yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy S II SGH-T989] orangejulio:
I am using Dewizzed 2.0, but I have been much happier since I upgraded to the Faux 0.9 kernel a couple of days ago vs. the 0.7 Dewizzed included. It has gotten my idle battery life really close to where it was when I was using the Synergy kernel. I had given up on Synergy, though, since my phone would sporadically start using way more battery at random times, even though I had carefully strippped out all apps and optimized everything for minimal battery drain. Faux's 0.9 is performing pretty close to Synergy but just seems to work better for me. During the night, I am sitting at 1% per hour.

For the first time, I am hitting my goal of 2 full days with moderate use. I played music for a couple of hours while commuting, and I checked my feed reader and email at random times throughout the day. This is without a lot of screen on time, of course. What I like about the Faux kernel is that there is next to no wake time outside of screen on or playing music.

I am undervolted to the absolute lowest voltage that my phone will accept for each frequency, and I have been underclocked to 1.08 GHz. My screen off profile is fixed at 384 MHz. With the GPU acceleration in Faux ultimate, the phone is still just as responsive as it was with some of the overclocked kernels. In fact, I just took it down to 918 MHz, and it still feels pretty snappy. Since I am not playing games with my phone, it doesn't need to be a powerhouse.

I have gmail and google contacts set to full sync, and my work exchange server is set to update once every 24 hours. I just refresh manually, if I want to look at them. Otherwise, I have all apps set to manual sync.

This morning I was at 48% remaining after 26 hours off the charger. Even now towards the end of my work day (not shown below), I am still over 30%. That's an overall average of 2% per hour! Clearly it won't last like this on days that I use it heavily, but at least I never have to worry about getting through a day now. When I used the stock ROM, I could almost never make a full day!
[T-Mobile Samsung Galaxy S II SGH-T989] mikea3000:
Can someone please tell me if my battery life is normal. My phone is 100% stock. I take it off the charger at 7AM and it is usually dead by 8PM. I only use the phone for texting and voice calls, as such my biggest use of battery is always, voice calls and display. On average I get 3 hours of voice calls and screen time combined. I am on the phone roughly 1.5 hours a day and my screen time is generally 1.5 hours as well. I send about 300-500 texts a day.

Additionally, all syncing is off except for gmail.

Am I correct to think that I should get better battery life. Please help me undersand.
[T-Mobile Samsung Galaxy S II SGH-T989] phreshjoker:
Bro thats 13 hours of battery life. Thats amazing!!
[T-Mobile Samsung Galaxy S II SGH-T989] kvizz:
Switch to Bombaridier ROM. Battery life improved immensely.

Not bad I guess, I can go a full day...
[T-Mobile Samsung Galaxy S II SGH-T989] trypt4mine:
Juggernaut ROM with darkside kernel gives me good battery life
[T-Mobile Samsung Galaxy S II SGH-T989] twolfekc:
I can get about 4 hours and 30-50 minutes until my phone dies. Is that normal?
[T-Mobile Samsung Galaxy S II SGH-T989] grenademasta:
That all depends what you are doing. If you are gaming for 4 1/2 hours you can burn your battery real fast. The last three days I have averaged 34-35 hours of battery use per charge. My best ever with this phone.

I am on rooted stock with Faux's latest kernel #009 mainline edition.

My battery is the Samsung Galaxy Nexus extended 2100mah battery ($24.99 at Verizon store) that fits in the phone with no problems.

In this screenshot I went over 35 hours with 8% life remaining.
[T-Mobile Samsung Galaxy S II SGH-T989] xorudyxo:
Best battery time..

Post your best battery times :D

Stock, un-rooted.
[T-Mobile Samsung Galaxy S II SGH-T989] iLeopard:
That post shows little to nothing, how long was the display actually on? How about the rest of the apps, whats the usage time?

Here are mine, Juggernaut 4.1 with darkside's kernel. Full brightness.
[T-Mobile Samsung Galaxy S II SGH-T989] Hekademos:
juggernaut 3.x w/ bullet 2.9
[T-Mobile Samsung Galaxy S II SGH-T989] flipq88:
Here's mine, jugs 4.1 with bullet

Sent from Flip's SGS2
[T-Mobile Samsung Galaxy S II SGH-T989] Teo032:
Yep op should include display on time and other crucial factors.

Mine can be found here, xdaforums.com/showpost.php?p=21919081&postcount=1384
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
5 hours, 1% drop

this long line represents a 5 hour period where i was sleeping, with cell standby ON. during that time it dropped 1% from 34% to 33%. battery widget showed the same thing. personally i think battery % is just inaccurate sometimes, but still kinda cool to look at. this is with faux kernel and stock rom.
[T-Mobile Samsung Galaxy S II SGH-T989] grenademasta:
I am using the Galaxy Nexus Extended 2100mah battery that fits perfectly in my phone. I am on stock rom with faux's latest #009 mainline kernel. I uninstalled most bloatware and froze the rest. I am also using Advanced Task Killer Pro as well.

This screenshot was taken with the battery at 2% and my phone died about 15 mins later.
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
i did more testing and found some interesting things. i'm using the nexus battery, which i really recommend for $25, but standard battery will have similar results. i always run cell standby, it has to at least function as a phone. i'm also using battery monitor widget pro, which explains stuff much better than the standard graph.

in this pic you can see the battery start to drain only 1% for every 2 hours. for some reason it usually takes a couple hours to get to that point, and it's not consistent. but the amazing thing is, if i was able to keep the phone in this state, dropping 13% over 21 hours, it's estimated the battery will last for 6 days 22 hours. this is not using airplane mode. if i were able to maintain this 1% drop every 2 hours as soon as the display went off, it would easily be 7+ days.

this shows what happens during the 2 hour drop. the battery drain goes down to -11mA. sometimes it will get quirky and shows -2mA or -1mA, i tend to ignore those numbers. around -11mA seems to be the goal to shoot for.

sometimes numbers don't calculate properly. for example, in this i switched on airplane mode for a few hours before charging it up. in airplane mode it magically gained a few points of battery life! i think that's what causes the log to show things like -2mA sometimes.

btw these things aren't due to the app. the standard battery graph shows the same thing.

-kife
[T-Mobile Samsung Galaxy S II SGH-T989] Khizar:
Good tips.. Bump
[T-Mobile Samsung Galaxy S II SGH-T989] bchon:
Also turning off the sensors on our phones helps somewhat with excessive battery drainage.

Sent from my SGH-T989
[T-Mobile Samsung Galaxy S II SGH-T989] EpicPie:
Just using 2x Battery and BeastMOD 4.3 I get pretty good battery life with moderate use.

Sent from my SGH-T989 via Satanic Unicorns.
[T-Mobile Samsung Galaxy S II SGH-T989] mayonaise:
I've been trying out Lama, but so far I've run into a major problem. I have actions setup so that when the phone connects to my home or work wireless networks, Lama will turn of mobile data. But when this occurs, I can't get any data over wifi. Typically I need to manually disable wifi, then re-enable it and allow it connect in order to get wifi working.

However today, nothing is working. I need to uninstall Lama, because this is very disruptive.

update: after uninstalling Lama, things are back to normal. I enabled wifi, and went into the settings to disable mobile data (Settings > Wireless and network > Mobile network settings > Use packet data), and my wifi is working just fine now. So I'm pretty sure this is not a problem with my wireless network.
[T-Mobile Samsung Galaxy S II SGH-T989] slice2011:
With the llama setup as outlined by the op do we leave Wifi on all the time?
[T-Mobile Samsung Galaxy S II SGH-T989] NCRoadster:
I just got my GS2 yesterday.

The first thing I did was root, then install faux's 10m kernel.

I pretty much used it non stop last night and am very happy with my first discharge.

This was 30% 4G, rest on wifi. Usage included Facebook, tapatalk, Google reader, browser and installing quite a few apps.

CPU is at ~300-1720MHz.

I can't post pics yet, but I got 5 hours of screen on time. =-O

Really happy with that.
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
day 4

this graph shows battery life going into the morning of day 4. yes that's right, 4 days. i can't even zoom out enough to fit it entirely on the screen. this is using the stock rom, with my own customizations. you don't need a fancy schmancy custom rom.

medium usage. played mp3s for few hours, taking phone calls, nethack, email, facebook, some video, brightness 100% when outside, wifi on.

the yellow ticks at the bottom show how many times i was turning on the screen each day, and when i was sleeping.

i apologize if screenshot is not showing up, but apparently the forum won't let me make pictures public. =/
[T-Mobile Samsung Galaxy S II SGH-T989] mdlamotte:
Battery

Good to here, mine gets deliverd today!
[T-Mobile Samsung Galaxy S II SGH-T989] bchon:
I disabled/froze all of the stock widgets and it seems to have improved battery life somewhat. Boot time is definitely faster.

You can only freeze so many widgets with TB so use an app called Autostarts to disable the remaining ones in the widget list. Best dollar ive spent so far.. :P

Sent from my SGH-T989
[T-Mobile Samsung Galaxy S II SGH-T989] narlynarwhal:
I'm running Juggernaut 5.0 with Faux's 010u kernel and I'm lucky to get 2.5 hours of screen on 100% brightness. I play a few games like words with friends and draw something. Is this normal? Because I feel like it could be a ton better.
[T-Mobile Samsung Galaxy S II SGH-T989] gear79:
100% brightness for sure will kill your battery. I'm running SlickMod Supreme and my brightness is 0% and heavy usage from 8am til 10pm off and on and get between 15-17 hours of battery.
[T-Mobile Samsung Galaxy S II SGH-T989] narlynarwhal:
Would you say SlickMod Supreme is the best with battery life? I'm looking for a set up that will allow me to play games like Asphalt 6 Adrenaline for a few hours on a single charge.
[T-Mobile Samsung Galaxy S II SGH-T989] nikmel420:
I can't believe I'm asking this but what button is the lock button? I've tried hitting home and every other button. and no screen shot. I'm on juggernaut 5 ROM Hercules kernel if it matters

---------- Post added at 04:30 PM ---------- Previous post was at 04:24 PM ----------

(Or you can tap both the home button and lock button at the same time, built in Samsung feature that saves to your gallery!)

i can't believe I'm asking this but what button is the lock button? I've tried hitting home and every other button. and no screen shot. I'm on juggernaut 5 ROM Hercules kernel if it matters
[T-Mobile Samsung Galaxy S II SGH-T989] narlynarwhal:
I flashed SlickMod and the battery life is good, but there is a lot of lag.
[T-Mobile Samsung Galaxy S II SGH-T989] Scoutamis:
Is dropping 30% every half hour with somewhat heavy usage good?
[T-Mobile Samsung Galaxy S II SGH-T989] zalgon26:
Data off, with Juice Defender "balanced" profile

My story: it's pretty clear that background syncing and 4G data is what is taking out the battery. Getting those under control has tripled my battery life.

I was really, really disappointed with the battery life but this thread convinced me to try a few things. I'm running the un-rooted stock Telus build with a recent factory reset.

1. Battery conditioned a few times now (running down to zero, charging with AC adapter, running down to zero...)

2. Uninstalled all my background-sync apps

3. Installed JuiceDefender Ultimate and running on Balanced.

Only 10.75 hours in so far, but down to 70% battery remaining. Only gmail is syncing, everything else is on demand. That translates (assuming linear depletion of the battery) to around 35 hours, with a fair bit of emailing and web browsing. Display on so far for 1h44min (32% of total), with Android OS and Android System a distant second at 12% and 9% respectively.

Update:

Now at 21 hours with 34% remaining, it looks like I'll be able to get over 30 hours out of the phone without any real impact on how I use it. Total screen on time is at 3h20min. I am pleased! :D
[T-Mobile Samsung Galaxy S II SGH-T989] mayonaise:
Using Beast MOD 5.0. It's been a lot better than stock for battery life so far, but yesterday the battery drained itself in just over 9 hours. I was using the phone lightly throughout the whole day: I checked e-mail once or twice, checked the weather, launched the Google Finance app, looked at a map. Otherwise, not much else. I noticed "Cell standby" on the top of the battery history list. I've never seen that one take up so much juice before, and I didn't make any calls. Anyone know what this is about?

I took this screenshot a little more than an hour after I plugged it in. The stats are the same as before I plugged it in...
[T-Mobile Samsung Galaxy S II SGH-T989] gear79:
I am a heavy user from 6am til 9pm, off and on all day. I have had my share of ROMs so far. The SlickMod is good, but I usually test ROMs for a week and then move on. Juggernaut was good to me, working on Malice next.
[T-Mobile Samsung Galaxy S II SGH-T989] saru4:
2.3.6->4.0.3 battery drain, is there a mod fix?

Hi all,

This is my 1st post, sorry if my problem has been addressed. I can't find the exact thread.

Anyway, I've got a Samsung Galaxy SII GT-I900

About 2 months ago I did a Samsung upgrade from 2.3.6 to 4.0.3(ICS).

I instantly noticed the battery being drained that wasn't happening in 2.3.6.

So after googling I found work arounds that suggestd using apps like Juice Defender. So I have been using JD as a workaround.

But , now that I have rooted my phone and have CWM 3.15 installed I was hoping you guys might be able to point me to a mod upgrade to 4.?? (ICS) that has solved this problem. Don't know if its a true statment, but one artcle described my exact problem as "...the Suspend process has a bug and when it shuts off the WiFi radio it goes into an infinite loop of some sort that burns processor cycles and uses a lot of power. This shows up on the battery usage screen as "Android OS". By telling the operating system to never put the WiFi to sleep, the buggy Suspend process never runs..."

If there is no known mod/ROM fix in ICS? I'd even go back to Gingerbread which didn't have the bug. However I would prefer a pristine CWM of choice (Standard OS) over a restore factory default.

Can anyone assist and point me to a correct fix?

thanks heaps

SARU4
[T-Mobile Samsung Galaxy S II SGH-T989] alphadog32:
This is the wrong forum. This is only for T989/Skyrocket.
[T-Mobile Samsung Galaxy S II SGH-T989] DaveT5M:
now at page 38, started at p1...

So far, I would like to thank'd everybody for this thread ! So far, I've tweaked my setting as good as I could with the advices givin (up to p.38 as my reading is ) that in low to moderate usage of the phone I past from 10-12h to 1d 1h 40mins on battery life !!! So which means on heavier usage, I can expect to go higher than the 7-8hours I was extracting out of my battery which is really good news for my needs !!

Here is where I'm at as of Aug. 4 2012

T989D stock

Telus ICS

Llama setted as tips in this thread + event to disable mobile data while screen off

k9 mail syncing my 2 emails account every 30 mins

Facebook and tapatalk notifications are on

home wifi 99% of the time

Wifi always looking for wifi spot so I can use it instead of 4G

Screen display in 35-40% and manually adjusted when outside

no battery saver apps

no Juice defender ( not yet, wanted to test those setting first )
[T-Mobile Samsung Galaxy S II SGH-T989] jstodda:
Had INCREDIBLE battery on Darkside.. I gotvrid of gmail and loaded all emails through to stock email client. I get PUSHED email from work (T-Mobile) so the Gmail all in one app helps CPU sleeper, and a few other things REALLY REALLY help but the top 3 are using juice defender to toggle data/wifi only when screen comes on , and then every thirty mins otherwise for email updates. Sync is manually done once a day other wise off, also in settings, developer, I kill tasks as you backout which reduces random programs lagging behind. Especially coming from Blackberry I have been VERY VERY impressed with a full day or more from my Anker batteries using this setup, but not sacrificing function in any way.
[T-Mobile Samsung Galaxy S II SGH-T989] ArcticFish:
That battery life O_o

Sent from my SGH-T989 with Cyanogenmod 9 Nightly Power.
[T-Mobile Samsung Galaxy S II SGH-T989] DaveT5M:
same settings

this is today, not my better since last time but still not a too bad one ! Pretty pleased of the available hours increased since before I started to read and give a try to the tips in this awesome thread !
[T-Mobile Samsung Galaxy S II SGH-T989] DaveT5M:
Same Llama setting

SetCPU with few tweeks ( can list for those interested )

On Infamous 3.1 with no other modified kernel, radio...

Long flat portion was on plane mode since up here, north of 57th parallel it's hard to have a good signal and fairly good 3g network

sent from an Infamous'd T989
[T-Mobile Samsung Galaxy S II SGH-T989] xianzai2000:
[Q] Battery drains so fast !!

I got mine yesterday. Charged fully, and started playing with it.

But the battery drained so fast, like 20% or more per hour with moderate use.

I didn't play games or sync any accounts.

Every review says the battery is not so bad.

Is this defective?
[T-Mobile Samsung Galaxy S II SGH-T989] dungtran88:
You might want to consider an exchange if you buy from a local store. I bought mine, take it home and put the battery in and charge it for 5hrs then unplug. I use it a lot. I would say more than moderate but my battery was able to last up to 18hrs with 14% left.
[T-Mobile Samsung Galaxy S II SGH-T989] samomamo:
6 hours

6
[T-Mobile Samsung Galaxy S II SGH-T989] oilfighter:
Download a CPU monitor app, a program must have gotten stuck at 100% CPU, or your GPS is actively running.
[T-Mobile Samsung Galaxy S II SGH-T989] quest4fire:
You need to condition battery. Run it down fully til nothing left then recharge fully and repeat again one more time.
[T-Mobile Samsung Galaxy S II SGH-T989] Jorge18:
Mine is incredible with battery life. I'm shocked at the fact. With such a huge screen, I though it would drain really fast. But it hasn't been the case thus far.
[T-Mobile Samsung Galaxy S II SGH-T989] Jjday7:
1+ It take a few charges before the battery will run at it's peak. Mine ran down pretty quick too but that was the original charge out the box. Much better today. Give it three to four days.
[T-Mobile Samsung Galaxy S II SGH-T989] $pitacular1:
Yesterday I got 13 hours out of my device before having to charge it again.

I don't think I need to worry much about battery life with this phone
[T-Mobile Samsung Galaxy S II SGH-T989] AmbroseAI:
I had the same problem yesterday. Charged using a car charger to 100%, then it stayed there the rest of the day until I got the low battery warning! It jumped from 100% to 14% indicated. I rebooted and charged with the wall charger overnight, and now my indications show a normal discharge rate. I'll keep monitoring the situation, though. Don't know if the charging method has any effect, or if it was just coincidental.
[T-Mobile Samsung Galaxy S II SGH-T989] grabiarz:
Keep in mind I do have JuiceDefender running.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
This is a good thread. Whatever comes of this we can merge later with the battery info thread. I'm having the same issue and monitoring the drain and CPU useage, as well as trying to figure out if any installed apps are causing this.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
Excellent! I'm glad to see this thread is working correctly. Members posting what they're getting for battery life so others can tweak theirs as well. Good stuff :D
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
I actually was at ~50% this morning, got in the car and charged it on the way to work to around 70%. Then after unplugging checked battery useage monitor and it didn't reset at all (the timer)!
[T-Mobile Samsung Galaxy S II SGH-T989] umchriswho:
battery life sucks or defective...

the first day i got it, after i was done playing with it i decided to download all my apps and then charge the phone for the rest of the night.

didnt happen... i couldnt help myself to stay away from it. after 100%, i played with it for 4 hours. checked the battery life and the percentage remained at 100%. so long iphone, this battery life was amazing or so i thought...

after those 4 hours i just left it uncharged during that night since it was still at 100%. the next morning i decided to restart my phone and BAM 25% while i was in my car towards school. i QQ'd. was this a glitch?

NOW the next day, i charged to phone to 100% and unplugged the phone because i didnt want the phone to "overcharge." i just woke up to see this baby at 70%... and i didnt even do anything to it...

i hope this is a defective phone. im new to android but if this is how the battery life is... my wait for this phone was totally not worth it.

based off all the settings, i tried to disable as many things as i could too like the GPS, the brightness at 10%, wifi off when not in use and etc and these settings were in effect before any of these battery nonsense happened.
[T-Mobile Samsung Galaxy S II SGH-T989] mziol:
This might help: http://xdaforums.com/showthread.php?t=1303216
[T-Mobile Samsung Galaxy S II SGH-T989] Heltic:
Maybe at night switch on power save feature, I just leave mine plugged in. I don't think you can over charge it.
[T-Mobile Samsung Galaxy S II SGH-T989] Heltic:
Thinking about, remove the battery, then hold the power Burton for 30 sec. Then reinsert your battery and turn on that may work, I use to have to do that every so often with my sg4g
[T-Mobile Samsung Galaxy S II SGH-T989] umchriswho:
probably going to give it one more day. thanks for the links but it doesnt really help my situation. instead its just supporting the assumption that i may have a defective one... which im hoping so i could hurry up and exchange it so i could be all happy again like a little kid in a candy store

cmon 100% and i leave it for the night basically in idle state and i wake up to see 70%... thats horrible.
[T-Mobile Samsung Galaxy S II SGH-T989] paprcut:
Here are a couple of things that really helped my battery life:

Turn off TMobile's contact sync

- Menu -> Settings -> Accounts and sync -> uncheck T-Mobile Contacts

Ensure mobile data is not active when connected to WiFi

- Install Llama (https://market.android.com/details?id=com.kebab.Llama&feature=search_result) and launch it

- Add an event called WiFi

-- Add condition: WiFi Connected (any network)

-- Add action: WiFi Sleep Policy (never sleep)

-- Add action: Toggle Mobile Data (off)

- Add another event called WiFi Disconnected

-- Add condition: WiFi Disconnected (any network)

-- Add action: WiFi Sleep Policy (sleeps when screen turns off)

-- Add action: Toggle Mobile Data (on)

Let me know if anyone has questions or other ideas on how to tweak these!
[T-Mobile Samsung Galaxy S II SGH-T989] grabiarz:
Nope that's normal if you have a ton of apps running in the background. I noticed just by merely limiting the amount of sync and apps I had installed on my vibrant I could get the battery usage in idle down from about 5-6%/hr to about 1-2%/hr. Good test to do is charge the phone fully don't set anything up, do factory reset and check how much power it used up. Now repeat the same process with everything you keep on the phone installed.