yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Hmmm, mines doing much worse than this. Mine was dead after about 10 hours yesterday, screen brightness got changed at 50% to min and turned off wifi. I wonder what I'm doing wrong.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Next time you guys are near the end of a battery charge could you snap a screenshot of the battery usage page so we know what's draining on your system and we can compare? I'd appreciate it :D
[T-Mobile Samsung Galaxy S II SGH-T989] :
Another good way to save battery life is to use all black background and Blacked out apps.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Yep, hence the reason why I've been using an almost all black background :D

I added this to the first post under tips!
[T-Mobile Samsung Galaxy S II SGH-T989] samomamo:
After 5 hours of use battery still 100%?

After 5 hours of use battery still 100%? Something is wrong
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Wow. Just wow. Mine is almost complete opposite of that :confused:
[T-Mobile Samsung Galaxy S II SGH-T989] samomamo:
Something is wrong im using it hard trying to see a change and still 100%
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
If it just dies in a few hours then you'll know something is wrong! :D Nevermind, looked at the screenshots again
[T-Mobile Samsung Galaxy S II SGH-T989] Shoulon:
Nothing is wrong my sgsII is the same way. Even though important rockin sprint version
[T-Mobile Samsung Galaxy S II SGH-T989] aw1974:
It's definitely not at 100%. Look at the voltage, it's at 3.6. A fully charged battery will be around 4.2.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
If I may ask, what battery app are you using?
[T-Mobile Samsung Galaxy S II SGH-T989] samomamo:
Im using battery indicator
[T-Mobile Samsung Galaxy S II SGH-T989] vw671:
I also had the same problem with my Amaze and was one of the reasons why I sold it. Even after I rooted and debloated the Amaze it would consume the battery at almost the same rate whether the screen was on or off. My new S2 I'm happy to report is doing much much better!!! I have only gone through one charge cycle on it so I need to test it out much longer to see what battery life will really be like on the S2.
[T-Mobile Samsung Galaxy S II SGH-T989] DeathBlimp:
inconsistant battery use reporting?

i am looking at the battery use picture and it shows that 2 games i have using 11% and 10% (gun bros and slice it!)

i go to system tuner pro and look at the apps running but it's not in the lists of running apps, nor is it on any lists.

It does feel like the phone is draining its battery quite fast. what's going on?
[T-Mobile Samsung Galaxy S II SGH-T989] myunitisz:
Is there a good app thatll tell me what awakes my phone when screen is off . I'm thinking its latitude but I'm not positive.
[T-Mobile Samsung Galaxy S II SGH-T989] tabii:
http://xdaforums.com/showthread.php?t=1179809
[T-Mobile Samsung Galaxy S II SGH-T989] throwedyungg:
There an app or a way that our data could automatically switch from 4g to 2g (EDGE) once screen times out and vice versa once screen wakes up? Wouldn't this save battery life as well?

Samsung Galaxy S2
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
I would like to know this also
[T-Mobile Samsung Galaxy S II SGH-T989] wingtytn:
hey guys i removed all tmo apps and hav a few apps of my own thats running constant anywho my battery life with heavy usage is 8 hours give or take i play music for a few hours i send multiple text messages i make 2 or 3 calls during usages wifi stays on bluetooth is on during calls and music have about 10 apps running desksms weathergo because i use a live weather wallpaper clock batteryapp wifi gps and extended controls... with all that i hav running battery is ok music play is about 2hrs 2or3 phone calls at about 10mins wifi runs constant durning calls and music i bluetooth headset
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
yes, it sounds about right,

my Nexus S would not last me more than 4 hours :D

this phone + batter is very good IMO for heavy user, it can last aprox 8 hours give or take a few (for my own usage)

auto sync ever 30min to 1hr depending on apps

quite a bit of web browsing either WiFi or 4G, some games, many phone calls, lots of SMS, and push emails, BT and GPS on all the time, etc
[T-Mobile Samsung Galaxy S II SGH-T989] talltexan:
The link OP posted no longer works, what battery app are you using to show the battery life and when its been charged and such? im on about 10 hours since my last charge and 69% left. Love the Juggs ROM.

---------- Post added at 03:20 AM ---------- Previous post was at 03:07 AM ----------

never mind found it.
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
maybe one day i'll make screenshots but, i can tell from your screenshots that if you left your phone in your pocket all day, it would probably last 4+ days.

it's not pointless. the battery your save while the screen is off translates to more usage time. people saying things like "light usage" or "heavy usage" is whats subjective and pointless... =P

ideally the only things showing up after a few hours in your pocket, should be:

cell standby

phone idle

android os

display

there should be no blue marks in the bar causing the device to wake up (wakelocks). after a person has their phone like this, then they will have good battery life and adding things like background syncing is easy.

also, i'm doing this with rooted stock rom. you don't need a custom rom actually. having something to automate edge\4g toggle would be very nice tho.
[T-Mobile Samsung Galaxy S II SGH-T989] khoadpham:
How are you guys getting these kinds of numbers...
[T-Mobile Samsung Galaxy S II SGH-T989] tiguy99:
Right now i'm at 27.5 hour in a single charge and am just now getting to 22%.

My trick....turn off auto sync on the email, turn off background data, keep screen brightness < 50%, turn off auto brightness on the Web browser...that's it.

I didn't use any battery saving apps and I've been using my phone moderately all day
[T-Mobile Samsung Galaxy S II SGH-T989] goonx:
Hey guys,

I've been looking through this thread and haven't found the answer. Did anyone figure a way to change the "sync interval". I don't want to completely turn off my background data/sync as I need to be notified of incoming emails/facebook/what'sapp msgs. On my HTC sensation there was an option to change the sync interval but i haven't found this on the SGS2
[T-Mobile Samsung Galaxy S II SGH-T989] tiguy99:
.................
[T-Mobile Samsung Galaxy S II SGH-T989] sffish:
Battery Drain caused by 4G can JuiceDefender fix this?

I just got my S2 4 days ago. It was immediately rooted and I flashed Bombardier's latest stable ROM on to it. The battery life while using the phone was good. However, battery life while the phone was on standby (screen off) was disappointing. I'd lose 20-30% every 2-3 hours. I've been playing with it and found that if I simply switch the network to only use 2G the battery drain stops. With just 2G the battery drain is like 10% every 5-6 hours. Has anyone else noticed this?

Can I use JuiceDefender to switch the phone to 2G whenever it goes on standby and then back to 3/4G when I turn the screen on to use it? Will this work with the Bombardier ROM?
[T-Mobile Samsung Galaxy S II SGH-T989] PhxkinMassacre:
I'm sure it does in one of its 10384727826362 settings and whatnot but I don't know since I don't use it. From my experience (on my evo) I think it would be easier just to add a widget to your screen to toggle 2g 3g and 4g. If you don't have the toggles in your phone then download the app called widgetsoid. Its the app I use on my evo. Easy to use works really well and its free. Also if you have a problem the dev is very responsive. Good luck :)
[T-Mobile Samsung Galaxy S II SGH-T989] Blue1k:
Suggestions for Telus S2

Hi, after selling my Bell S2 and going to an Iphone 4S and now back to an S2 (this time from Telus) I found the battery life brutal compared to my Bell model.

When I had the Bell model I did a number of things to improve battery life (using Titanium) and was using Sicopat's rom.

Is there any Telus users who could suggest a good rom. I have tried a few including Mr. X's Telus rooted rom but I have found my battery to only last half a day at best.

Thanks in advance.

Running Mr. X Rooted Telus rom with Synergy kernel with underclock
[T-Mobile Samsung Galaxy S II SGH-T989] mintharis:
Are you on wifi or 4g for most of the day? I find that I'm lucky to make it home from work with more than 10% of my battery remaining. So I get about 11 hours of use on 4g while texting/browsing quite a bit before I need to charge.

I've tried undervolting, I've used juicedefender, but that seems to be about the best I can squeeze out of it.

I'm running the latest juggernaut ROM and bullet kernel.

Sent from my SGH-T989
[T-Mobile Samsung Galaxy S II SGH-T989] lexcyn:
I'm using just the stock Telus ROM and I get around 16h out of my phone, with moderate usage including phone calls and 4G surfing.

I am rooted and have reset battery stats as well as cleaned cache and dalvik, which seemed to help.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
i'm constantly on 3G, and the battery life is pretty good for me a power user, it last in average 8+ hr from the time i wake up to work

mail, facebook, twitter, etc, sync every 30min or 1hr depending on apps

if you are a light user, this phone can last you for more than a day on 1 charge, you can see that on the battery life topic
[T-Mobile Samsung Galaxy S II SGH-T989] orangejulio:
I had this happen to me twice. Both times I noticed that the phone was really warm in my pocket, and when I checked the task manager I found that an app was really running the CPU. The first time was the Accuweather widget running at 60% (uninstalled it immediately). The second time was Dolphin Browser, which was fluctuating from 10-25%. I uninstalled that as well, but I later reinstalled it and have not noticed further problems.
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
So is still dont think this has been answered......Is there a way to toggle 4g when screen is off?

4g is the culprit for battery drain. my GS1 would last all day with no battery saving apps.
[T-Mobile Samsung Galaxy S II SGH-T989] tabii:
^ Juice Defender
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
+1 for juicedefender
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
It only allows you to turn data completely off. Im looking to JUST turn 4g off and use edge when the screen is off
[T-Mobile Samsung Galaxy S II SGH-T989] tabii:
Then use Llama
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
Its has that option but it is experimental. I tried it and it does not work...Guess im SOL huh? :( any other suggestions?
[T-Mobile Samsung Galaxy S II SGH-T989] tabii:
Last time I used Juice Defender (paid version), it had the option to cut off mobile data while screen off and turn it on occasionally for programs like email to sync. Can't remember exactly. But why would you have one of the fastest 4G phones and only use Edge?. My phone is on 4G most of the time abd last me a day on moderate use which is good enough for me.
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
Well 4g uses a lot of battery. Now when im just receiving notifications I dont need 4g speeds, so instead i can save battery by using edge. Now when i turn the screen on I want my 4g to switch on so i can have my speed.

Now yes juice defender does let you disable and check every so often but sometimes I dont get my notifications (twitter,facebook messenger). Then when i check my twitter it shows it has not updated in 2 hours despite me having it update every min (inside twitter app).

Edit: I just looked under the advanced tab in Juice Defender ultimate and there are a hell of a lot more options. looking through it now :)
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
Telus SGS2 running CM7 and CM7 Synergy Kernel, I'm noticing much higher battery drain than with stock, even though SetCPU shows my CPU at 192MHz 70% of the time. Would setting minimum to 384 help? Battery stats shows Android System as the top resource hog.
[T-Mobile Samsung Galaxy S II SGH-T989] AllGamer:
CM based are know to always be heavy on battery

my old Nexus S running CM7 will suck it dry in 4 hours

you need to install Undelvolting kernels to make it work
[T-Mobile Samsung Galaxy S II SGH-T989] sffish:
I bought the Ultimate version of JuiceDefender hoping it would have the same switching 4g-edge when screen off, then edge-4g when screen on capability. I am using the Bombardier Rom and it doesn't work for that Rom. Supposedly it works for some Rom's just not all of them. Just and FYI. If you find an app which does the switching please post so we can all use it. Thanks. As is JuiceDefender does a decent job, although not as good when you just switch everything to edge.
[T-Mobile Samsung Galaxy S II SGH-T989] eep02b:
actual real life battery usage...

So as I read through this post, 1 question/thought keeps popping into my head... What is the point of battery saving apps if they don't allow you to do all the cool stuff the phone does... for instance- screen (why have a beautiful screen if you keep the brightness at 10 percent), automatic phone sync (you lose your phone, but your contacts /appointments are all synced automatically), notifications (what's the point of even having notifications if they aren't real time/push??) 4g data(why have it if when you aren't on wifi your phone is killed in 6hours by 4g data??) .I say all this to say if the battery won't last 10+ hours with all this on then what's the point? has anyone achieved the 12-18 hours reported without sacrificing all of this?? I'm just saying, what's the point of having the newest phone if hounding use half the features??
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
Really? My old Milestone runs CM7 like a champ, never really had less than 75% at the end of a day. Admittedly that was on a stock kernel though, as it's boot locked.
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
So far (strange) there is no app that actively switches from 4G to EDGE and vise versa, it must be manually done in the Mobile Networks Settings. If JD could perform this, i'd use it primarily to handle my mobile networks. Dono why it cant be done by an app and even if one could, the radio switch takes a few moments to turn one off and the other on.

---------- Post added at 10:34 AM ---------- Previous post was at 10:32 AM ----------

It is indeed a shame, but with the new custom ROMs and some smart disabling of some background processes, I have 4G on overnight, no wifi, running the latest Juggernaut 3.7 and Faux Kernel .005 with 1% battery drain/hour depending on the syncing that is happening (automatic gmail sync, beautiful widgets weather).

My drain used to be 10%/hour idle it was horrible >_<
[T-Mobile Samsung Galaxy S II SGH-T989] sffish:
Totally agree with you on that point. That's why the 4g to edge when the screen off would be great. That by far is a major battery saver and would be all you need. It's not the battery drain when the phone is in use that hurts, is the drain while the screen is off. When the screen is off do you really need 4g? I don't. As is I use JuiceDefender with everything on, screen to auto brightness and usually get 40-50% at the end of the day. I'm almost certain that if I could switch to edge when the screen is off it would be higher than 50% at the end of the day.
[T-Mobile Samsung Galaxy S II SGH-T989] eep02b:
what background processes are you disabling??
[T-Mobile Samsung Galaxy S II SGH-T989] vw671:
Have you tried Lama?

https://market.android.com/details?id=com.kebab.Llama&hl=en

You have to add two events, one for screen off and one for screen on an associated action to disable and enable 4G.

I've been using Lama for a long time but for a different purpose. When I'm connected to my home WiFi network, I have it put my phone in Airplane mode (*WiFi enabled through the Airplane Settings app). I then have GrooveIP automatically login via WiFi only and I can receive and send calls and have WiFi when at home. Battery life is crazy good:)
[T-Mobile Samsung Galaxy S II SGH-T989] eep02b:
the 4g toggle for that program is for wimax... doesn't work with my phone at least...
[T-Mobile Samsung Galaxy S II SGH-T989] sddale2001:
I have this problem as well. I guess I should just keep the wifi running when the screen is off since it goes into 4g if the wifi is disconnected.
[T-Mobile Samsung Galaxy S II SGH-T989] vw671:
Sorry, your right. Only option in Lama is to disable all data altogether via disabling APN. Only other option I've found to do what you want is this:

http://www.appbrain.com/app/superpower-xda-beta-v0-80/nl.morose.superpower

I've used it in the past but not on the GS2 so YMMV.
[T-Mobile Samsung Galaxy S II SGH-T989] eep02b:
I really wish that program worked... but all it did was screw up my data...
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
Might be a placebo effect, but it looks like setting minimum freq of 384MHz has improved battery drain.
[T-Mobile Samsung Galaxy S II SGH-T989] sddale2001:
I was just thinking...why would the program be able to turn off 4g when the wifi is on but not when the screen turns off?
[T-Mobile Samsung Galaxy S II SGH-T989] tabii:
In Llama, use Mobile Data instead of 4G if you want to turn off 4G.

Also, I can confirm setting min clock to 192Mhz actually doesn't help with battery life. I guess it'z because voltage saving is minimal but there's an additional frequency to scale to.
[T-Mobile Samsung Galaxy S II SGH-T989] epresson:
Juice defender beta adjusts the radio from between 2G, 3g, and 4g as needed. Its only in the testing phase but it seems to be working on my T989 so far.
[T-Mobile Samsung Galaxy S II SGH-T989] sddale2001:
If I use mobile data then I don't receive my emails.
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
A day later, I can confirm that setting my minimum frequency to 384MHz in combination with ondemand scaling has dropped "Android OS" usage from about 24% in Battery Usage, to about 10%, and where I was around 45% this time yesterday, I am around 65% today, with very similar usage.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
This is all with SetCPU, correct?
[T-Mobile Samsung Galaxy S II SGH-T989] SwervFusion:
I love this tip right here. I use groove ip too. Using wifi+airplane mode while in with wifi with has allowed my battery drain to be no higher then 179mA..average in the 60-70 range while browsing the web and xa for the last 3hrs..and i left that setup on while i was sleep and it drained only -2mA every 5mins on my setup (newest synergy kernal with on demand set and only backgroud syncing not gmail)..

I Have two issues. I cant get llama to configure correctly so i have to set manuelly. Pics please? Llama glitched my wifi and airplane mode in an endless loop so i dont know what im doing wrong.

And the 2nd thing is turning off 4G but leaving a data connection on while the screen is off. for everyone else i guess juice defender works great and it did save my battery using the free version, but with groove ip we need some type of data still on or else we wont get phone calls. Is this even possible?

I agree with other posters..no need to have 4g on while im not using the phone but absolutely when i screen unlock. Evdo would be adiquate during that peruod if its possible?
[T-Mobile Samsung Galaxy S II SGH-T989] SwervFusion:
Is this only for ultimate owners beta? I downloaded the free beta and i didnt have those options. Hesitant on paying for it if its not going to work right and the return policy window prob wont give me enough time to test. Are ur saying it can set set to 2G on our phones while the screen is off and turn it back to 4g when its on? Can anyone else confirm? Thanks.
[T-Mobile Samsung Galaxy S II SGH-T989] sffish:
What ROM are you running? I'm using Bombardier 3.5 and the beta switching between 2g, 4g doesn't work for this ROM. Thanks.
[T-Mobile Samsung Galaxy S II SGH-T989] vw671:
Here's how I have mine setup, works like a charm. Been running this way for about 2 months now. dd-wrt is the name of my access point.
[T-Mobile Samsung Galaxy S II SGH-T989] epresson:
I havent seen it actually go do 2G but I have seen it go to 3g on screen off. I'm running Juggernaut 3.7 on Bullet 2.9 Kernel. I'm getting easily 2 days worth of battery out of using Juice Defender but that's with using the option to turn off mobile data entirely at screen off. I get less if I use the 4G to 3G switching option instead but its still much better than without it. I also did buy the ultimate version and then downloaded the beta to use.
[T-Mobile Samsung Galaxy S II SGH-T989] SwervFusion:
I think I have to switch my rom :-| .. I'm looking at your picture for the "airplane" mode settings and I don't have those settings (which is listed as Flight Mode, and there is only one option to disable all the radios) or perhaps I'm not looking in the right area, can you tell me how you got to it? I'm using BeastMod 3.5.
[T-Mobile Samsung Galaxy S II SGH-T989] vw671:
It's an app in the AppStore:

https://market.android.com/details?id=com.wparam.airsettings&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS53cGFyYW0uYWlyc2V0dGluZ3MiXQ..
[T-Mobile Samsung Galaxy S II SGH-T989] SwervFusion:
Yup. That did it for me. What was happening was when Llama was turning on airplane mode and wifi, airplane mode was disabling wifi ... so it would just loop. Everything tested working great now.

Thanks!
[T-Mobile Samsung Galaxy S II SGH-T989] eep02b:
So I don't know about people getting 20 hours from their phones, but with 4g, gmail and everything else syncing, playing games, texting, talking, screen on auto brightness, and everything, I'm just barely under 11 hours which is pretty dang good to me. Had I been on wifi instead of 4g at work id prolly still be at 50-40 percent. pics attached...
[T-Mobile Samsung Galaxy S II SGH-T989] Supremancy:
yea this is about where I am at when on 4g...
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
Here's one of mine after tethering all day and moderate usage.

Normally after a 12 hour shift of heavy usage I have 50-60% left.
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
Can you guys post how much on-screen time you guys get? (Press on display in battery use and it says). I wanted to compare the on-screen time, because its hard to compare with other people's usages otherwise.
[T-Mobile Samsung Galaxy S II SGH-T989] _eroz:
Mother of all - - - BATTERY Life Thread - - - Tips & Tricks

Hi all, I am running juggernaut 3.7 with bullet 2.9b. Recently after playing games extensively, mainly game Dev story, I've noticed that device management is at the top of battery usage. That was never the case before. It was never one of the apps listed before. Is it safe? Is there something else at play here?

View attachment 813860
[T-Mobile Samsung Galaxy S II SGH-T989] Branso07:
Mother of all - - - BATTERY Life Thread - - - Tips & Tricks

What is the most battery saving rom and kernel combo? My battery life with bombardier is as bad as an iPhone currently...
[T-Mobile Samsung Galaxy S II SGH-T989] _eroz:
I figured out what it was. Somehow, it was backing up information to Google's server. I went in and disabled Back Up My Data in the Privacy Settings. I would have posted in the thread I created but it was closed.
[T-Mobile Samsung Galaxy S II SGH-T989] safeplayer22:
I know it's been said somewhere b4 but I figured this would help in case others don't know. Using WIFI significantly increase your battery life over 3g/4g.

I've noticed the difference when i was connected to WIFI all day compared to using 4g doing the same exact things.
[T-Mobile Samsung Galaxy S II SGH-T989] PJcastaldo:
I am using the latest Beast Mod overclocked at 1.8ghz and am at 50% after over 8 hours of use. I have attached a few screens of my battery use so you guys can compare your use to mine. I would call me a moderate to heavy user.
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
Can you click on Display and tell me how much on screen time you have? :D