yashsingh1/xdaforums huggingface dataset:
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] confuzd:
Switching the Network mode saves battery

I've noticed that putting the phone on GSM/HSPA (Auto mode) as opposed to GSM/HSPA/LTE (Auto mode) more than doubles my battery life. If you don't need the LTE, don't have LTE in your area or even have a very weak LTE signal, this is definitely worth a try before Samsung (or even rom devs) implement proper LTE radio battery management.

After switching the modes, my skyrocket is currently at 68% battery after a medium-heavy usage of about 11 and a half hours. Before, it would barely even last 11 hours.

I haven't experimented with any radios besides KJ2. Also, I think my battery drain may be connected with having a constant weak signal (1 bar/-100dBm) at home and at school, combined with the power-hungry LTE radio and poor power management code.

EDIT: I'm on TPCv3 with Da_G's kernel v0.43 with the minimum clock at 192 MHz and the maximum clock at 1566 MHz and the default power scheme (ondemand)
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] dpos21:
Good call. I wasn't aware that you could do that. I will try it today. I think that it will be similar to my experience with just having Wifi turned on but should help when not in Wifi range. I tested my battery last night with Wifi turned off and the drain was about 10% per hour.

Is anyone in the "I get great battery life" camp actually getting these numbers with only HSPA/LTE for data?
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] peoples_flip:
I'm currently rooted using the "Sky Ice Cream Sandwich" ROM and using Da_G's 0.42 kernel and get about 15~18 hours of battery live with "normal" usage.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
I've been getting some strange behavior lately in terms of battery. During the day (whether at work or when I'm out and about), the battery drain is very noticeable (5-10%/hour on light usage). But, at night when I'm at home, the battery drain is very manageable (about 1%/hour).

Do we know if WiFi signal strength plays a part? At home, I have very consistent Wifi. But, when I'm at work, Wifi is flaky. Even when it does connect, the speeds are very slow.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] appdroid:
What u running?
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] 00mred00:
Quickwiz with faux kernel
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] appdroid:
Here is mine with Sean's Ice cream sandwich and faux123's kernel.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
Stock, rooted.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] appdroid:
Try out stock rom you might get your issue fixed.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] rightwingrb:
Battery Life

I have had my Skyrocket for about two weeks now. Suffice it to say my battery life is not all that good. 100% charge when leaving the house at 7 am and by 10:30 I was at 33% with only light usage. The one thing that stands out is that my display always says that it is using 61-63% of my battery. I have seen other screen shots here in the forum that ranged anywhere from 25-34%. My screen has no active wallpapers, set to minimum brightness and times out in 30 seconds. I usually have to charge my phone twice during my work day. I am new to Android so I don't have a lot of experience with navigating the device but am learning. My iPhone 3gs that I just changed from gave me about 13 hours of moderate usage in a day before getting down to the 20-25% range on remaining battery. I hope someone out there will have some helpful words of wisdom for an Android Noob. :)
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] appdroid:
calibrate the battery it will surely do the trick for you.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
By stock rom, do you mean one of the stock'ish roms in the Android Development forums? Or do a hard reset?

I'm thinking of doing a hard reset. I have installed and uninstalled alot of apps since getting this phone (my first Android phone), so it could be any of those causing the problem.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] appdroid:
Yes stockish rom in dev forum.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] 00mred00:
Wifi connection and signal strength plays a huge factor.

It has been well documented in general with any phone that if you are connected to wifi with a good strong wifi signal it will greatly improve battery life.

The only exception to this has been a recent issue with skyrocket phones not sleeping when connected to wifi.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] dpos21:
Your display shouldn't be eating 60% if you have auto brightness turned off and set to the min

I've seen a lot of comments of people getting replacement phones with some success. First, try doing a factory reset. Charge the phone to 100%, then drain almost to zero then back to 100% etc. There are several posts on it to get the full process. You can wipe battery stats in recovery but that seems to be more for fixing the stuck on 100% issue.

You can also try flashing a new kernel. I'm using Sky Ice Cream Sandwich with Romracer kernel and my battery life is pretty decent now. But remember, the battery life on these phones, imo, is not that great unless you have a Wifi connection. The difference for me is 2-3% per hour with wifi and 10-11% per hour without wifi
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] 00mred00:
Woooo

Beat that

So those that have wiped battery stats in recovery....that permanently fixed the stuck issue?

I will add that into my tests tomorrow
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] pin2gtoes:
15% left after 12 hrs 47 mins

Not exactly sure what I did but my battery life has improved.

As far as I can remember, here's what happened today:

1. Charged battery to 100%, turned phone off, pulled battery, charged battery using wall charger for about 2 mins, re-placed battery in phone.

2. I also did a TI backup as I was preparing to flash a different rom. But after reading posts that users were still having battery issues with that rom, changed my mind.

I am more inclined that it was 1. that did something because I was always suspicious that my battery problem had something to do with %age display. Since 1. is one way to calibrate battery, it seems more connected.

Finally broke the <7 hours battey life :)
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] pilotwings1:
Im having the same problem, any idea's for fixing it. I got the phone last night let it die last night and charged it untill it was full and by noon today it was below 30 percent. no root all stock any ideas?
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Farrukh6797:
dear friends can u look at this

what can u say about it ,i think i have problem with my network and what should i do????:confused:
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Locoman_:
Why are almost all the replies here so subjective? "...my battery use is pretty good - it goes down some percent after a given time using it the way I usually do...".

I know everyone uses their phone differently but isn't there a subjective way of looking at this?

FWIW, I'm averaging 16 hours on a charge.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
What exactly do you mean by #1 ? You charged the battery outside of the phone ?

Well here is my experience. I cleaned up stock ROM disabled the not needed startup items, froze stuff and uninstalled not needed stuff....

The battery seems a bit better but I still dont think its good enough.

I did some tests over night, charged the battery to 100% and unplugged it before going to sleep.. When I woke up about 8 hours later the battery was down to 72%.

SO I did some more uninstalling and freezing for the next night test, closed all the background apps using the task manager (clear up the ram)... I did restart executive assistant, and I have mail not to pull off peak. I also turned off bluetooth, charged to 88% and unplugged it, woke up this morning to 43% battery.... Seems like a lot.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Farrukh6797:
mine cell standby using 80 % of battery, i dont know why, and my mobile phone everytime is hot , smth going wrong, and also have network problem
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] dogblood:
I seem to average 20+ hours per charge. I am using stock rogers - no rooted just the juice defender free app on the "Balancet" setting, I have 3 email accounts including my corporate exchange on push 24/7 (i get tons of emails). Love the battery life on this device.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
Are you getting this battery life on WiFi, HSPA+, or LTE?

On WiFi, if I don't use the phone, it drains about 1%/hour. On LTE, w/ the phone just sitting in my pocket, it drains about 7-9%/hour.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] ckck543:
Ya I am getting the same results as a lot of you guys. About 17 hours with about 3 hours screen on time running Juice defender Ultimate. This phone has amazing battery!
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
I dont know, maybe people dont have LTE or maybe barely use the phone, I installed Juice Defender and made lots of tweaks and still over night it looses over 25% and thru the day I might be able to get 9 hours with my "normal" use.... Watch movies ... Get in and out of train use for games. i`m really not sure how people get 17 hours maybe with just idle phone and phone calls and light email ? For normal use thru the day I have to charge it at least twice..

I really dont see it...
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] pin2gtoes:
Yes. That's exactly what I did. I also tried just turning off phone and lettiing it charge while it's off. It triggered me to try this because after I charge battery while phone is on, I noticed that battery meter drops to 99% immediately after unplugging charger.

I'm suspecting battery is not really getting recharged to it's fullest while phone is on. And charging battery outside of phone seems o support this hypothesis.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
What did you use to charge outside of the phone ?
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] pin2gtoes:
I used a generic battery charger from Amazon. It's PowerGen Rapid Smart Charger and I think I paid $12 for it.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Yze:
after rooting and freezing a bunch of stuff with titanium backup pro, i noticed a huge increase in my battery life.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
I can go about 18 hours on a charge. But about half of that is with wifi.. I always find that when I am out and about and am using HSPA+ the battery does drop significantly faster.

I switched from an iPhone, and the battery life on it was good. For me it was excellent because I had an app that would automatically revert to EDGE (uses much less battery than 3G or 4G) when the phone is locked. And when I unlock it, it automatically reverts to 3G (or in our phones case, potential HSPA+ or LTE). Is there any equivalent for Android? I've been searching around and can find similar apps but nothing that does it automatically based on locking the phone or not.

^An app like that would improve battery life greatly. Would potentially double standby time.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
+1 on this. This would be awesome!
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
Actually, it may be more difficult than I thought. I can't find any settings for disabling 4G/LTE/3G in my phone. Could be the ROM but I doubt it. If the settings aren't there.. then it could be much more complicated.

I don't have nearly enough experience with Android to think that I could attempt something like this.. unfortunately.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
Ok here is my latest test and I can upload the screenshot later. I`m getting to the last evaluation stages where I`m eather going to give up the iPhone and stay with Skyrocket or return back to the iPhone.

So yesterday, unplugged the phone in the AM mostly used it at home whole day, with WIFI. Played (very addictive) Little empire most of the day, of course very light txt/calls/emails. Connected to my car Bluetooth. some small videos, like youtube etc.... Some use on 3G not much. When battery was at 1% it showed 12+ usage... I guess its not bad, but for some reason I think it should be more... Will upload the screenshot of 1% later.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
I think AT&T took it out. Supposedly Rogers has it in theirs, but not AT&T. I also tried using the code *#*#4636#*#* to change the network type. And the setting wouldn't stick no matter what I did.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
The best that I've gotten is for the 4G icon to disappear. But in settings it still said I was connected to HSPA+... haha.

That's what I've heard as well, that on ATT you can't but on Rogers you can. So does this mean that on a Rogers ROM you can do it? I have a nandroid of a rogers rom from awhile back, I'll restore to it and see if it makes a difference... hopefully it's a software thing and not a hardware thing.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Creutzfeldt21:
If i adjust all of my setting right with setcpu I manage to get a good day of a decent amount of use at classes.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Swishaa:
Juice Defender. Look it up in the market. I can turn off your 3G/4G when you turn off your screen, based on location or at certain times of the day.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
I think he is looking for an app to switch down to edge and I think juice defender just fully turns off.data. I did see that paid version can do something like that but Im not sure.

JD turns of.data which is kind of bad since talk and and other services is what makes android stand out and with only every 15 min check it kind of sucks .... switching down to edge woukd be cool since ut can maint a connection.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] matt9023:
initially the battery life with my skyrocket wasnt so great, around 14 hrs on a charge.

I decided to delete some apps to see what it was. deleted facebook, Advanced task killers and some others. I think the culprit was advanced task killer for me.

Now i get around 15-16hrs with 20% battery left when i go to bed. This is with moderate use. That includes lots of texting and facebook, light web browsing, and about an hour of music through bluetooth. I'm pretty happy with it now.

Anyways some might try deleting any third party task killers and see what happens. Hope that helps.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Swishaa:
You can choose apps the you want to let turn on your data every 15,30,45 mins etc..
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
I checked it out and it's cool but not what I meant at all. When it comes to texts I need a connection constantly. And I text a lot. Just switching to Edge instead of turning off the entire data thing would still be great for battery life..
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Locoman_:
Root and run a choice ROM.... you'll see it.

.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] eghoti1:
yea that's 2-3 with wifi and 10-11 without is right in line with mine on Sky ICS. I've think i've narrowed it down to it being a radio drain with data, but since I have wifi access most of the day, I can get the phone to last a full day which is nice.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Zinger17:
Ive tried everything i still get the shiitiest battery life ever...Im on Rogers....

I flashed Sky Ice Cream, I flashed faux123's kernal....still crap

turned off LTE, pot screen brightness to 0....still crap

i deleted apps and widgets....still crap

i calibrated my battery 3 times....stilll crap

i just did a factory reset...and wiped my battery stats, wiped dvik cache, etc.

How do you do a clean install? this is my last step in tryimg to get better battery life...

basically, by noon im at 30% with light use.

will re-flashing my rom and kernel help?
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
This is about my battery life on a rooted stock rom/kernel. I haven't tried flashing a custom rom or kernel yet.

So maybe the last option is using a 3G/LTE toggle if you know you're gonna be away from WiFi the whole day? I think alot of custom roms have these (none work w/ the stock rom as far as I'm aware).
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] fongz27:
I've just learned to keep a charger at work and use USB charger when at home.... I do a lot of 4g data surfing at work :)
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] ckang008:
Try using this QCell SkyRocket Extended Battery. You can find on Amazon

With stock battery when i keep tether on, I can't last more than 6 hours. Now I can last full day without charge
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] helio2k:
Had the same problem and did full restore and now everything is working like is should

since this morning 6:00 AM till Now 16:40 still 72% Battery left push email and light internet once 45 min Video and still going strong.

Cheers.

Helio2k
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] sk8erwitskil:
i just got mine. Im waiting for my 3850mAh battery to come in then i will report back with stats
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] SKyRocKeting727:
When going to sleep and leaving the phone on standby, exit the applications running in the background and leave wifi on so that it's constantly searching for 4G LTE. Make sure if you have widgets running, like weather app, go to settings and turn auto refresh to none, auto scrolling to none. If using the standard E-mail app, go to account settings and on Email check frequency *SELECT* once a day or 4 hours unless you necessarily have to be notify of incoming emails all day. Make sure to go into market place app and go to settings, DESELECT auto-update apps. If not using much often, turn off Screen Rotator and GPS. Those are just some things that can help a little to battery consumption.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] differense:
On Rogers in Vancouver, so the LTE connection is fairly good in the Downtown core where I am during working hours. However, once I move away from DT, I start getting spotty LTE signals. This is when my battery life gets sketchy.

On HPSA only, I can last until the end of the day with heavy usage (email and calendar syncing). I'm usually at 60% by mid day, and 20% at the end of the day (around 11pm).

Coles notes: be wary of when you use your LTE until coverage improves in your area.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] benaranguren:
[howto] force edge connection

Not sure if this has been posted already but I've been testing one way I found to force 2g mode.

ROM: CM7

NETWORK: AT&T

CM7 has an option in 'Mobile network settings' called 'Use only 2g networks'. But everytime it's selected, nothing happens except it now becomes blocked.

However,

1. go to 'Network operators',

2. select the first of the 3 AT&T networks after scanning (YMMV), then

3. try enabling 2g only mode.

This time it will work and you can use speedtest to confirm how slow connection is.

As been stated before, a spotty LTE coverage, drains battery faster. I believe it's because modem keeps switching modes thus consuming precious juice.

I'll test how much longer battery lasts tomorrow.

HSPA only mode is also partially working. Meaning, it still throttled up to hspa+ momentarily then it dropped down back to HSPA. To try this out, a special APN ia required along with 1. and 2. above.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
Ah, so I guess it's just something you have to implement with the ROM. I wish I knew how to mess around with that stuff so that I could make something that you would just flash and it could bring up those settings :P

EDIT:

Since I'm so obsessed with this I'm going to start trying to learn how to make ROMs and whatnot.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] benaranguren:
Looking a lot better already.

Too bad I can't attach screenshot. After 6 hours 7 mins, battery is still at 68% capacity.

This is with mostly edge connection. HSPA only test will start tomorrow.

---------- Post added at 12:50 PM ---------- Previous post was at 12:44 PM ----------

I wish I could compile from source, too. But after failing several times to fetch cm7 code I gave up (for now).

I have never tried a different ROM at all but maybe the same option exists. If not, just flash cm7. That's what I did.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
Well, during my classes today I worked out how to extract a ROM so that you could mess with it (such as deleting the stock APKs). So maybe if I extract the CM7 ROM and poke around I can find whatever it is they did to make those settings show up.

I'm looking around my current ROM (One of those NEXUSMOD ones or whatever) and can't find anything to deal with data connection types..
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
I did a factory reset a couple days ago, and so far the results have been great for me, too.

Attached are my results after a couple days. At the point in the screen shot, I have 6% battery left. The results are with Wifi on for half of the day (though my work Wifi is very spotty), and light usage (some emails, IMs, and various apps).

Before the reset, the battery would normally run down 1%/hour when I went to sleep, leaving the phone on WiFi. Over the past couple weeks, I noticed it crept up to about 2-3%/hour. So, I did the reset; charged to full, and used battery calibration app (on the market). Two nights in a row, with between 6-7 hours of sleep, the battery only ran down 2-3% TOTAL!

Will need more time to judge its performance on LTE, spotty reception, heavier usage, etc. So far, I'm quite impressed.

I'm running stock rom/kernel and rooted btw.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] yozh:
Over night was WIFI on ? Emails ? Thats incredible ? Are you on Stock ROM 2.3.5/6 ? ? After reset have you installed/removed any apps ? I would like to get to that battery, best I had over night is 30% drop over 6-7 hours.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] jedah:
WiFi was on; bluetooth and gps off.

I don't have email set up. But, I have two gmail accounts synced set to receive messages as they arrive. Stock 2.3.6, but rooted.

I used Titanium to restore my apps. Nothing crazy. The only 3rd party apps that run while I'm sleeping are: Whatsapp, Kik, Touchpal, Go Keyboard, NoLED, ADW, ScoreCenter, and Facebook.

I also freezed some bloatware if I knew for sure I wouldn't need it: AT&T Navigator, Digital Clock, and TetheringManager
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] whosgotlag:
Reading through this thread it's plainly apparent to me I need to go talk to AT&T about getting me a new battery. Mine barely lasts 10 hours.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] M0D1441:
TelephonyProvider.apk is the apk that controls the band modes
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] MPurr:
I get 10 hours on a hard use day. I would deff take it in.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] greyhulk:
I was getting pretty horrendous battery life on my first day with this phone. I uninstalled Go Launcher and Go Locker and now I'm losing about 2%/hour (vs 7-8% before).

Not sure why I keep making that mistake. I have had the same issue in the past with custom launchers and I keep going right back and doing it again.
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
I'll check it out! Thanks for the tip Haha

:):cool::eek:
[AT&T Samsung Galaxy S II Skyrocket SGH-I727] Shadeslayers:
Alright, so over the past day I've figured out how to decompile APKs for editting, and how to recompile, sign them (if they are not system) and install and whatnot. Looking through the telephony apk I still can't seem to figure out how to enable the option... I'm gonna keep looking though.

EDIT: I'm guessing it has something to do with the .smali files. But I can't really interpret them so.. guess I'm stuck until I can find something from more googling.