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Does kernel affect battery?

hi guys im running firebird rom and my battery life sucks really bad. i take it out of charge at 10am and it dies around 4.30pm so does kernel makes battery life bad?
my kernel says : 2.6.32.9 [email protected] #28
please share

Depends. Some kernels are overclocked and will use more battery. Some are poorly put together and will use more battery. Some may not work well with one ROM, but great with another. Not knowing what you do with your phone it is hard to point a finger at the kernel. Poor reception, lots of wifi on time, lots of screen on time, GPS use, push e-mail...lots of things take battery. You need to see what it is you're using and whether that and not the kernel is your issue.

Short answer is yes, kernel affects the battery. All you can do is try a few different ones and see which is best for your usage.

im on messenger services and about 40-50 text and 3 mins of calls and my 3g on and brightness all the way down. no gps no bluetooth or wifi. i use the phone pretty much straight from 10am with maybe 2 mins here and there screen off

sofia-captivate said:
im on messenger services and about 40-50 text and 3 mins of calls and my 3g on and brightness all the way down. no gps no bluetooth or wifi. i use the phone pretty much straight from 10am with maybe 2 mins here and there screen off
Click to expand...
Click to collapse
Well, what more do you want? With that kind of usage I doubt you can do much better with any ROM.

that kinda sux but if the screen is really on that much it is normal, i dont think any rom has been tested to surpass 6 hours screen on time.
one good rom was andromda with which i had a hard time running my battery down in a single day, usually went 2 without a problem and i do a lot of texting. also an old version of perception built off a bell vibrant i9000m rom was outstanding.
kernels affect battery life but clock speed on the cpu has less to do with it than many people think, the assumption is faster cpu speeds means more power drawn but the cpu is governed, the governor setting have a lot to do with it. think about it, is it better for the cpu to take 4 seconds on an operation @ 600mhz or do the same operation in 2 seconds @1.2ghz? depends on alot of things reallly but thew difference is alot smaller than people expect. there is also kernelhz which i dont know much about but reportedly if set down to 100 to match another frequency(cant remember off the top of my head) will increase battery life.
the kernel controls many aspects of the system but i haven't seen a kernel that has had a huge increase in battery life given the same rom since the 2.1 days. and even then the battery life wasnt as good as a couple of the 2.2 roms. it seems to me that the rom has more to do with battery life. some vibrant ports have severe battery drain issues on the captivate. some i9000 ports have amazing batery life but most are about the same as stock to slightly better.
if battery life is a problem first you want to see if any processes keep the phone from sleeping. figure out what apps show in the running process list and try killing them, if they don't die/they start back up then freeze them in titanium backup and see if anything makes a difference. careful freezing system processes, some are not detrimental, most are.
other tips are to try apps that manage 3g like juice defender. and use wifi when you can 3g is a bigger battery hog than wifi. also there may be a way to set the phone to default to edge instead of 3g but i think it varies with the build of the rom, you will have to research that one.
other things to look at is weather you sync to google, facebook, twitter ect. those feeds widgets can eat battery as well as the sync process. weather widgets like beautiful widgets seem to have an effect on some of the vibrant ports i used but not as noticable on other roms.

Yikes...that is some awful battery life. I'm surprised because speedmod (and it's variants) is pretty well accepted as being the best kernel for battery life. There are many threads around here for improving battery life. I have personally found that my biggest battery user was constantly checking how much battery I had used.

If you are barely turning your screen off that is good battery life. You will never make it much past 5hrs screen time. Where people get like 40hrs on a charge is when the phone its not actually used, and their set up has good standby performance
CM7

When I used assonance I would get three days of battery life.
Sent using smoke signals.

As some have said screen time is the single biggest battery user. My phone will last for about 3 hours of screen on time. So I could have my phone die in 3 hours, or 2 days, it all depends on how often I'm turning that screen on.

Connor1 said:
When I used assonance I would get three days of battery life.
Sent using smoke signals.
Click to expand...
Click to collapse
Screenshot of total up time and screen-on time?
Sent from my SAMSUNG-SGH-I897 using XDA App

sf1120 said:
Screenshot of total up time and screen-on time?
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
Here's a screenshot of my normal battery usage when I had a captivate, using Precision 3.5.
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wifi uses less power than 3g, my phone only drops 5% over an 8 hour sleep with wifi on the whole time.

ryude said:
Here's a screenshot of my normal battery usage when I had a captivate, using Precision 3.5.
Click to expand...
Click to collapse
Nice ryude.Mine's not as good,but close.So it just proved to me that when ppl say they got 3 days out of a single charge,they're actually not using their phone all.I'm not trying to flame anyone,just my honest opinion.I bought my phone so I can use it,not leave it on a desk.Here's mine.
Forgot:Running Phoenix Ultimate..

sf1120 said:
Nice ryude.Mine's not as good,but close.So it just proved to me that when ppl say they got 3 days out of a single charge,they're actually not using their phone all.I'm not trying to flame anyone,just my honest opinion.I bought my phone so I can use it,not leave it on a desk.Here's mine.
Forgot:Running Phoenix Ultimate..
Click to expand...
Click to collapse
Yeah, I would say if you're not getting at least 3 hours screen time then you aren't using your phone that much.

Trusselo said:
wifi uses less power than 3g, my phone only drops 5% over an 8 hour sleep with wifi on the whole time.
Click to expand...
Click to collapse
Not if you're in a bad reception area.
This is what I average on Andromeda. Some wifi, some GPS tracking, lots of music streaming via BT.

Of course, nearly everything comes into play. Modem, ROM, use, etc.

Here's my battery life from yesterday..

sf1120 said:
Here's my battery life from yesterday..
Click to expand...
Click to collapse
What ROM are you using?

Miami_Son said:
What ROM are you using?
Click to expand...
Click to collapse
Phoenix Ultimate,jk4 and speedmod.Basically whatever adam threw together.
Sent from my SAMSUNG-SGH-I897 using XDA App

[Q] Battery life

Ive got GN for 4 days use, a screen is hot and battery life is only less than 1 day normal use.
Is your Note have a same? Pls share, worry if need to replace a new Note

vuvan said:
Ive got GN for 4 days use, a screen is hot and battery life is only less than 1 day normal use.
Is your Note have a same? Pls share, worry if need to replace a new Note
Click to expand...
Click to collapse
I'm not getting nearly the battery life that others are claiming.
I just calibrated my battery this time, so we'll see how it goes.
Please post a screen shot of your 'settings -> about phone -> battery usage' and click on display and tell us the 'time on' numbers.
I have about 2 hours of 'time on' time, and I've gone through a third of my battery. And I have very conservative screen settings. I don't see any way I could get the reported 9 hours of video time that Engadget reported.
I'm not complaining though - on my mytouch 4g, I could get probably 3-4 hours of screen time on a battery. Considering how powerful this phone is, and the size/resolution of the screen...... No real complaints.
- Frank
P.S. Can you imagine a hyperion extended battery? The stock mytouch 4g battery is 1400, and the hyperion extended is 3500. So a hyperion extended battery for the note would be ..... 6250 mah??!?!? [email protected] What we need is an ibm 'slice' type of battery - that wouldn't add much thickness.

ChodTheWacko said:
I'm not getting nearly the battery life that others are claiming.
I just calibrated my battery this time, so we'll see how it goes.
Please post a screen shot of your 'settings -> about phone -> battery usage' and click on display and tell us the 'time on' numbers.
I have about 2 hours of 'time on' time, and I've gone through a third of my battery. And I have very conservative screen settings. I don't see any way I could get the reported 9 hours of video time that Engadget reported.
I'm not complaining though - on my mytouch 4g, I could get probably 3-4 hours of screen time on a battery. Considering how powerful this phone is, and the size/resolution of the screen...... No real complaints.
- Frank
P.S. Can you imagine a hyperion extended battery? The stock mytouch 4g battery is 1400, and the hyperion extended is 3500. So a hyperion extended battery for the note would be ..... 6250 mah??!?!? [email protected] What we need is an ibm 'slice' type of battery - that wouldn't add much thickness.
Click to expand...
Click to collapse
That is too bad, I am looking forward to the phone but was really looking forward to a good day of heavy use in...

Well, I'm getting a good days use from mine with battery still left at the end of the day. And it's pretty heavy use at the moment too.
Sent from my GT-N7000 using xda premium

Battery Life is one of my top priorities, which is why this phone seems to be amazing. I would like to hear from more users about this..

I can't wait until ICS & devs start making ROMs & kernel for the Note. I think then, we will see the Note truly shine.

bbdj69 said:
Battery Life is one of my top priorities, which is why this phone seems to be amazing. I would like to hear from more users about this..
Click to expand...
Click to collapse
What kind of battery life test would satisfy you then?

For instance:
I have used a variety of phones over the last 6 months (BB Torch 9800, Torch 9810, BB Bold 9700, Bold 9900, Galaxy 7" Tab P1000, HTC WP7 Mozart) and none of these devices can deal with my pattern of usage every day without at LEAST 2 full depletions and recharges of the battery.
I'm looking to the Note to be the first phone that can last a day, or at LEAST a day with only one recharge.
Engadget reckoned they got 9 hours of video playback on one charge. I do hope that this is indicative of the notes performance...

Niuseek said:
What kind of battery life test would satisfy you then?
Click to expand...
Click to collapse
I am a heavy user. The only battery test I want is if the batter has juice left in it when you are ready to go to bed. I have a 4G Infuse, the POS would die in 6 hours. So lame.

After one day:
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Funk2641 said:
After one day:
Click to expand...
Click to collapse
Your post doesn't tell how the battery life is good. The part that consume the most of the juice is the display and I can see from your post that the screen of your Note was awake just for a little time...
So, trying a browsing and video experience would give us a better idea

Funk2641 said:
After one day:
Click to expand...
Click to collapse
I can tell you right now just by looking at the screenshot you have something keeping your phone awake. No way in the world is Android OS supposed to be that high. Figure out what it is and you'll definitely see better battery life. 90% positive it's an app you installed.

Funk2641 said:
After one day:
Click to expand...
Click to collapse
That's a known ROM/kernel bug in Gingerbread, with AOS taking up so much time. It will be fixed in custom ROMs - though who knows if Samsung will fix theirs ??
Battery tip, if you have NO SIM card in, "cell standby" will tear through your battery in no time. Put it in airplane mode, then enable wifi FTW.

I'm having the same problem. Really frustrating. Needing a recharge every 12 hours or so. And I'm not a heavy user :-/

Dear all,
Today I change a animate wallpaper to static, the result is good, my battery level after same hour, same use is much better.
Before, I full charge at nigh, start use the phone from 7am, web, email at cafe to 8am, have some phone call, email, and web again from 9pm to 11pm.
With animated wallpaper, at 11pm battery is 0, but today, its still at 50%, its good!

vuvan said:
Dear all,
Today I change a animate wallpaper to static, the result is good, my battery level after same hour, same use is much better.
Before, I full charge at nigh, start use the phone from 7am, web, email at cafe to 8am, have some phone call, email, and web again from 9pm to 11pm.
With animated wallpaper, at 11pm battery is 0, but today, its still at 50%, its good!
Click to expand...
Click to collapse
Animated wallpapers are battery death unless they are pseudo animations like that melting droid wallpaper which is effectively a giant battery meter. It's like playing a movie constantly.

When judging battery life, you should take in account that if you just have bought the device, you maybe are using it more than you will in the future. (I said maybe, don't jump at me )
I did... And I got 12 hrs or something.... I think that I will manage a good day with it in the future.
Of course the largest consumer of juice will be the screen... So, use a low brightness whenever you can.
And, I bought Juice Defender + from the Market, this seems a good investment and works fine on the Note. (Free version does too)
http://www.juicedefender.com/
I can live with a data connection that just every 15 minutes goes on to check mail etc.
(although some people complain when they don't hear from me within a minute )

Gede said:
When judging battery life, you should take in account that if you just have bought the device, you maybe are using it more than you will in the future. (I said maybe, don't jump at me )
I did... And I got 12 hrs or something.... I think that I will manage a good day with it in the future.
Of course the largest consumer of juice will be the screen... So, use a low brightness whenever you can.
And, I bought Juice Defender + from the Market, this seems a good investment and works fine on the Note. (Free version does too)
http://www.juicedefender.com/
I can live with a data connection that just every 15 minutes goes on to check mail etc.
(although some people complain when they don't hear from me within a minute )
Click to expand...
Click to collapse
No push email!?

bbdj69 said:
No push email!?
Click to expand...
Click to collapse
Still push email. But just pushing it every 15 minutes only..... (because of Juice Defender)
I don't mind. Life is fast enough as it is, they can miss me for 15 minutes

You may want to see this:
http://www.slashgear.com/samsung-galaxy-note-review-04193076/
Use find on the web page tool to skip to appropriate section: "Phone and Battery"

Serious batttery issue, is this normal?

The battery on my Note is decent, giving me 2-3 days of moderate use or roughly a full day with heavy use.
Problem is when the battery decreases to around 40% & lower, the battery drains like anything even when not used.
Simply idling the phone would lose roughly 5-6% over an hour.
When the battery is around 20% it will easily run down to 10% and less over a period of a few hours when doing NOTHING.
Yet when then battery is at 80 & 90% it will lose around 5-6% battery over many hours.
Here is the proof, I took a screenshot of the battery information & you will clearly see rapid drops in battery life when at 50% and less.
On the last 20% it goes down even faster, and this is with NO use at all.
I hope this is fixed in ICS as it's a serious problem.
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"lightbox_full_screen": "Full screen",
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"lightbox_download": "Download",
"lightbox_share": "Share",
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Pretty flat at the end there, even while being used.
I have seen that reported elsewhere, but not seen it on my own Note. I have just settled it into a new pattern after rooting and deleting the stats, so I am not certain right now, but I think it remains fairly even over the whole cycle.
I am not sure I could use is as little as you appear to have however!

I've yet to get my Note battery to last until 2 days, and not even a full 24 hours (almost heavy usage on data network).
So I guess that's good enough that yours lasted for almost 3 days!

eman369 said:
I've yet to get my Note battery to last until 2 days, and not even a full 24 hours (almost heavy usage on data network).
So I guess that's good enough that yours lasted for almost 3 days!
Click to expand...
Click to collapse
Haha, don't get me wrong, I think the battery is great.
I'm only wondering why it goes so quickly when it's at 40% and under...

This seems odd. I'd say I'm having the same issue (the poor battery performance).
I've been trying to analyse this but don't have much time to do it right. From what I'm seeing the battery usage graph looks legit. Phone seems to enter deep sleep states. Nonetheless Note seems to drain the battery a lot faster in deep sleep than my Galaxy 3 does, which is odd considering Note having 3 times larger battery capacity.
What seems odd too is extremely slow suspend/resume cycles (e.g. the time it takes for the phone to turn the screen off/show lock screen). It takes more than a second on my Note to show the lock screen. I've seen other report this too. A friend of mine shocked a salesman on a Samsung booth lately when he showed him that. Galaxy S2 is thunderfast, while Galaxy Note takes ages to resume. My Galaxy 3 takes <0.5s. I've looked into the `dmesg` output for some hints. I'm no guru in this, but `ehci` seems to be taking some time to suspend/resume. This also converges with my other observation - Galaxy Note notoriously locks up when playing with usb host. I've tried couple of keyboard/mouse on usb - some of them do work, some of them don't (I can see 'Mouse/Keyboard' connected on the statusbar but there's no mouse pointer nor keyboard input is possible; after some time it's most likely to hard lock the system).
Thus I would suspect buggy usb host/otg hardware/driver that's leading to such a poor battery performance. But hey, maybe it's just me and my theories. Nevertheless something must be broken.

My battery is terrible.
With soe usage, mostly data, I'll drop from 100% to 60% in 3 to 4 hours.
Im on rocket rom.
Only 1 heavy gmail syncing and 3 other gmails with barely an email per week and facebook syncing.
And microsoft exchange calendar syncing (no email syncing).
No twitter.
No other apps.
But im on H+ most of the time.
---------- Post added at 05:12 PM ---------- Previous post was at 05:11 PM ----------
I know HSPA (H+) eats battery because I turned off my data for 2 days and battery latest me 1.5 days.

CorruptedSanity said:
My battery is terrible.
With soe usage, mostly data, I'll drop from 100% to 60% in 3 to 4 hours.
Im on rocket rom.
Only 1 heavy gmail syncing and 3 other gmails with barely an email per week and facebook syncing.
And microsoft exchange calendar syncing (no email syncing).
No twitter.
No other apps.
But im on H+ most of the time.
---------- Post added at 05:12 PM ---------- Previous post was at 05:11 PM ----------
I know HSPA (H+) eats battery because I turned off my data for 2 days and battery latest me 1.5 days.
Click to expand...
Click to collapse
I found gmail syncing kills the battery very very fast. try to disable auto sync and see if that helps

Moved To Q&A​
All questions in the Q&A section please!​

indie said:
I found gmail syncing kills the battery very very fast. try to disable auto sync and see if that helps
Click to expand...
Click to collapse
Why in the world would I do that?
Its 2012. I need/want my data pushed.
Turning off auto sync would be like me going back to 2004.

CorruptedSanity said:
Why in the world would I do that?
Its 2012. I need/want my data pushed.
Turning off auto sync would be like me going back to 2004.
Click to expand...
Click to collapse
I just made a suggestion, that's all. I'm trying to help you save battery. If you want all the bells and whistles and want battery then going for the extended battery is your route. I don't think you will get much more from the standard.

I have had troubles with battery life since I bought this beauty. I have been trying several Roms and Kernels, and none seem to make much difference. I also tried selecting among governors but still no better luck.
When I have 20-24hrs battery life it is very good!
The only thing that allowed me to save some was to reduce lcd intensity, and use the Note in dark environments.
Maybe I am using it more than the average user, but with all the opportunities it provides, I can hardly refrain myself from using it.
My typical use is:
- Radio and surf when going to work and home,
- Email and surf every hour at work
- About 10-20mn phone calls
- Listening to music when I can be alone working (1-2 hrs each day)
- Tablet use when at home.
Do you consider this to be a very heavy usage of the phone ?

I have just had my Note for a few days. The biggest battery eater in my case is WiFi. If I switch it off, the discharge is quite acceptable (a couple of percent during the night). I am not deep into Android internals, but it seems my 5-year-old Palm TX had much better WiFi power management than my brand new Note!
BTW, I am on a stock ROM and have disabled auto-sync.

Have you tried wiping battery stats? Let the phone completely die then charge it without interruption until it's been on 100% for an hour then boot to CWM and wipe battery stats
Sent from my Galaxy Nexus using XDA App

indie said:
I just made a suggestion, that's all. I'm trying to help you save battery. If you want all the bells and whistles and want battery then going for the extended battery is your route. I don't think you will get much more from the standard.
Click to expand...
Click to collapse
I thank you.
I wasn't lashing out at you. I know you were trying to help.
It was directed to the R&D at Samsung.
sudisk said:
Maybe I am using it more than the average user, but with all the opportunities it provides, I can hardly refrain myself from using it.
My typical use is:
- Radio and surf when going to work and home,
- Email and surf every hour at work
- About 10-20mn phone calls
- Listening to music when I can be alone working (1-2 hrs each day)
- Tablet use when at home.
Do you consider this to be a very heavy usage of the phone ?
Click to expand...
Click to collapse
I do not consider the battery able to cope with the features.
I'm on H+. why wont I have everything auto syncing?
Battery should support the phone features.
Rght now I'm always connected to a power source via USB or car charger or home charger.

CorruptedSanity said:
Why in the world would I do that?
Its 2012. I need/want my data pushed.
Turning off auto sync would be like me going back to 2004.
Click to expand...
Click to collapse
well... then stop complaining about your battery drainage...
The other guy were simply gave you a advice as to why your battery were used up so fast....

mustang2012 said:
well... then stop complaining about your battery drainage...
The other guy were simply gave you a advice as to why your battery were used up so fast....
Click to expand...
Click to collapse
I can complain. I paid $750 for it.
The bells and whistles are there but the battery can't cope. Major flaw in battery implementation.
I already told the other guy i appreciate his help but that defeats the purpose of such an advanced and sophisticated mobile phone.
I had a SE symbian for 3 years then several HTC WM 6 mobiles, then a year of HTC Desire then an iPhone 4 for 1.5 years. I'll head towards the best regardless of brand.
Quit being a fanboy.

mustang2012 said:
well... then stop complaining about your battery drainage...
The other guy were simply gave you a advice as to why your battery were used up so fast....
Click to expand...
Click to collapse
I am not complaining about the battery drainage per-se.
My previous phone was a Nokia N900, which I used all day long for calls, mails, radio listening, ssh to my home computer, etc... and I knew well that I could not use it for more than a day without charging, sometimes even less.
The phone battery was never advertized as being able to cope with such usage, and only announced battery times for 2G/3G calls.
When I first read announcements about the N7000, I read that Samsung decided to increase the battery power to make it last 2 days, which looked nice to me.
Now I have hardly 13 hours of battery time with my usage (see my previous post) and I want to know:
- is it a normal behaviour for the phone?
- is there a way to make things better with the same hardware?
- do I really need to lower my expectations?
If the answer to the last question is yes, I will be of course disappointed but I can cope with it, as I did with my previous phones. As CorruptedSanity already mentioned, my only complains are to the Samsung techs (or advertizers) and not to any member of this forum who are usually able to help beyond my needs.
I hope that screen optimizations will come that will increase the battery life while I use the phone, but my expectations are low.

You can expect around 5 hrs of screen time based on peoples reports here
Sent from my GT-N7000 using xda premium

indie said:
You can expect around 5 hrs of screen time based on peoples reports here
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
Yup, that's the killer IMO. I can leave WiFi enabled all day, or use the phone for a couple of hours of calls and a few hours of 'screen time'. Not both!
Before rooting and killing bloatware, I could do neither.

Milestone & CM7 battery

Hi all
My phone was in for repairs recently. I got it back on the 8th (April 2012) and so I flashed the Vulnerable Recovery sbf and restored my CM7 backup I made the day it went in for repairs. Now, it's been a month, and I'm not sure what it used to be like, but my battery can't even last a day.
Currently I'm sitting on 92% and and took it off charge exactly an hour ago...and since I'm typing on my phone right now, by the time I'm done, it will probably be 90%.
Yesterday, with minimal use, my phone, after 12 hours unplugged, was on 17%.
Should I be concerned? I'm using CM7.1.5.
Sent from my Milestone using XDA App

actually dude... i also noticed that as well.. cm7 really drains the battery quick...

I need to know what you all are experiencing. It's just a few minutes shy of 12 hours since I unplugged. And apart from two 1 minute calls and updating 4 apps on the market, I barely used the phone (only checked this thread about 4 times on the XDA app). It's now at 14%. It's a bit worrying, because I'm still on my way home, and it's almost like I can't manage a day at work without needing to charge. And I don't carry a charger or USB cable around most of the time.
Please give me your inputs. I know this is a fairly common problem to hear about, but I'm sure my CM7 experience could be better. Ps, I have calibrated the battery. Mostly keep EDGE on instead of 3G if I'm not really using it. Also, never have the GPS on, nor WiFi, nor Bluetooth.
Sent from my Milestone using XDA

The milestone never got a good battery life. Since my gf had it new, she cant make a day. (she's not a "phone" girl, she use it for txt/call, thats it).
Around 25%, you have about 3 hours on sleep. if I use it, it will drop to 0 very fast.
The phose is a year and half old, 2 battery rotation and froyomod 2.9.3 rom.
And for the same time of use, my desire z can last 2 and a half easy.

I have a mugen 1700 battery (same size as the original one but 20% more power) and I can use my phone for 24 hours without charging (even if I usually charge it during night even if not completely discharged) .
I use 3g with toggle2g enabled, Facebook, whatsapp and other common apps and Widgets, I have autosync fully enabled, and I play games do less than one hour per day.
Maybe you should try a different battery
Sent from my Milestone using XDA

scoutme said:
I have a mugen 1700 battery (same size as the original one but 20% more power) and I can use my phone for 24 hours without charging (even if I usually charge it during night even if not completely discharged) .
I use 3g with toggle2g enabled, Facebook, whatsapp and other common apps ahind Widgets, I have autosync fully enabled, and I play games do less than one hour per day.
Maybe you should try a different battery
Sent from my Milestone using XDA
Click to expand...
Click to collapse
Hi i also have a battery problem. Can you say from when i can buy it if i from queens,new-york?
And my friends from israel maybe want it,can have shipping? What its price today?
Thanks.

adome5 said:
Hi i also have a battery problem. Can you say from when i can buy it if i from queens,new-york?
And my friends from israel maybe want it,can have shipping? What its price today?
Thanks.
Click to expand...
Click to collapse
http://www.mugen-power-batteries.co...-extended-battery-for-motorola-driod-pro.html
Sent from my Milestone using XDA

it's a good battery, but for the today MS quotation, it's like half of its value..
I've bought a DEJI 2000mAh for a bunch of euros, but honestly 2000mAh is just the nominal power, it lasts like the stock one..

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um, what?

My phone is now one year old with stock battery. It's has a decent battery life, with toggle2g enabled, full autosync with Facebook, Path, Twitter, Whatsapp, Google+, Dropbox, Gmail, I get about 12 hours with moderate usage.
Brightness is fixed at max.
But it is unstable. Some days my battery will last for 12 hours, some days it's at 15% in 5 hours.
I dunno if it is CM7, but sometimes the phone has dificulties in syncing and it does get really hot.

To me, the stock battery is too hot, and keeps discharging faster the more hot gets. My mugen never gets that hot, and never fluctuates that much in duration
Sent from my Milestone using XDA

scoutme said:
To me, the stock battery is too hot, and keeps discharging faster the more hot gets. My mugen never gets that hot, and never fluctuates that much in duration
Sent from my Milestone using XDA
Click to expand...
Click to collapse
Oh yeah, I notice that too. when you use the phone, maybe 5 minutes later, the phone is hot.
One other thing, the milestone can charge 20% to 100% in an hour. its really fast, and its not very good for a lithium battery since it comes very hot.
what are your average charging time?
(running froyomod)

nitrobg said:
um, what?[/QUOTE]
I would assume this isn't your daily phone anymore? You have no usage by texting or calls. Sure, you got 5 days standby time, but that's literally on an unused phone.
Click to expand...
Click to collapse

oVeRdOsE. said:
Oh yeah, I notice that too. when you use the phone, maybe 5 minutes later, the phone is hot.
One other thing, the milestone can charge 20% to 100% in an hour. its really fast, and its not very good for a lithium battery since it comes very hot.
what are your average charging time?
(running froyomod)
Click to expand...
Click to collapse
actually, you should leave it a bit more in charging state, to avoid internal counter fail. That said, yes, the battery is rather fast in charging. I really suggest you the mugen battery, that's fast in charging but slow in discharging

Hmm, going through all of this, my usage doesn't seem too different to you guys. Maybe I should just get used to it. I actually did buy a spare battery off eBay - but it's just another BP6X battery. I think I will try this mugen battery.
Sent from my Milestone using XDA

Hello d.casper.b. I upgraded to CM7.1.5 (from stock Eclair) in Jan 2012. Since then I have a bit better batt life. Standard battery. I unplugged my phone yesterday (Sunday 15th Apr 2012) at about 12:30 - 1:00 pm. It's now Monday 3:10pm and I'm at 50%. My wifi is on all the time, except I turn it off when I go to bed so it don't wake me up with email or whatsapp messages. I don't have sync on and my phone is not on a data service. I have only used it for some light browsing since unplugged. No music or streaming data. No screensavers. Auto-brightness. I will use the bluetooth when driving home from work. That said - I typically get 24 hours+ on a full charge - except if I do some youtube or other streaming stuff.
That said - I don't think the ROM is the issue. You should try a battery calibration. Also - when it gets to 100% charge, leave it for at least 15-30 mins more plugged in.

Please stop suggesting battery calibrations. I really don't think anyone has a clue what they're talking about when they suggest it.
What you all call "battery calibrations" doesn't do anything other than make Android forget how the battery has been used -- that means the USAGE STATS. It can take a few charge/drain cycles before the battery meter reads true after that. It doesn't do a damn thing to your battery life.

destruct2k sorry - but no need to get hot under the collar about it. But in a sense - you have a point about the batt cal. It's been suggested on other threads - but I've never tried it - and so I shouldn't be recommending it to anyone. I only repeated what others had suggested some time back. Peace.

Anil - You're right, I overreacted there, but not too long ago I saw a 3-page article posted on Google+ by a woman that works on Android for a living about how "stupid" (her word, not mine) the concept was that deleting a file in software could somehow affect the battery's ability to hold a charge. Ever since that read, my opinion on "calibration" has changed significantly. If I could only find that article...

I have the same issue. And it's kinda strange because it's only comin up with CM 7.2
The worst battery life was 30 minutes. I charged it to 100% and I went for a walk before I went to my dance class to teach and after 30 minutes it's drained from 100 to 13% and I did nothing just listening to music. Weird. And when I charge my battery it's like going to 20% like in 5 mins and then 2 mins later it's on 60% and then 40 minutes later it's charged...I'm tryna find a solution for it cos it's soooo frustrating and I don't wanna change my phone til Milestone 4 is coming out!

Battery Report Review - Pre OTA vs Post OTA Update

I picked up my Nexus 4 yesterday and got everything setup. The stats I posted are only from today, coming from fully charged. I have not updated to the latest OTA yet.
You will notice that after 9 hours, I still have 40% left.
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A good portion (about 4 hours) of the day was spent inside a building that results in poor reception. As a result, there should've been more battery drain during that time. Also, I have wifi enabled almost the entire time.
The screen was on for almost 2 hours.
The Nexus 4 gets plenty of deep sleep.
Some notes about my activity. I listened to music through a bluetooth headset for about 20 minutes. I sent and received over a 100 text messages. Wifi was enabled and connected almost the entire time. Autosync for email, contacts, calendar, facebook, and twitter are enabled. I have Tasker running in the background. I played around on some social apps (Facebook, Twitter, Instagram, etc) and downloaded/updated a few apps.
This is probably light to moderate usage in my eyes and would easily get you through an 8-hour work day. Battery drain was between 5% and 7% per hour, depending on when during the day you calculated it. It usually averaged around 6% drain per hour though.
I'll probably take a few more screens of my stats tonight before updating to the OTA. I'll then report back tomorrow with similar screens to see if the OTA helps battery consumption at all.
EDIT: I have posted updated stats on page 5. These will include stats after the OTA update.

Thanks for this! With all the backorder emails going out I'm definitely going to wait a few weeks before I decide if I'm going to order one. If I do it will be hard to part with the 3100 mah battery in the Note 2. You can't kill this thing!
Sent from my GT-N7100 using xda premium

thegregulator said:
Thanks for this! With all the backorder emails going out I'm definitely going to wait a few weeks before I decide if I'm going to order one. If I do it will be hard to part with the 3100 mah battery in the Note 2. You can't kill this thing!
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
No problem! If anyone knows how to properly embed the image attachments into a post, then please let me know. It seems my embedded images disappeared after posting them.

Fantastic job OP. You are officially my favorite poster on XDA today, cherish that honor.

Nospin said:
Fantastic job OP. You are officially my favorite poster on XDA today, cherish that honor.
Click to expand...
Click to collapse
I feel honored! :victory:

Looks quite promising it'll definitely blow my HTC Desire HD away can't wait to get mine.

thegregulator said:
Thanks for this! With all the backorder emails going out I'm definitely going to wait a few weeks before I decide if I'm going to order one. If I do it will be hard to part with the 3100 mah battery in the Note 2. You can't kill this thing!
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
the only thing that's keeping my decision tough is that 3100 mAh battery.
based on the OP stats, it's doing a decent job. i think it can do a better with further updates to come from Google, i am just not sure since battery life on my G Nexus was horrible.

Ouch that is pretty ****ty battery life for a device you've hardly used. My GS2 would be on like 70% with what you've used....

Venekor said:
Ouch that is pretty ****ty battery life for a device you've hardly used. My GS2 would be on like 70% with what you've used....
Click to expand...
Click to collapse
Keep in mind it should get better after 4-5 cycles. It's certainly not groundbreaking but it's also nothing to sneeze at. With some monitoring you should have no problem making it through a day without charging. I don't like monitoring though, which is why I love this Note 2
Sent from my GT-N7100 using xda premium

Venekor said:
Ouch that is pretty ****ty battery life for a device you've hardly used. My GS2 would be on like 70% with what you've used....
Click to expand...
Click to collapse
That's actually not too bad. Like thegregulator said, it's decent and will get you through the day. Also, I think my battery drains more when signal is bad, and you will notice that I'm in an area with really bad signal for a good portion of my day.
thegregulator said:
Keep in mind it should get better after 4-5 cycles. It's certainly not groundbreaking but it's also nothing to sneeze at. With some monitoring you should have no problem making it through a day without charging. I don't like monitoring though, which is why I love this Note 2
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
Here are some updated usage shots by the end of my day. It averages out to about 7% consumption per hour, giving me about 14 hours worth of battery life.
I just updated to the OTA and will charge my phone overnight to give it a full charge and update this thread again tomorrow afternoon after another full day's usage.

I don't understand... I always thought 1-2.5 screen time was terrible for 14-18 hours. I get 3-4 in 24+... Hopefully battery will get betterbwith custom kernels, ROMs, and underclock.
Nexus S (GSM i9020a)
AOKP (Milestone 1 - 4.1.2)
Matrix Kernel (24.0 - CFS)
Ondemmand (Screen On) (800/100)
Wheatley (Screen Off) (400/100)
Deep Idle (N/A - Deadline)
BLX (N/A - Inverted Apps)
Black Exodus (Stock Voltage)

309041291a said:
I don't understand... I always thought 1-2.5 screen time was terrible for 14-18 hours. I get 3-4 in 24+... Hopefully battery will get betterbwith custom kernels, ROMs, and underclock.
Click to expand...
Click to collapse
I wouldn't say it is terrible battery life, but I would say there is room for improvement.
Again, keep in mind I experience a little more battery drain due to poor reception. I saw someone else post a screenshot reaching 18 hour battery life, with almost 3 hours of screen usage.
Hopefully, the OTA provides some better usage times. I'll report back again tomorrow afternoon.

Stryder5 said:
I wouldn't say it is terrible battery life, but I would say there is room for improvement.
Again, keep in mind I experience a little more battery drain due to poor reception. I saw someone else post a screenshot reaching 18 hour battery life, with almost 3 hours of screen usage.
Hopefully, the OTA provides some better usage times. I'll report back again tomorrow afternoon.
Click to expand...
Click to collapse
Almost* 3 hours :/.... I hope you people have data on 24/7 or I'll be really unhappy with the battery so far. I'm still totally getting the phone though
Nexus S (GSM i9020a)
AOKP (Milestone 1 - 4.1.2)
Matrix Kernel (24.0 - CFS)
Ondemmand (Screen On) (800/100)
Wheatley (Screen Off) (400/100)
Deep Idle (N/A - Deadline)
BLX (N/A - Inverted Apps)
Black Exodus (Stock Voltage)

Yesterday after 8 hours I was at 35% battery with only 1h 45m screen on time. Battery isn't great. Didn't watch any videos or play any games.
Sent from my Nexus 4 using Tapatalk 2

jaju123 said:
Yesterday after 8 hours I was at 35% battery with only 1h 45m screen on time. Battery isn't great. Didn't watch any videos or play any games.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
This is really bad. I often reach 6 hours of screen on time on my GS2 with a 2000mAh battery.
I don't understand which part of the Phone is draining that much power,
IPS panels are usually pretty efficient, the S4pro if not pushed should not drain that much either.
The only reason I can think of is that the CPU is spending too much time at the max clockrate with multiple cores online.
Can someone post a screenshot of CPU spy?

I would be interested to see what the battery life is like in airplane mode over a few hour period. One with the screen off (more than likely in deep sleep), the other with the screen on. If the problem is in the jelly bean kernel that can be fixed on xda. If it is the screen draw that is a little different. I have full faith in the developers on xda.
sent from my perfect 32GB Nexus 7

My gut says that the kernel could have used a couple months more cooking time. The hardware is way too efficient for these performances.

wurzelsepp3 said:
This is really bad. I often reach 6 hours of screen on time on my GS2 with a 2000mAh battery.
I don't understand which part of the Phone is draining that much power,
IPS panels are usually pretty efficient, the S4pro if not pushed should not drain that much either.
The only reason I can think of is that the CPU is spending too much time at the max clockrate with multiple cores online.
Can someone post a screenshot of CPU spy?
Click to expand...
Click to collapse
I'm pretty sure I included CPU Spy in my screen shots.
Sent from my Nexus 4 using xda app-developers app

Stryder5 said:
I'm pretty sure I included CPU Spy in my screen shots.
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
You did, but he can't see how much time was spent at the highest clock rate. Looking at those shots, it seems like your phone isn't going into deep sleep nearly as much as it should. Maybe check your wake locks and see what's keeping it awake?
Sent from my GT-N7100 using xda premium

Is it possible they put a cheap battery in like those 5000mah ones but they really more like 500mah ones
Sent from my SGH-T999 using xda app-developers app