yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy S II SGH-T989] BIGWORM:
Can I be safe to assume that using automatic brightness would eat more battery than usual? I'm on the latest DaBomb w/Bullet @ 1.2GHz max with ondemand governor...
[T-Mobile Samsung Galaxy S II SGH-T989] sl___:
Yes. Using autobrightness would use more battery since it needs to check regularly.
[T-Mobile Samsung Galaxy S II SGH-T989] :
I'm going to be honest until our screens get better calibration I don't think darker applications or black backgrounds are going to change the battery life. I am a power user. So my phone usually last me about 10- 12 hrs at most. Black background applications haven't change my battery life for even by 10 minutes. Even at the lowest possible brightness my display still takes up 50% of my battery.
[T-Mobile Samsung Galaxy S II SGH-T989] yeeluvspizza:
I have a rooted SGS2 SGH-T989 and recently got Bombaridier ROM and Juice Defender Ultimate only to get disappointing battery results that were worse than my stock ROM battery results, which BTW wasn't bad to begin with(36+ hours lite usage w/no JDU). Fully charged, it would drop 3% to 4% the first hour on standby. It would be down to 70% to 75% after 6 to 7 hours on very lite usage, eventually squeezing out 24 hours on one charge(sigh). After several attempts with different settings and configurations with no noticeable improvement, I just reinstalled the stock ROM and went with JDU set on extreme. I was at 98% after 3.5 hours, 95% after 8 hours, and now I see it at 85% after 16 hours....I am hoping I can get 48 hours. I will keep the stock ROM for now and look into getting C7 ROM this week, which just recently came out(still in beta).
[T-Mobile Samsung Galaxy S II SGH-T989] mettleh3d:
You didn't mention calibrating in there at all. Try that once and report back.

Download battery calibration from market and follow instructions in the app.

Eveyone whose used bomb seemed to have unparalleled battery and since your stock experience was good (mine was awful, 6 hours to dead) sounds like somethings up.
[T-Mobile Samsung Galaxy S II SGH-T989] yeeluvspizza:
Battery calibration was done when I was using bomb so not sure what was up. I don't think I will miss using bomb anyway since battery life on stock appears to be the best I've seen....right now on stock and JDU(extreme) I'm at 64% after 28 hours, which is pretty sweet. The biggest impact has to be turning off the 4g data when screen is off, which was never done before with stock. 48 hours seems very possible now. Fun experiment.:)
[T-Mobile Samsung Galaxy S II SGH-T989] Mrcojocaru:
Battery life question

I have been running Juggernauts latest rom and the latest bullet kernel. I've seen a lot of people say they're getting 2 days with heavy use... I cant though. If im moderate with internet use.. no games or movies, i can get it to last about a day or so. Could i have a defective battery or something? I switched to juggernaut because I heard battery life is amazing, but I'm not noticing much of a difference from beastmod 4.0
[T-Mobile Samsung Galaxy S II SGH-T989] dungtran88:
BeastMOD II 4.0 with Faux123 006b kernel work best for me. Battery life seem to be more superior than Juggernauts. I'm a heavy user and I do delivery so I use GPS a lot but I still have some juice left at the end of the day. (16-18hrs with about 15-20% left). I don't overclock though. I set my min(384)-max(1566) and UV to -75.
[T-Mobile Samsung Galaxy S II SGH-T989] Mrcojocaru:
Yeah I'm switching back.. Thx.. If I don't get better life with your setup I'm gonna take my phone to tmobile
[T-Mobile Samsung Galaxy S II SGH-T989] dungtran88:
I see lots of people undervolt their CPU up to -100 with no problem. try that and see if your phone can handle it. Unfortunately -75 is the lowest mine can go.
[T-Mobile Samsung Galaxy S II SGH-T989] Mrcojocaru:
I'm pretty new to rooting but I'll do research on changing voltage and I'll come back with results. Btw, are there any side effects to lowering voltage like the phone slowing down? Jw.. Sorry if stupid question
[T-Mobile Samsung Galaxy S II SGH-T989] dungtran88:
if you lower your voltage too much then you will experience lag,freeze,reboot. I would suggest try out -100 if it lag or freeze then -75, then -50, and -25 until it stable.

download this extract it out and copy the file to system/etc/init.d folder using Root Explorer. you can edit the file to change the voltage.

http://xdaforums.com/showpost.php?p=20280060&postcount=19
[T-Mobile Samsung Galaxy S II SGH-T989] yeeluvspizza:
Good news....I ended up getting 55 hours before it needed to recharge. Really nice to see the battery % barely change every time I picked up the phone.:cool:
[T-Mobile Samsung Galaxy S II SGH-T989] yeeluvspizza:
I think a great indicator is the battery's usage overnight when we sleep. If it's fully charged when you go to sleep and 8 or 9 hours later you still have 97% to 99%, that is a great sign that battery life will be optimal. But if you have 80% or worse even....something is wrong.
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
I would say this is only true if you have background data turned off. If you expect to get emails and app updates etc while you're asleep, expecting those things not to use the battery makes no sense.
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
My battery.... sucks... beastmod 4.0 and bullet 2.9 kernel
[T-Mobile Samsung Galaxy S II SGH-T989] hinghing1113:
I have a question on my battery drain.

Here's the some pic,

pic 1, at 2:41am, i stop using my phone and go to bed. it drew around 90ma.

on pic 2 and pic 3, at 9am it eventually drew less and less current to around 30ma.

so here the question.

between 2:41am to 9am, anyway to make the phone drew from 90ma to 30ma immediately? or why it take 6 hr to coming down?

I already make sure there is no backup syn on the background.

have setCPU, screen off at 192/192, disable 4g, wifi enable only

using BeastMod 4, synergy kernal.
[T-Mobile Samsung Galaxy S II SGH-T989] PJcastaldo:
Just curious how long it takes you guys to charge from dead to 100%. I am on Beastmod 4.0 w/ bullet Kernel. I recently noticed it takes a good 5 or so hours to reach 100% :eek:

any one else have this issue?
[T-Mobile Samsung Galaxy S II SGH-T989] yeeluvspizza:
Yes, I meant with data turned off....the phone should have 97% to 99% after 8 or 9 hours of non use. However even with data turned off an SGS2 with hardware issues, app issues or battery issues could end up with much less than 97% after 8 or 9 hours of non use, which has happened to a few people from what I've heard and read.
[T-Mobile Samsung Galaxy S II SGH-T989] :
Set cpu causes the processors to stay at maxed. That is the cause of the battery drain. It seems most overclock apps do this. I would use an init.d script. Keep in mind our processors are not exactly the same as smp cpus most overclock apps are programmed for smp cpus. Asmp is very different.
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
Hey I am also using beastmod 4 with bullet kernel and my battery drains fast when in sleep mode. What is an init.d script?
[T-Mobile Samsung Galaxy S II SGH-T989] :
First I would remove all cpu apps and reboot see if you get like anything around 10-15 hrs battery life. From a full charge. This is around average battery life.

Keep in mind area your in affects your battery life. Cell phone radios never stop scanning only time is wifi calling. A weak t-mobile area or any provider will take a lot more power than a strong one.

Init.d script to put in a simple term is a script that will run on boot. Which has the same affect as using cpu applications.

For example bullet runs at 1.67 ghz maxed.

To put it lower it would be

echo 1512000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

This will change will happen at boot.

The only things that I know work properly are overclock daemon, faux clock , and soon to be system tuner if it hasn't already updated yet.
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
What app gives you that info? I got spare parts?
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
Thanks for the info... I just flashed the rom and the kernel 2 days ago...
[T-Mobile Samsung Galaxy S II SGH-T989] hinghing1113:
it's battery monitor widget pro.

thanks, Killbynature

my cell phone signal is good at my home, always have full bar, so i don't think that's the problem.

i will try to uninstall the setCPU, that's the only cpu apps i install and see if the battery life increase.
[T-Mobile Samsung Galaxy S II SGH-T989] :
Also keep in mind not every phone is exactly the same. Just because I could run it fine. Doesn't mean your phone likes it. You need to find what works for your phone.
[T-Mobile Samsung Galaxy S II SGH-T989] EffnNice:
is it bad to charge my phone for the whole night it usually get down to like 4% when i need to sleep so i leave it for the night lol
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
I charge my phone the whole night also... my guess is it doesn't do anything bad... but that is just my guess
[T-Mobile Samsung Galaxy S II SGH-T989] ysuleman:
What is android OS... I went to sleep and about 4 hours later I woke I woke up and NY battery was at 50% from a 100% and another 4 hours later in idle it went to 15 percent.... any ideas?
[T-Mobile Samsung Galaxy S II SGH-T989] MMakoto:
Lately I've been having the same problem, where I unplug after charging 100%, then 6-7hrs later I wake up with only 69% left. I exited all active apps and clear the memory before going to sleep, and it just still kills my battery. This happens every other day and I just can't figure out what the problem is. Anybody else with the same symptoms and know of a fix for this? I am on 2.3.6 stock, rooted with odin and froze some bloats only.
[T-Mobile Samsung Galaxy S II SGH-T989] fraz82:
it shouldn't have any effect. New battery circuitry in phones for the last few years have been built to avoid "over-charging". once the battery is full the power is then rerouted to the phone, and not into the battery itself.

Also you should trickle charge your phone once every couple weeks to a month. which means, you let the phone go from 100 to 0% to the point that it shuts off on its own. Then fully charge to 100% but keep it plugged in for an hour after it gets to 100%. This full discharge cycle helps resettle the Li-Ion batteries a little bit, and keeps them working at full capacity. Of course this wont give a HUGE difference, but a significant one. The best way to condition your batteries is when they are new... most people have the urge to plug in their phones for a full charge the moment the open the box, but you should always let it empty completely before putting it on first charge. The elements still havent settled at that point, and the 0-100% first charge settles them perfectly as compared to a 40-100% charge first time around.
[T-Mobile Samsung Galaxy S II SGH-T989] kife42:
took this screenshot awhile back. battery was at 94%, so 6% drain. ideally this is something like what you want when you're waiting for phone calls.

stock rom, rooted.
[T-Mobile Samsung Galaxy S II SGH-T989] djxcee:
With very minimal use. Off course I have the gn extended battery.
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
Low usage, regular battery.
[T-Mobile Samsung Galaxy S II SGH-T989] knurdle:
I've been having the same issue. I'm 2.3.6 stock, rooted with odin and froze some bloat as well.

Every 2-3 days though, my phone will get into this mode where android OS will just push my cpu to about 10% vs when it's normally under 3%.

I've noticed that when I turn wifi on/off, it stops the drain.

I've tried rewiping the cache, dalvik cache and fixing permissions and hoping that fixes it. I've also tried freezing more of the apps that deal with wifi like wifi sharing. It hasn't happened in a few days so it looks like it's worked so far.
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
CM7 Alpha 2 with Synergy kernel... is this good? Seems like some people can get a ton of usage out of their device.
[T-Mobile Samsung Galaxy S II SGH-T989] gs2__:
battery calibration after rom

I just flashed Bombaridier v3.5 to my GS2. Is it wise to install the Battery Calibration app to further boost the battery life? Anyone done this? I'm afraid it'll mess up the data because the ROM already improved battery life before.
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
Just wipe it in the advanced menu of CWM. The advice I followed was to turn it off and charge it overnight while off, boot to CWM, wipe battery stats, turn it off and leave it a while, then boot, wait a couple minutes and pull the plug.
[T-Mobile Samsung Galaxy S II SGH-T989] knurdle:
So I've been having this problem where it seems randomly, my phone will start sucking down battery. Sometimes I won't see it for a few days, other times it'll happen twice a day.

I'm running system panel logging to see what it is when my battery is getting sucked down and it's always the android OS.

When everything is fine, it'll barely run and doesn't show any cpu usage. When it misbehaves, it'll shoot up to 10% cpu usage.

Normally, with my screen off, total cpu usage on the phone will be around 1-3%. When it misbehaves, it'll shoot up to 15% and be constant.

And you can just see the battery drain.

I've tried killing apps, I've frozen a bunch of stuff.

I'm running rooted stock 2.3.6. Just frozen apps.

I've noticed that the only thing that seems to reset the misbehaving is to turn off wifi for a few seconds and then turn it back on. Then the android OS will go back to a really low level.

So I did some googling and found these links.

http://www.keanei.eu/2011/06/02/and...-cpu-on-samsung-galaxy-s-running-gingerbread/

http://xdaforums.com/showthread.php?t=1039696

It seems like it's just some random thing that causes the android OS to go crazy and for whatever reason, turning wifi on/off will reset it on our phones.

As a workaround for now, I have a tasker job that turns wifi off/on every hour so if it's caught in this loop, at least it'll only drain for an hour. It sucks when it gets caught in this loop at night and I wake up to a phone that's dead.
[T-Mobile Samsung Galaxy S II SGH-T989] tweak.:
Check out my battery life...

Thats with fairly heavy usage yesterday (Google Music for hours, 10-16 phone calls) 50% brightness..

Juggernaut 4.1 and Bullet kernel.

Sent from your SGH-T989
[T-Mobile Samsung Galaxy S II SGH-T989] BIGWORM:
Extended battery?
[T-Mobile Samsung Galaxy S II SGH-T989] tweak.:
No sir. Standard battery.
[T-Mobile Samsung Galaxy S II SGH-T989] rickm8384:
Wow.

Can you give us all a little more insight into what exactly you are doing to achieve this battery life that can only be described as GODLIKE. Did you type in IDDQD or something like that???
[T-Mobile Samsung Galaxy S II SGH-T989] schoi623:
What is your trick? Are you using battery saving app? What are you cpu and voltage settings? The battery life you are getting is amazing.
[T-Mobile Samsung Galaxy S II SGH-T989] Temescal:
Here's a screenshot of mine. Juggernaut 4.1 ROM, SetCPU, and about 40% brightness. I've only been lightly using (email, texts, and a few apps like Evernote) it since my microSD card hasn't arrived yet and I haven't gotten a chance to load in all my music.

Edit: NVM I can't post the s/s :(

If the image doesn't show up:

20% battery

2d 8h 0m 28s
[T-Mobile Samsung Galaxy S II SGH-T989] maguin4:
amazing! please do share your exact setups and tips. thanks!

I get about 18 hours on a rooted stock ROM.
[T-Mobile Samsung Galaxy S II SGH-T989] Temescal:
Nothing too special.

Juggernaut 4.1 Bullet kernal

SetCPU: Max: 1674kHz, min: 1026kHz Performance scaling. Also have a screen off profile with stock setting.

Brightness about 40%

Power saving mode when batt lower than 30% (not sure if its working correctly as my gps and wireless are still on)
[T-Mobile Samsung Galaxy S II SGH-T989] grenademasta:
Nevermind the trick, wth is that llama on the top left of the screen?
[T-Mobile Samsung Galaxy S II SGH-T989] tweak.:
That Llama is part of the trick!

ROM: Juggernaut v. 4.1

Kernel: Cmenard's latest Bullet

SetCPU: ondemand 384mhz to 1.6GHz

As for the Llama:

There's really not much to it!

Although, I am now noticing the BEST battery (even though I've installed this ROM combo multiple times); this recent time I formatted /system, /cache/ and /data 3x each prior to install of Juggs.

Hope this helped.
[T-Mobile Samsung Galaxy S II SGH-T989] unlvmike:
Double post ...
[T-Mobile Samsung Galaxy S II SGH-T989] unlvmike:
Please define "fairly heavy usage". It doesnt look like the screen was on much, Wifi?

There is enough hate in the world. Why can't we all get along here ...?
[T-Mobile Samsung Galaxy S II SGH-T989] tweak.:
WiFi 65% of the time id say. 4G/3G the rest. Screen on most of the day... Browsing interwebs and texting. Google Music while driving. Took more calls yesterday than today.
[T-Mobile Samsung Galaxy S II SGH-T989] jriv:
I think my biggest problem is I love my screen on at 100%

Sent from a guy living in a van down by the river
[T-Mobile Samsung Galaxy S II SGH-T989] GBGamer:
Normal usage!

Sent From The Best Phone of 2011
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
Maybe I've never seen this because juice defender cycles my wifi on and off every half hour to sync my email.
[T-Mobile Samsung Galaxy S II SGH-T989] germania:
Every time I unplug my phone, my battery drains about 8% per hour. If I reboot my phone, it's fine until I charge and unplug it again. Basically what I do is plug it in when I go to bed, then when I get up in the morning I reboot it as soon as I unplug it and then it's fine for the day.
[T-Mobile Samsung Galaxy S II SGH-T989] knurdle:
So I've tried cycling my wifi and that doesn't seem to help. It's still happening. I'm trying all these different things to figure it out.

Now I'm thinking it might be an app that's triggering it. I'm trying to disable my apps one by one and see what happens.

I'm trying go locker first because it seems to happen when I lock the phone.
[T-Mobile Samsung Galaxy S II SGH-T989] thecalip:
I don't know how you guys manage to get this long. This phone drains 2% while it is sleeping. That mean, if I leave it sleep, it will die in 2 days without touch it.
[T-Mobile Samsung Galaxy S II SGH-T989] maguin4:
after rooting, stock ROM, running juice defender (free version) on extreme, screen on auto, wifi/GPS off... this is my typical result.
[T-Mobile Samsung Galaxy S II SGH-T989] Temescal:
What do you mean it drains 2% while sleeping? You mean it only drains 2% battery for one night ~8 hours while you are sleeping? If that's the case, that's pretty good.
[T-Mobile Samsung Galaxy S II SGH-T989] 07blackwater:
I think he means 2%/hour
[T-Mobile Samsung Galaxy S II SGH-T989] rickm8384:
I must have WiFi on at all times because at my home I get no service and at work I get very little. On average I get around 10 hours of battery life. I'm satisfied and also keep a spare battery charged at work for emergencies. anything I can do to get a little more juice? I also use lamma to make a rule for WiFi off while I am disconnected from it.(ie in the car driving) and also to keep WiFi from going to sleep when I am connected.
[T-Mobile Samsung Galaxy S II SGH-T989] Kross2:
I apologize if this has already been discussed but has anyone found a solution to the battery glitch problem where it just gets stuck at 100%? Its already been two weeks so its too late for me to return my phone so I'm curious if there's any other way to fix this other than rebooting.
[T-Mobile Samsung Galaxy S II SGH-T989] SoMuch2S@y:
The OTA update should've taken care of that, have you received the update yet?
[T-Mobile Samsung Galaxy S II SGH-T989] Kross2:
nvm updated to 2.6 and its fixed now :D
[T-Mobile Samsung Galaxy S II SGH-T989] bigburpsx3:
rom: juggernaut 4.1

kernel: bullet 2.9b

running GideonX's 384-918mhz -75 undervolting script

using Llama

yeaah buuddy
[T-Mobile Samsung Galaxy S II SGH-T989] Oreo13:
Hi everyone one posting this like crazy, and more than likely will get shame finger from the mods. lol Well, anyway I am using dewizzed 2.0 with the kernel that came with it. I would like to know peoples settings for the above rom. I only got 6 hours the first time I flashed this rom. With very light use as well.
[T-Mobile Samsung Galaxy S II SGH-T989] shinew:
what I've found to improve battery life and also improve performance is to root & debloat the ROM(if using Stock) or pick a custom ROM/Kernel, then use tasker or similar app to turn WIFI on/off based on location(using cell tower based to save battery).
[T-Mobile Samsung Galaxy S II SGH-T989] kid1da:
I'm trying to use the app llama with the settings from the op but my wifi still seems to be on with the screen off.

Nvm was able to fix it.
[T-Mobile Samsung Galaxy S II SGH-T989] div3r5ity:
i got my phone around x mas and put all the apps that i had on my HTC sensation and i was only getting about 10 hours out of the phone no matter what i did, so i tried a different oem batt since my boy works at tmobile and same result. i started to think it was my phone so i was contemplating on doing a hard reset but before i did i deleted 3 apps( weatherbug, circle batt widget and skype). then charged it fully . NOW im at 13hrs and im only at 60%. CRAZY!
[T-Mobile Samsung Galaxy S II SGH-T989] Rekzer:
Im getting some pretty varying battery life. Around 10 hours of light use, and the battery stats dont show anything except android system being around 40%

Faux 0.7u Juggernaut 4.1 Litening theme

I cant wait for my extended battery to get here, im wondering if Sync is the cause cause i got FB/Twitter/Evernote/all these other apps syncing

Ive heard that battery % mods can drain battery, is it possible the one in litening is eating my battery?
[T-Mobile Samsung Galaxy S II SGH-T989] OriginalMemnock:
Can't beat this battery life. Synergy kernel FTW!

Moderate to heavy use (lots of calls, streaming music, web surfing on 4G, texting):

Moderate use (some calling, web surfing on wifi, streaming music):

Note the battery life after 18 hours!

Rom: Mohkg v. 1

Kernel: Synergy v 0.10

Launcher: ADW EX

Lock Screen: MIUI Locker
[T-Mobile Samsung Galaxy S II SGH-T989] MMakoto:
now that is some impressive battery life there. i'm running jauggernaut 4.1 with the baked in kernel, can i flash only the synergy v.0.10 kernel?
[T-Mobile Samsung Galaxy S II SGH-T989] kvizz:
How are you guys getting such insane life!!!

Moderate to heavy web browsing at school. Did notice HSPA+ and 3G and EDGE kept switching and I kept going from no service to full bars.

Also, WiFi and data was always on. Brightness turned all the way down. That's bright enough!

Display was only 2hours and 20minutes. Right after the screen shot it powered off.

Flashed my stock 2.3.5 to juggernaut 4.1. That's all I did. Should I flash a kernel or something to make it better?
[T-Mobile Samsung Galaxy S II SGH-T989] div3r5ity:
its prob an app, try deleting one you think may be eating the battery, i was getting only 10 hours myself til i deleted one.