Develop Bugs

What sort of battery performance are people seeing?

So I've had my Defy a week and I like it, more than I thought I would to be honest.
However, one thing that's bugging me is the battery life.
In their review, Engadget actually highlighted the battery life as one of the big plus-points of the Defy.
They state:
Engadget said:
In our experience, the Defy seems to have stellar battery life, which is relatively hard to come by among Android phones. Not only we were able to consistently make it comfortably through an entire day on a charge, but we were surprised to find that after putting the phone away with about 75 percent charge, it was still on with 21 percent remaining two days later. Granted, it spent most of that time in WiFi calling range (which disables the cellular radio), but many smartphones give up the ghost from 100 percent charge in less time...
Click to expand...
Click to collapse
Now, I'm not using wi-fi calling but I don't think that should excuse or explain the fact that my phone barely lasts a day when at least one other handset has such significantly better battery life.
Anyway, I was just wondering how everyone else's Defys were performing.

Im coming from a vibrant and the battery on this is the best on android so far that i've ever used(g1, mytouch, mytouch 4, vibrant, etc.
Sent from my MB525 using XDA App

If you don't mind me asking though, how long do you go between charges?
As I said, I'm lucky if I make it much more than a day - certainly two days isn't possible.
But I'm not a particularly heavy user, a bit of internet and a few texts here and there but very little in the way of calls, so I kind of feel like I should be getting more out of the handset.
When I check the battery usage, it's quite often ~40% each for 'Mobile Standby' and 'Phone Idle'.
So the vast majority of the drain is just from the phone being on, not from anything I'm actively doing.

Is this your first smartphone? =)
I go a day and a half or so. I'm heavy on web use and playing 'slice it' all day.
for my usage, im THRILLED to have a phone that can still have 30-40% at the end of a long day.
Sent from my MB525 using XDA App

Just try to reboot the phone after fully charged and detached from power. There is an issue with the "suspend" process in some cases (not only on Froyo 2.2) which disappears after rebooting. Mine lasts 2-3 days with average use.
The issue at Google (I am not allowed to post links as a new user )
code.google.com/p/android/issues/detail?id=11126

I can use the web steady for 5 hours, this includes some streaming video, if I start at 100% its down to 10% by then. At work it lasts easily all day but it gets little web usage and maybe an hour of talking. I use battery booster and advanced task killer, my backlight is set at 70%.

With moderate use (some calls, lots of texts, some web browsing) I get 2 days. It needs to be charged at the end of day 2, but I'm happy with it. I don't have any ot the social networking crap on so it's not constantly syncing. I think that may have something to do with it. I keep my backlight way down too.

Battery life? i got defy just a week ago and first impressions are good. You know, in the first days you make yuor phone working a lot, testing all the features, trying new apps from the market (so internet connection always on) , watching some movies, playing 3d games!
So a really heavy use, but power lasts at least 1,5 days. So i think using the phone moderately makes the battery life easily up to 3 days.
Try some task-killer app, and then test the power duration. Some softwares stay in background and keep draining power.

disturkis4u said:
Is this your first smartphone? =)
Click to expand...
Click to collapse
No.
And I don't see what that's got to do with anything.
My battery life seems to be noticeably poorer than what the majority of people here are quoting.
If I were to use the web for 5 hours, there's no way I'd have anywhere near 30-40% of my battery left.
shaftenberg said:
Just try to reboot the phone after fully charged and detached from power. There is an issue with the "suspend" process in some cases (not only on Froyo 2.2) which disappears after rebooting. Mine lasts 2-3 days with average use.
Click to expand...
Click to collapse
Having looked at your link, it sounds as though when that's happening, people can see the Suspend process listed in the break-down of what's using the battery.
I've never seen it listed, so I'm not sure that's the problem here.
xdaid said:
Try some task-killer app, and then test the power duration. Some softwares stay in background and keep draining power.
Click to expand...
Click to collapse
I've got Spare Parts installed and it's set to 'aggressively' monitor and kill processes.
A friend recommended it over the likes of Advanced Task Killer because it's supposed to be better at differentiating between apps that are safe to kill and parts of the core software/system that could cause issues if closed.
I get what you're saying about using the phone more than normal because it's new but in the 8 days since I got it, I've spent 7 at work, so I haven't had that much scope to mess around with it.
I've switched the screen from automatic brightness control and I've disabled the background syncing for facebook, so hopefully that'll make a difference.
If not, since it's just over a week, I'm well inside the 28 days I can have it swapped for being faulty.

Quadrant: 1100 points, Linpack: 6,49 Mflops
Edit: ooops, should read the title more carefully next time.
My defy runs for about 40 hours on one battery charge.

i have to charge mine everyday at night after using it whole day, time to time. Not bad tbh.

A task killer is NOT necessary.
It seems like blur services are push rather than pull which uses much less battery (think blackberry). But im not 100%.
I've set up yahoo, corporate, facebook, and picasa just to test it out and it didn't make much difference in my battery life.
I consistently get a day and a half (unless i play games). Can push to 2 days if i put on airplane mode overnight.
Sent from my MB525 using XDA App

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Found this on a german forum, as you can see, he was not in flight mode. I guess my desire's battery won't last that long.

I can go about one full day with moderate/somewhat heavy usage. Won't last 2 full days though.

disturkis4u said:
A task killer is NOT necessary.
Click to expand...
Click to collapse
People keep saying that but I'm not convinced.
I mean, if I use my browser say and then finish using it and know I won't need it again for a while, why prevent me from actually closing/killing it?
It seems so ridiculously counter-intuitive.
Plus, if it's really not necessary, then why are so many of them being developed?
Even Samsung are producing task managers now for devices like the Galaxy Tab - if it really wasn't necessary, surely one of Google's top hardware partners would know that.

And samsung is so great at making stuff...? Touchwiz??
Also, samsung's task killer does not show inactive or background apps like most task killers do.
What is the harm in the browser being open? It uses no cpu+ this phone has more than enough ram that it doesn't need you to close apps to keep things running smoothly.
It also will not improve your battery if you arbitrarily close an app only to re-open it later and use more processes.
Just my 2 cents on this topic.
Sent from my DEFY using XDA app

disturkis4u said:
Touchwiz??
Click to expand...
Click to collapse
Blur?
They're no Sense, either of them, that's for certain.

Yeah they're nowhere near being that bloated lol
Step666 said:
Blur?
They're no Sense, either of them, that's for certain.
Click to expand...
Click to collapse
Sent from my DEFY using XDA app

Something i already posted in a german forum about my battery life:
2,5h gaming (Zenonia),
3h mobile internet (ICQ, Yahoo-mail, web, market)
2h of activated WLAN and deactivated sleep to copy stuff from pc to Defy
1,5h music (radio)
and 1h (and 6 minutes lol) of phone calls
After that day, i still had 30% of battery.
The maximum i reached were 75 hours including MY normal use with some mobile internet, some texting and 1 or 2 calls...maybe an hour of gaming at most.
I did not charge it first when i got it, because the battery was at 80% already/still and i wanted to play around.
Current running time: 26 hours...i activate plane-mode at night from now on. Low 70s now.
Everything at minimum display brightness (30%?)

Step666 said:
People keep saying that but I'm not convinced.
I mean, if I use my browser say and then finish using it and know I won't need it again for a while, why prevent me from actually closing/killing it?
It seems so ridiculously counter-intuitive.
Plus, if it's really not necessary, then why are so many of them being developed?
Even Samsung are producing task managers now for devices like the Galaxy Tab - if it really wasn't necessary, surely one of Google's top hardware partners would know that.
Click to expand...
Click to collapse
In my opinion, a task killer is absolutely necessary.
All the apps launched keep consuming RAM even if they're not in use. I brought back 106 mb last time i performed a task killing! In most of the cases less ram means worst performances / more work for cpu.

More Battery Testing on the SGS2, Stock batt VS Ankler

Hello forum and its inhabitats ! I have a new issue today (a new thread about it at least, the issue was here always); battery capacity and the SGS2 battery life ! My GS2 was sent with a 1650 chinise battery -- im not very happy with it. Using the phone quite passively leaves it with only 6 hours of battery life - i checked and it was roughly 20% per hour -.-
So i was browsing ebay and stubled on battery replacers for the GS2, one of them being a 2430 mAh capacity battery (http://item.mobileweb.ebay.de/viewitem?itemId=130594902895&index=14&nav=SEARCH&nid=15065655277).
So i wanted to ask, is it a fake ? Which battery should i buy to prolong my phone's life ? Thankyou for anwsers by time ^^
Sent from my GT-I9100 using XDA App

Oh and what i want is an extended battery without having to get a bigget case or anything. And, should i buy a 1650 again, just the japanese version ? Come on people i know you can anwser this
Sent from my GT-I9100 using XDA App

The Anker 1900mah battery (amazon.co.uk links: single battery, two batteries + charger) is probably the best extended battery which is the same size as stock (no bigger battery cover needed)

20% battery per hour is not normal with whatever "passive use" means. I would first investigate what's using up your juice before getting a new battery. Go into Settings -> About phone -> Battery use to see what's going on. Your phone might not be getting into deep sleep in which case BetterBatteryStats from the market might help you.

Vlad the Cat said:
So i wanted to ask, is it a fake ? Which battery should i buy to prolong my phone's life ?
Click to expand...
Click to collapse
Yes its fake, only buy original samsung batteries, samsung has a larger 2000mah battery if you want more capacity.

milestoner said:
20% battery per hour is not normal with whatever "passive use" means. I would first investigate what's using up your juice before getting a new battery. Go into Settings -> About phone -> Battery use to see what's going on. Your phone might not be getting into deep sleep in which case BetterBatteryStats from the market might help you.
Click to expand...
Click to collapse
Yeah, the screen usually eats 65% of the total battery. Where and what should i search in this betterbatterystats ? (downloaded it already).
And yeah, not quite passive use i'd say ^^
Sent from my GT-I9100 using XDA App

Well, if the device loses 20% per hour, its probably not going to sleep.
When looking at the battery stats (settings > about > battery), try to see if the device is awake a whole lot more than the screen is on.
If it does, with betterbatterystats you'll be able to see by going to "Partial wakelocks", whats the cause of it. if an app has a long wakelock time it is probably the issue for the battery troubles.
try to see if you have facebook sync, maybe its causing it as well.

eranyanay said:
Well, if the device loses 20% per hour, its probably not going to sleep.
When looking at the battery stats (settings > about > battery), try to see if the device is awake a whole lot more than the screen is on.
If it does, with betterbatterystats you'll be able to see by going to "Partial wakelocks", whats the cause of it. if an app has a long wakelock time it is probably the issue for the battery troubles.
try to see if you have facebook sync, maybe its causing it as well.
Click to expand...
Click to collapse
Im gonna run System Monitor today, to watch what apps used what and how much. Plus BetterBatteryStats at the end of the day. Lets see whats wrong with this phone <.<
Im also using Revolution ROM (2.7.1 i think..) with the CF-Root kernel. What i turned on by myself is: screen brightness minimum, sync of Gmail and Twitter (quite often, twitter every 5 minutes and Gmail i dont know how much. Constantly i think). Gtalk is always on, Mobile data is always on too, i do some browsing at times and some games too (at a higher screen brightness usually). AVG antivirus is always on, Latency is updating my position, Evernote large widget (the only widget im using, everything else is shortcuts). And thats it.
I know it may seem much but i still think it shouldnt be eating THAT much. Especially when its screen is off for 4-5-6 hours per day because of school.
Im also gonna post the apps that shouldnt be running in the background this evening (im from germany)
Sent from my GT-I9100 using XDA App

Ok so for now it taked 10% per hour with me not using it much. Lets see what stats i get at the end of the day. What exactly should i screenshot ? I got system monitor, BetterBatteryStats and the stock battery stats.
Sent from my GT-I9100 using XDA App

Eh.. I think i'll do the run tomorrow and post tomorrow's stats. Today my phone crashed once, and i turned it off once aswell, so i have a 30% gap in all monitors (from 70% to 40%) soo yeah.. Post your suggestions, people.
I'll test out this battery, and then fix some issues and test again, then do the same to the 1900 one higher in this thread to see the differences
[ GT-I9100 ] XDA APP SO TASTY WITH MY SLOW INTERNET OMNOMNOM

Today's results:
-unplugged this morning at 7:33 - 100%
-plugged in right now at 16:23 -5%
So roughly my battery lives ~9 hours per day. Why im still not happy ? Because im not using it the half of the day due to school, and when i do use it, the discharging is a bit overwhelming in my opinion.
Turns out it drains 11%/h or so.
I'll post the numerous screens from different applications, hoping that peoplr will help me improve the battery (since i know a lot of other people have their phone living for 20 hours !)
Also, you will notice the skip in the stock battery monitor and in the system panel app, its just how i said in my other thread - data loss. I was reinstalling chainfire so that the tegra game would work, and ofcourse the phone rebooted forcefully after installing/upgrading the CF3D plugin.
Stock monitor (approx. 1 hour of data was lost):
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SystemPanel app (1 hour of data lost like in the stock monitor):
Plus the running apps info from this app (im not sure which ones should run and which not, but i'll try to list any suspicious services), a whole list:
Odd: Those two Bluetooth services
None of the next ones should be running in the background in my opinion:
None of those eighter:
These too shouldnt be here ?
Samsung keypad i understand, but i didnt knew it always runs in the background. Others i dunno.
WTF Skype, i haven't opened you in weeks !
Those that are EX here i know they should be working.
XDA runs in the backgroud ? With otifications i guess yes, but i had none untill now and will turn it off. Also, system apps begin, and i wont comment on them
Except for this one maybe. I have my Latency location updating, so that explains the friends location
And finally the last screenshots from Battery snap app !:
[ GT-I9100 ] XDA APP SO TASTY WITH MY SLOW INTERNET OMNOMNOM
If i helped you im sure its easy to press that lil' pretty "Thanks" button

Sorry guys for the overload of screenshots. I dont have a pc now and wont have one soon eighter, so its hard to type and go back and forth to check every apps name, usage, cpu time ^^" plus this is another reason why i need my phone working at its max, life longerso i could use it normally, but not hold it on the charger constantly.
UPDATE: today my screen (when it was used) was at 20% brightness, and i deleted the twitter account, so no sync every 5 minutes (i still dunno about GMail, maybe its constant ?)
Also ! I dont think my screen really used just 48%, its usually more - around 60% ! And today i actually saw that it was 73% at some point but then it would fall down to 60 again due to idling (probably the data was lost. Again.)
[ GT-I9100 ] XDA APP SO TASTY WITH MY SLOW INTERNET OMNOMNOM
If i helped you im sure its easy to press that lil' pretty "Thanks" button

if you are looking for a new battery, the anker 1900mah is the best you can get without increasing the size of the phone! It is also the only third party battery that is proven to be the mah they claim it has, some even get 2000mah with this battery.
If i was you, i would first disable all your widgets, and then check again! If its a big difference, add them one by one slowely! Some widgets can cause battery drain. If that doesnt help you can try to reset your whole phone back to how you got it in the beginning and then slowely add your apps back.
you could also try and read this : http://forum.xda-developers.com/showthread.php?t=1135033

Just ordered one and a desktop charger
Sent from my GT-I9100 using Tapatalk

Seriousley, Running an AV!? LOL

TIPS for Improving Battery Life

Hey guys, so i've noticed that a lot of people are complaining about their battery lives. There are a few things that I have done which are not too complicated that I think the rest of you should do too (if you haven't done so already). With these steps, i have my brightness almost to the max the entire time, and the battery lasts me most of the day without needing to charge.
1) Calibrate your battery - This first step is a given, and should definitely be done, especially after rooting. You can find steps by searching in the forums for how to calibrate battery.
2) Uncheck "Use Wireless Networks" in the Locations menu in the settings. This is a huge battery hog, if not the biggest on the phone (next to brightness and 4G). If you feel like you need it to use the "Places" app better, then you can either always turn on GPS just when you need to use it, or just search for whatever you want in Google Maps directly. Many ways around this problem.
3) ROOTED USERS ONLY - Get a root explorer, go into /system/apps and move the following apps to a different folder, preferably on the sd card: Socialhub.apk, Mediahub.apk, Sprintzone.apk, SprintID.apk (sometimes called w_sprint.apk). Obviously if you use those apps, dont move them because you'll essentially be deleting them, but from my experience most people don't use them, and they are always just running in the background. Huge battery hogs as well.
- You can also delete the other sprint apps through the usual app removal process if you'd like.
Also, if you use widgets such as Beautiful Widgets, or Minimalistic Text, for time and weather that require Use Wireless Networks for updates, it would be best not to use them. Especially BW, drains a good portion of the battery. There are other alternatives that I feel are just as good, such as a decent looking modded stock digital clock and the genie widget from ICS (Thats what i personally use). They take a fraction of the others and provide the same information.

Very nice tips. I didn't really like media hub and got tired of seeing it.. but the sprint files you mentioned weren't in my folder.. The apps are still there
EDIT.. also can you like me to battery calibration instructions? O didn't even know that was a thing...
Sent from my SPH-D710 using xda premium

You can also freeze those apps if you are rooted. Same results

How do I go about doing that?
Sent from my SPH-D710 using xda premium

In the batch options, scroll down to freeze/thaw section
Dwayneiztheshyt said:
How do I go about doing that?
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse

xlGmanlx said:
In the batch options, scroll down to freeze/thaw section
Click to expand...
Click to collapse
In titanium backup.
Sent from my SPH-D710 using xda premium

I am always so surprised to read people with bad battery life. I have a stick phone running all sick items except having root and I well easily get well over a full day on my battery. I plug it in asst the end of the day with 60% battery on a regular and that is after 14-16 hours. GPS always on, brightness on auto, sync what needs to be synced, using the phone as a phone, with Bluetooth at times as well. The only time I lose significant power is when I use Netflix or start running games for an hour or so.
Are people running stock on this or a built ROM? Also, are you running stock kernel with CWM? CWM put my battery into a hole so I went back to stock without CWM, no idea why out would do it though.

Examples of battery life.
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jedwardmiller said:
Examples of battery life.View attachment 814656
View attachment 814658
Click to expand...
Click to collapse
It seems to me like from those pictures that you barely use your phone for other things than making calls. The reason that i can come to that conclusion is because your display battery usage is just so much less than your Android OS, that just means your screen is off for the majority of the day. I'm assuming from that that you're probably an older gentleman who has less use for things like texting and Facebook. Unfortunately, the majority of my communication is through those 2, as well as some other channels.
And to answer your other question, i am running stock rooted without cwm.
Sent from my SPH-D710 using xda premium

Dwayneiztheshyt said:
Very nice tips. I didn't really like media hub and got tired of seeing it.. but the sprint files you mentioned weren't in my folder.. The apps are still there
EDIT.. also can you like me to battery calibration instructions? O didn't even know that was a thing...
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
I guess i can just describe it for you, its pretty simple. Just follow the following steps:
1) charge your phone to 100% (if it reaches 100 unplug it then plug it back in, it'll most likely take another 20 minutes to truly reach 100)
2) if you are rooted and have clockwork mod recovery, boot into recovery, and wipe the battery stats. Then continue to the next step. If you are not rooted, dont worry, just go onto the following step anyway.
3) from the market, download a battery calibration app and calibrate it.
4) then use your phone regularly throughout the entirety of its battery cycle (don't plug it in for mini charges until it fully dies)
5) when it dies, recharge it back to a full 100% (don't unplug it before it reaches 100%).
Then you're done.
Sent from my SPH-D710 using xda premium

jedwardmiller said:
Examples of battery life.View attachment 814656
View attachment 814658
Click to expand...
Click to collapse
I refuse to believe your getting 10hours of battery life with moderate emails, calls, txt n social apps running n your battery only dropping to like 80% after 10 hours.
You must not use your phone at all
Sent from my GT-P7510 using xda premium

hijewpositive said:
It seems to me like from those pictures that you barely use your phone for other things than making calls. The reason that i can come to that conclusion is because your display battery usage is just so much less than your Android OS, that just means your screen is off for the majority of the day.
Click to expand...
Click to collapse
I wouldn't jump to that conclusion. By the end of a 16-hour day, I have about 2-hours of screen-time, and my battery is around 50%. I have corporate email on my phone, so it wakes up frequently, and I check my messages all day long.
There's also the issue with Android OS taking up way more of the battery charts than it's supposed to. Most of the time, that bar is 2x longer than my display bar, unless I unplug it and play a game for four or five hours. There is a bug on this phone, that either calculates the Android OS bar improperly, or the phone is genuinely using tons of battery in the background and Android OS is a giant battery drain.
If you hang out on the forums a bit longer, you'll see this pop up pretty often.

trifthen said:
I wouldn't jump to that conclusion. By the end of a 16-hour day, I have about 2-hours of screen-time, and my battery is around 50%. I have corporate email on my phone, so it wakes up frequently, and I check my messages all day long.
There's also the issue with Android OS taking up way more of the battery charts than it's supposed to. Most of the time, that bar is 2x longer than my display bar, unless I unplug it and play a game for four or five hours. There is a bug on this phone, that either calculates the Android OS bar improperly, or the phone is genuinely using tons of battery in the background and Android OS is a giant battery drain.
If you hang out on the forums a bit longer, you'll see this pop up pretty often.
Click to expand...
Click to collapse
lol, I've actually already read those forums before, but the thing is that I just don't think its a bug with those people. The thing is that its simply a balance. If your screen is set to a very low brightness, or just off most of the day, it clearly won't be the main battery drainer, but all that means is that something else will be. Something will always be the main battery drainer, even if its not draining that much.
Maybe it just makes more sense in my head than on here, but I'm pretty sure lol.
Sent from my SPH-D710 using xda premium

YoungAceAtlanta said:
I refuse to believe your getting 10hours of battery life with moderate emails, calls, txt n social apps running n your battery only dropping to like 80% after 10 hours.
You must not use your phone at all
Sent from my GT-P7510 using xda premium
Click to expand...
Click to collapse
lol, you disbelieve all you like, here's another screenshot, from me, to help you come to terms with your issues

That's even better with showing you all his awake time. You are right, I have never wasted my time with Facebook, the internet can live on without my updates, but I do use the phone for corporate email all day as I work remotely and I am on the phone regularly for work. Not sure why you would be getting such bad battery life. I was just trying to help and see if there was anything you could pick up from me that would help with you.

hijewpositive said:
lol, I've actually already read those forums before, but the thing is that I just don't think its a bug with those people.
Click to expand...
Click to collapse
It is in fact a bug. Here is a bug report in Google's bug tracker. Here's another. There's also a very long XDA thread that explains what the Android OS bug actually is, and how it works.
If the lines are proportional, then Android OS is using more power than 2 hours of display time, and I've gone as high as 5 hours and 30 minutes. I've had times when 4 hours of screen time is still less than Android OS. What? That makes no sense.
From the XDA thread:
Same network, same location, same signal strength, same ROM (Changing my font maybe fixed it....) , same wakelocks between them, same background apps running. Not even 5 minutes screen time on the two. The only difference with .14 patched kernels I'm experiencing is that it's not showing up anymore in the stats, but it drains just as much as in the right screen, showing the same CPU state behavior. It's also happening less often, and many say it's not happening at all anymore, but how would they know it it's hidden now?
Click to expand...
Click to collapse
Before that were two screenshots. One of them showed a minimal Android OS bar, while the other had it at 95%. The only difference was the patched kernel. This. Is. A. Bug. Period. High Android OS usage means absolutely nothing. Even after tracking down wakelocks, it will be high or low pretty much at random. Sometimes this is a legit stuck suspend, in which case rebooting is the only fix. Other times, it's just the bad profile. There's no way to know unless you study CPU spy, better battery stats, and possibly Watchdog.
In any case, read that XDA thread that explains what Android OS is. It has very little to do with how much screen time you have.

trifthen said:
If the lines are proportional, then Android OS is using more power than 2 hours of display time, and I've gone as high as 5 hours and 30 minutes. I've had times when 4 hours of screen time is still less than Android OS. What? That makes no sense.
Click to expand...
Click to collapse
wow, thats crazy.

I'm not trying to bash you or say I get bad battery life. I just don't see someone who is taking his or her phone out every 10mins getting emails, and calls, social updates, background syncing is going to get 10hours of battery with just about 95% left.
Maybe if all you do is check emails and take 15 min calls and put your phone back into sleep mode you can probly get that. But even then. I can't say real world usage = 10hr with 95% left. only if you have a extended battery on
From my Samsung GS2 E4GT

This is with an hour of screen time. Admittedly, that's less than half my normal usage, but I was working on my book on the train instead of reading reddit. I'd normally be in the 50's by now with about 2.5 hours of screen time.
Way better than my Eris.
Sent from my SPH-D710 using xda premium

i've found that turning off facebook and twitter sync alone have greatly improved battery life. enough where i dont really have to diable anything else.
i get 24hrs without a charge no problem now. using a rom based off calkulin's EK02 rom.

[TIP] How I get ~24 hours of battery power from my Galaxy Nexus nearly every day!

I will defer to the xda mods if they think this thread is redundant. I have been using my Galaxy Nexus now for ~3 weeks. During that time, I have seen my daily battery life improve from ~10 hours to a little over 24 hours before needing a charge. I have listed out the power saving strategies I've developed during these 3 weeks following the screenshot [PROOF]:
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1.) Calibrate your battery using the following methods here: Battery Calibration.
2.) While on battery power, set your Nexus display's brightness level to ~30%. I've found that particular brightness level to be a sweet spot. Auto brightness does not work for me, so I hard set the level. I am able to get between ~4 to 5 hours total of screen time a day on battery power at that level. There are many Android Market apps/widgets that will allow you to set power profiles depending on your location and power draw and/or charge.
3.) Along with conservative display settings, I turn off cellular data entirely, or only use 2G (Edge) when connected to a WiFi hotspot. I have an unlocked I9250 Worldband GSM Galaxy Nexus, so I'm unable to address 4G LTE. But if I did have access to 4G LTE, I imagine the only time I would use it would be for tethering while the phone is plugged into a power source. Regardless, 3G (HSPA+) can be a significant power draw, and 4G doubly so. When on WiFi, 3G and/or cellular data is off entirely. My guesstimate is this saves me between 15 - 20% battery power throughout the day.
4.) I set application accounts to sync and updates only when on WiFi.
5.) Avoid rebooting or powering off the phone while on battery power. I've noticed a loss of between ~2 - 5% when rebooting the phone on battery.
6.) No live wallpapers, and the image I do use for a wallpaper is very dark. I set the homescreen widgets to nearly transparent and white text. I'm certain this conserves battery power, but by how much I can't say. [REFER]:
7.) During a typical day for me, I'm constantly using Twitter, Google+, Facebook, Gmail, the ICS Browser, TapTalk, and of course the homescreen widgets connected to network services. I would consider myself an average to heavy user depending on the day. All Gmail is pushed. My widgets update between 1 - 3 hour intervals. You can tell by the screenshot provided my WiFi signal is always on, my Awake and Screen On times are between 4 to 5 hours total of the 24 hours available. As you can see from the screenshot, during that 24 hour period I did not top off with a power charge during that time.
Any other tips for extending battery life are welcome. I hope this helps.

Cool. I keep my phone plugged in when I am in the car or desk and that seems enough for me without having to compromise. 4G is a real killer

Are you using Tasker to kill data when on wifi and enable it when not?
I was under the impression the OS did this automatically
Sent from my Galaxy Nexus using Tapatalk

FYI, the original poster is a HSPA+ user. Entirely different experience from a LTE user.

Err... if there is anything I take away from this thread, its: "If you want 24 hours of battery life on your Google Nexus, don't use it."
It's hard to say for certain, but it sure doesn't look like you used your phone very much over 24 hours. :|

sc4fpse said:
Err... if there is anything I take away from this thread, its: "If you want 24 hours of battery life on your Google Nexus, don't use it."
It's hard to say for certain, but it sure doesn't look like you used your phone very much over 24 hours. :|
Click to expand...
Click to collapse
Total time the screen was on was between 4 to 5 hours total out of that particular 24 hour period. Depends on your definition of "use", but I've seen definitions of moderate to heavy smartphone use defined in various forum posts throughout XDA somewhere between 3 to 6 hours of screen time on a single charge. YMMV.

zoetrope said:
Total time the screen was on was between 4 to 5 hours total out of that particular 24 hour period. Depends on your definition of "use", but I've seen definitions of moderate to heavy smartphone use defined in various forum posts throughout XDA somewhere between 3 to 6 hours of screen time on a single charge. YMMV.
Click to expand...
Click to collapse
Based on that image, there's no way you got even 3 hours of screen on time.

wonshikee said:
Based on that image, there's no way you got even 3 hours of screen on time.
Click to expand...
Click to collapse
I'm certain it was over 4 hours, I remember digging into the screen stats under the battery settings before taking a screenshot. I don't have a screenshot of the screen stat window during that 24 hour period.
Don't believe me? I don't really care. I have nothing to hide and nothing to prove. Just relaying my experience with the GN battery over a 3 week period.

I would rather keep 4g on and just charge throughout the day. Why pay a premium if you're not going to use it, but I suppose you don't have 4g so you don't care.

sc4fpse said:
Err... if there is anything I take away from this thread, its: "If you want 24 hours of battery life on your Google Nexus, don't use it."
It's hard to say for certain, but it sure doesn't look like you used your phone very much over 24 hours. :|
Click to expand...
Click to collapse
This. Doesnt look like 4-5 hours screen time because the phone isnt awake enough.
Sent from my Galaxy Nexus using xda premium

I don't see a problem with the battery life for the size of the phone.
I'm sure it would go a day and a half before needing a charge with my usage (which I consider 'normal') but I plug it in everynight while I sleep anyway.
The battery life definately improves after a few charge cycles.

I agree with sc4, you basically are saying not to use the phone. You do not have to take such extreme measures just to get good battery life. I get pretty good battery life and I don't disable anything.

Well I thought it was a nice post. Jeez. Especially if you compare to most of the crap that comes up in the general section.
I couldn't find where he said "dont use 4g der". I believe the idea he presented was to turn off 3g/4g while you're on wifi. Do you need 4g AND wifi? Easy, common sense. Thumbs up.

Just so you know: WiFi uses the same amount of power to transmit/receive data as 3G. You're not saving anything by turning off the 3G radio while on WiFi since the only thing it's being used for is phone calls and text messages.
In addition, being in WiFi all day long can *really* improve your battery life. It's easily the biggest thing on your list. Why? Because the cell radio isn't constantly trying to maintain a data signal to the 3G towers. It maintains a connection but it doesn't have to negotiate for it almost at all...saves a lot of battery life.
Oh, and that Battery Calibration post is ridiculous. When you first get a phone just discard it fully then charge it up fully. Do it once every few months for the life of the phone and you'll find you maintain great battery life. Outside of that, keep it plugged in as *OFTEN* as you can to maintain longevity.
Also, according to your screenshot, your screen was on a *maximum* of 3 hours, but most likely around 2 1/2. That means the data connection most likely wasn't used much more than that, as well. That's very light use over a 24 hour period.
---------- Post added at 08:31 PM ---------- Previous post was at 08:31 PM ----------
smot13 said:
Well I thought it was a nice post. Jeez. Especially if you compare to most of the crap that comes up in the general section.
I couldn't find where he said "dont use 4g der". I believe the idea he presented was to turn off 3g/4g while you're on wifi. Do you need 4g AND wifi? Easy, common sense. Thumbs up.
Click to expand...
Click to collapse
Well, no, you wouldn't...but it turns off the LTE radio when on WiFi anyway...so that's a moot point.

One more tip:
If you use vibrate on keyboard, shorten it to as low as possible.
This is possible using SwiftKey
Sent from my Nexus S using XDA App

hotleadsingerguy said:
In addition, being in WiFi all day long can *really* improve your battery life. It's easily the biggest thing on your list. Why? Because the cell radio isn't constantly trying to maintain a data signal to the 3G towers. It maintains a connection but it doesn't have to negotiate for it almost at all...saves a lot of battery life.
Oh, and that Battery Calibration post is ridiculous. When you first get a phone just discard it fully then charge it up fully. Do it once every few months for the life of the phone and you'll find you maintain great battery life. Outside of that, keep it plugged in as *OFTEN* as you can to maintain longevity.
Also, according to your screenshot, your screen was on a *maximum* of 3 hours, but most likely around 2 1/2. That means the data connection most likely wasn't used much more than that, as well. That's very light use over a 24 hour period.
Click to expand...
Click to collapse
@ hotleadsingerguy
I'll leave 3G running for the next couple of days, see if there's any difference. Thanks for the info. Are you saying the screen on time reported by the OS is not reliable? If not, know of any apps that do report battery stats and usage reliably?
Galaxy Nexus I9250

@rbiter said:
This. Doesnt look like 4-5 hours screen time because the phone isnt awake enough.
Sent from my Galaxy Nexus using xda premium
Click to expand...
Click to collapse
Agreed that is not 4-5 hours of screen time. It is blatant in the graph u provided. Look at the screen and awake times. Here is mine with only 2 hours of screen time but over an hour of voice.
Sent from my Galaxy Nexus using XDA App

To push more, set the animation etc. to 0.5x in the developer options. This should reduce the cpu usage a little bit.
And turn off auto rotate as it consume quite a lot of cpu power. Most probably this is just a bug, there has been a report in the Google code bug yracking.

zoetrope said:
@ hotleadsingerguy
I'll leave 3G running for the next couple of days, see if there's any difference. Thanks for the info. Are you saying the screen on time reported by the OS is not reliable? If not, know of any apps that do report battery stats and usage reliably?
Galaxy Nexus I9250
Click to expand...
Click to collapse
Qhen you go to battery stats tap on the screen percentage. It will tell you exactly how long screen has been on.
Sent from my Galaxy Nexus using xda premium

republitarian said:
Agreed that is not 4-5 hours of screen time. It is blatant in the graph u provided. Look at the screen and awake times. Here is mine with only 2 hours of screen time but over an hour of voice.
Click to expand...
Click to collapse
I agree. I did not get a screenshot of my screen time when I took the screen pic of the timeline graph. I was relying on memory, but after comparing republitarian's pic which has roughly the same timeline span, looks like my memory failed me. Mine is somewhere between 2 - 3 hours of screen time as well. My bad.
Galaxy Nexus I9250

I love the battery life of this thing! Its unbelieveable...

The battery life is Godly on the Galaxy Nexus (Mine's a GSM model...I have no clue about the CDMA version)
With around 10 calls made, my brightness using the power control widget at "half" (I think its something like 40%), wifi on all day, data on, bluetooth&GPS off, NFC off, and almost 2 hours of onscreen time spent texting, surfing the web and gaming I got almost 22 hours on battery with 46% remaining! Pics for proof:
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For those interested in getting this type of performance, I have sync OFF and manually sync whenever I want to check something (mail, weather widget, etc)
I have not had a phone with this great of battery since the Xperia Ray. This is unbelieveable though.
Also for those interested this is what I am running for ROM:
Android version: 4.0.3
Kernel Version: 3.0.18-imoseyon-1.9.0-04417-gcef4285 [email protected] #408
Build number: Gummy-MAGURO v0.7.6
Now how should I kill off my remaining 46%? Because web browsing, playing Nintendo 64 games, Facebook, are not cutting it! LMAO

100% WiFi use and no auto-sync or background data on, that's not surprising whatsoever.

martonikaj said:
100% WiFi use and no auto-sync or background data on, that's not surprising whatsoever.
Click to expand...
Click to collapse
Its not supposed to be a "surprise". I am just saying that the battery life is great. Oh and background data is ON...yes ON!

Adreno said:
Its not supposed to be a "surprise". I am just saying that the battery life is great. Oh and background data is ON...yes ON!
Click to expand...
Click to collapse
Which doesn't matter if you don't have auto-sync lol.

martonikaj said:
Which doesn't matter if you don't have auto-sync lol.
Click to expand...
Click to collapse
Ah...yes. I seem to have fallen on my face. Please accept this cookie *gives cookie*
On another note, could you tell me if games are able to push background data with auto sync off? I've always wondered that.

For what it's worth, Samsung said this phone should have a six day standby time and twelve hour usage time...
Maybe turning all the features of the phone off will help, but then why have a phone like this if you limit it so much?

EP2008 said:
but then why have a phone like this if you limit it so much?
Click to expand...
Click to collapse
Its not really limiting it though.
If I want to see the weather, I touch the widget to sync. If I want to see if I got any mail, I go into the app and it will sync...I get my data when I choose to.
I don't own anything to hook up via blue tooth, and I will just turn GPS on when I check google maps, takes an extra 3 seconds.
I am not missing out on anything, I am literally getting 2 days between charges. But I charge every night anyways, so I can basically surf the web or do whatever on the device all day and still have a ton of juice at the end of the day.

hey man, if thats how u use your phone, then u have great battery life! everyone's uses are different! people can say "oh your bluetooth isnt on" but not everyone uses bluetooth, or needs their auto sync on, etc! some people like to check these things manually

you should update your kernel to 1.10, reports have said that it brings back battery of 1.7.4 but also ups the overall speed/smoothness of the phone

Simer03 said:
hey man, if thats how u use your phone, then u have great battery life! everyone's uses are different! people can say "oh your bluetooth isnt on" but not everyone uses bluetooth, or needs their auto sync on, etc! some people like to check these things manually
Click to expand...
Click to collapse
Yeah I mostly just call, text, websurf, and game. So it works for me.
In comparison, using my Xperia x10, Samsung Captivate, Desire Z, Desire S, Xperia Arc, Nexus S, and Xperia Ray I never got battery life like this. The Ray was close, but this is even better...considering the size of the screen this is really great in my opinion.
I just love this device so much, I am thinking I will just always stick to the Nexus line of devices for now on.

andy2na said:
you should update your kernel to 1.10, reports have said that it brings back battery of 1.7.4 but also ups the overall speed/smoothness of the phone
Click to expand...
Click to collapse
Would that give me even more battery?
I think I am just impressed with this so much because next to what I was running at stock (4.0.1) this blows it away.

Having the screen on for ~2hours is not a clear representation of it's battery life.

Adreno said:
Would that give me even more battery?
I think I am just impressed with this so much because next to what I was running at stock (4.0.1) this blows it away.
Click to expand...
Click to collapse
you are using leankernel 1.9.0, so a quick update and you can compare yourself
some reports from the thread:
http://rootzwiki.com/topic/13299-kernel-leankernel-minimalistic-kernel-1100-2912/page__st__280

You disable auto sync.. that means you have no life.. you can't call your phone as "smartphone"
Sent from my Galaxy Nexus using xda premium

I too think this phone has best battery life ive had particularly idle time. Screen on is a tad high, but all averaged together gives this phone excellent battery life.

EP2008 said:
For what it's worth, Samsung said this phone should have a six day standby time and twelve hour usage time...
Maybe turning all the features of the phone off will help, but then why have a phone like this if you limit it so much?
Click to expand...
Click to collapse
Look, Samsung has NO way to give standby times when everyone uses their phone differently. I sync differently from you. This phone WILL get six days standby. My old Vibrant is rated at 16 days standby, and you know, it just about will get that. "Standby" times aren't "my screen is off". Standby times are no data/wifi/sync and my screen is off. My mother has my unlocked Vibrant on AT&T. She doesn't have a data plan. Data/Sync is off. It's used as a PHONE. After her normal use, which is about 10 minutes of talking a day, it'll be at around 40% after 6 days. At that point, she usually charges it... and that's with evil, battery draining TouchWiz! There is no way for a manufacturer to adequately predict standby times with a device connected to a data network.
Honestly, for the life of me I can't figure out why this is an amazingly hard concept for people to grasp. Just because it's a "smart phone" doesn't mean that manufacturer's test battery life with data/wifi on. Probably because unlike the majority of people in every random battery thread on the internet, manufacturer's realize that once a data network comes into play, usage/sync WILL be different. Even power consumption can vary from tower to tower.

zephiK said:
Having the screen on for ~2hours is not a clear representation of it's battery life.
Click to expand...
Click to collapse
What do you feel is a clear representation?
I've a feeling every person has a different opinion on this.

I'm impressed
I get up at 4.30am for work
get home about 6pm
I have about 60% left
then I destroy that as its unlimited data plan inc tether is my broadband at home.

KWKSLVR said:
Look, Samsung has NO way to give standby times when everyone uses their phone differently. I sync differently from you. This phone WILL get six days standby. My old Vibrant is rated at 16 days standby, and you know, it just about will get that. "Standby" times aren't "my screen is off". Standby times are no data/wifi/sync and my screen is off. My mother has my unlocked Vibrant on AT&T. She doesn't have a data plan. Data/Sync is off. It's used as a PHONE. After her normal use, which is about 10 minutes of talking a day, it'll be at around 40% after 6 days. At that point, she usually charges it... and that's with evil, battery draining TouchWiz! There is no way for a manufacturer to adequately predict standby times with a device connected to a data network.
Honestly, for the life of me I can't figure out why this is an amazingly hard concept for people to grasp. Just because it's a "smart phone" doesn't mean that manufacturer's test battery life with data/wifi on. Probably because unlike the majority of people in every random battery thread on the internet, manufacturer's realize that once a data network comes into play, usage/sync WILL be different. Even power consumption can vary from tower to tower.
Click to expand...
Click to collapse
Perhaps you're giving Samsung too much credit. Apple lists the details of their battery tests on their site, and when they say "10 hours of use", it's not piddling around with sync off, location off, etc. it's actual use (calls, web browsing, video, music).
Look at gsmarenas battery tests http://blog.gsmarena.com/samsung-galaxy-nexus-battery-life-fully-tested-results-come-out-disappointing-test/.. Galaxy Nexus is tied for second worst and all phones were tested the same way. Maybe "real world" use will affect a single device from day to day, but when a phone is compared to close to twenty other phones under the same conditions, it makes you realize how poor the battery life is. Maybe 4.0.5 will make things better... I hope so.

Sorry for a newbie question.
I've had Auto Sync ON all day and I wonder what Auto Sync does exactly ?
Can someone light my day ? Thanks