t=1315849

Setcpu

Main 1836 / 384 ondemand

Screen off 810 / 432 ondemand
[T-Mobile Samsung Galaxy S II SGH-T989] azsl1326:
Running on rooted stock. Not sure how I am getting such great battery life. I did recently make a change to Llama having it kill the data when the screen is off. I lost only 2% over night and have 65% remaining after 24 hours!
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
update.... im now on 2 days 13h 30m and have 36% battery left. ill update again tonight.
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
it seems like the best times myself and others have are around 1% per hour, screen off, cell phone radio on. this comes out to about 4 1/2 days. i'm curious, has anyone managed 5 days of battery life, receiving a cell signal the whole time?
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
This is just pointless now no?
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
screen shot of this 4 1/2 days of battery?
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
5 days in the life of coma phone -_-
[T-Mobile Samsung Galaxy S II SGH-T989] mayonaise:
I have the 100% battery life issue, but I only started seeing it two weeks after I got it (conveniently after Wirefly's 14 day return period)... Out of the box the battery meter worked fine. It was working well until yesterday - exactly two weeks after I received it - when the battery meter got stuck at 100% in the morning.

Whether it does anything or not, I have been running the battery till its completely empty before plugging it in. I've also been using a couple different USB wall chargers, in addition to plugging the phone into a computer to charge. I'll have to compare the specs for these chargers to the one that came with the phone.

I also used an apparently faulty micro-USB cable to try to charge up the phone a few days ago. The power would keep going in and out. Could something have gotten messed up by this? This wasn't the cable that came with the phone, just one I had from my previous phone. I won't be using it anymore...

Hoping this issue can be fixed, or I can somehow get a replacement.
[T-Mobile Samsung Galaxy S II SGH-T989] :
The 100% battery issue I only get with the stock battery. Any themes or anything I don't get the battery issue.
[T-Mobile Samsung Galaxy S II SGH-T989] caliswag707:
ok heres an update 24% left and 3days 4 hours 18m
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
Wow bro what rom/kernel / energy saving apps are you using?

For me:

This was with 2 periods of airplane modes, but I'm still loving the battery life of this phone so far!
[T-Mobile Samsung Galaxy S II SGH-T989] a4 moda:
Does this battery life seem right?

I'm posting s screenshot. I just want to ask how everyone else is doing with battery life.

I'm running juggernaut 2.6 with the kernel that came in the ROM, but battery life sucks.

Any help?

Thanks

T989 Galaxy S2! !
[T-Mobile Samsung Galaxy S II SGH-T989] 513263337:
Troubleshoot my battery life issue...

Finally, I'm fed up with my battery.

It drains so unbelievably fast:

- no usage at all, screen off, data off, it drops 4% per hour

- no usage at all, screen off, data on, it drops 8% per hour

- some normal usage, it drops 25% per hour!!!

I've tried:

- set brightness to lowest

- turn off background sync

- go into each individual app and turn off push notification, automatic update etc

- use SetCPU to reduce CPU frequency (384 max) at screen off

- use JuiceDefender to turn off data at screen off

- calibrate battery

Nothing works!

I'd expect by doing all of the above at least something will improve a little bit. No, they have no effect at all.

I don't think it's a battery problem. I strongly believe it's because I installed too many apps (10 pages in app list, is that considered too much, or not?) and some of them must be doing things constantly in the background.

I've always been lazy and didn't want to bother finding out exactly which app(s) are doing this to me. But now it's gone to a point that it's unbearable.

So, I decided to go down this route to troubleshoot:

- use Titanium Backup to back up all my apps first

- freeze ALL user apps that I installed, basically making the phone back to factory state

- observe the battery performance

- enable apps one by one and observe battery performance along the way

What do you guys think of this strategy? Am I going in the right direction? Or is this just another hopeless approach? What else can I try?
[T-Mobile Samsung Galaxy S II SGH-T989] wondercoolguy:
Since your phone is already rooted I'd suggest to look at my signature and do all that I've done. You're going to hate me for this but with my exact set up per my battery usage screen right now...1hr 42mins and I'm 99%....

That is with light usage right now.... but I've gotten up to 25hrs on one charge w/ moderate usage....
[T-Mobile Samsung Galaxy S II SGH-T989] TheSeanTeam:
How do you get the information on the bottom (phone signal, GPS, Awake, Screen On, Charging?) Is that an app? Is that something I need to turn on? Spare Parts? Or am I blind?

I don't have it on my battery information screen.

Thanks!
[T-Mobile Samsung Galaxy S II SGH-T989] mrxiong81:
so in the morning i have 100% battery life up till 3 or 4pm and then all of the sudden the phones battery goes red and or dies on me..

scared the hell out of me.. i thought my phone got bricked in my pocket somehow.. didnt touch it for about an hr pulled out of pocket to c no launcher. then tried powering it on, samsung screen came on, and went black screen.. did it over and over.. tried to boot into recovery mode and nothing.. then booted it up with odin and after it started the phone gave me a severely ow battery message.. hope this doesnt always happen..

anyone else have or run into this?? i have only had the phone for 2 days at most and got it to finally root after trying 10 or so times the first day i had it..
[T-Mobile Samsung Galaxy S II SGH-T989] :
settings/about phone/battery use/click graph on top.
[T-Mobile Samsung Galaxy S II SGH-T989] TheSeanTeam:
Wow. It was under my nose the entire time. Thanks for the info.

Much appreciated!
[T-Mobile Samsung Galaxy S II SGH-T989] sgastel:
I had the same problem with my Sensation I thought all Sensations were like that but then I just got fed up and I took it back and got a new one and problem was gone. So far my SGS2 has had more then reasonable battery life so I would take it back and exchange it and see what happens.
[T-Mobile Samsung Galaxy S II SGH-T989] bronzee:
ok ive read almost 90% of this thread and maybe my eyes are just dying or its in the other 10% of what i missed.

but can someone tell me how to set juice defender to turn off 3g/4g when i put my phone to sleep? and turn it back on when i start using it again? right now i have it set to turn of mobile data off but i need gchat and some chats running. it signs me off because it turns everything off. so i would like 2g/edge to still be on while my phone is asleep.

or is there another app that does the same thing thats better to use?

im rooted with stock everything. i get great batt life too. usually about 16 hours. with tons of texting and a lot of browsing. with about 30% left by the time i plug it in to sleep. i just want to maximize that even MORE. :o
[T-Mobile Samsung Galaxy S II SGH-T989] 1buprofen:
My phone does a screenshot when i use this button combo??
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Yes. Take a look at your gallery and you should find the screenshots. It should vibrate and make a vignetting animation when you do this.
[T-Mobile Samsung Galaxy S II SGH-T989] ryan562:
My Nexus S doesn't go past 98 pct and my vibrant did the same. Its quite normal
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Let's put this to rest.
[T-Mobile Samsung Galaxy S II SGH-T989] x-ravin:
14hrs with 34% left. So theoretically if the discharge rate is linear I should see 21 hours total life to 0%. Of course we know that won't be the case :p
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
That's very good. What kind of apps do you have installed? More importantly what has your usage been like? Wifi on? Screen brightness?
[T-Mobile Samsung Galaxy S II SGH-T989] x-ravin:
Wifi and GPS on, brightness set at about 40%, gmail on push, k9 mail imap push, weather bug on auto update with geolocation, RSS sync in background, live wallpaper, web and text usage.
[T-Mobile Samsung Galaxy S II SGH-T989] iunlock:
My SGSII (Herculues) lasts me a full day without charge....calls, lots of picture taking, browsing and some text...

At 1850mAh that's pretty impressive...