Database Users

Best Battery-Saving Kernel

I'm currently using Cyanogen 6.0 RC3 with the Kernel that came with it, and I'm not too impressed with the battery - seems to be draining a lot when on stand by. Just curious on the best battery-saving Kernel out there that is stable and is great with battery percentages.

Try some of wildmonks UV kernels.

I'm also wondering about this. Im currently on kmobs #48 kernel. I have set cpu with profiles set up to under clock when screen is off. Anything else I could try. And no I don't want juice defender.
Sent from my Nexus One using Tapatalk

CM6 is a battery hog for some reason... try enoms...

lengz said:
Try some of wildmonks UV kernels.
Click to expand...
Click to collapse
x2 i've been running 2.6.35.4_SVS-950mV_CFS_AXI_720p_1113MHz_082710.zip on the latest nightlys and battery life has been very good

Just flashed the 1190mhz WildMonk's Kernel and it seems to be a little laggy, can't comment on the battery usage though (I will tomorrow).
I've been reading and people are saying >1190mhz is very stable, but I've been seeing that people are clocking it much lower than 1190mhz (at 1133mhz). I don't care about the speed, I just want my phone to last longer, and to not crash.
Should I flash the 1133 instead of the 1190?

2.6.35.4_SVS-950mV_CFS_AXI_720p_1113MHz_082710 is extremely stable on CM6 & offers much better battery life than stock kernel.
I use it with GPRS/Wifi on full time, moderate browsing (about 1 hr), 20-25 SMS's sent, 50 SMS's received & around 1 hr of talk time. Leaves me with more than 30% juice even after 24 hrs.
To do better on battery life, avoid using the live wallpapers & use a black/dark
static wallpaper.
Cheers !

seventyfivein said:
2.6.35.4_SVS-950mV_CFS_AXI_720p_1113MHz_082710 is extremely stable on CM6 & offers much better battery life than stock kernel.
I use it with GPRS/Wifi on full time, moderate browsing (about 1 hr), 20-25 SMS's sent, 50 SMS's received & around 1 hr of talk time. Leaves me with more than 30% juice even after 24 hrs.
To do better on battery life, avoid using the live wallpapers & use a black/dark
static wallpaper.
Cheers !
Click to expand...
Click to collapse
CM6 Nightly from 9/7 DOUBLED my battery life and a few others in the thread. Haven't updated since. Last night I went to sleep at 3AM with 42% after first unplugging it @ 10:30AM

FishFan319 said:
CM6 Nightly from 9/7 DOUBLED my battery life and a few others in the thread. Haven't updated since. Last night I went to sleep at 3AM with 42% after first unplugging it @ 10:30AM
Click to expand...
Click to collapse
How is it for stability?

FishFan319 said:
CM6 Nightly from 9/7 DOUBLED my battery life and a few others in the thread. Haven't updated since. Last night I went to sleep at 3AM with 42% after first unplugging it @ 10:30AM
Click to expand...
Click to collapse
D'ya have a link?
I can only seem to get back as far as 9/10... Thanks!
Sent from my Nexus One by magic electricy-bubbles flying through the air...

ganna give this a shot now. thanks... i use to use intersect ravens kernels but since froyo came out i havent tried anything. i assume i just flash this.....

http://forum.xda-developers.com/showthread.php?t=693375

Battery life on latest CM Nightlies has been very impressive with the included kernel.

i saw him tweet this... whats CM nightlies?

Pershoot is number one, no question about it.
http://droidbasement.com/db-blog/
I have brightness at 100% full-time (Love it!), I have live wall papers 100% (Love it!) of the time and have 3g always with 2 Gmail accounts push via K-9.
GPS off, BT off. WiFi off.
I have CM6.0 with this kernel (1 month old version). It is OC, UV + Extra RAM with no HD(?).
I doubled my battery life on CM6 and very easy get 1 day out of it, almost never below 30% - from 7am to 11pm. I'm at 49% (midnight) with my average use.
If I stream radio, I drain about 15% per hour on 3g. I drain about 5% to read top 20 news on Engadget app (twice a day)
This is my second kernel from this developer. I used one with 2.1 and now with 2.2. I know I'm coming again for the new one when I feel I need to.
I do not limit my usage, as I WANT to kill my battery, but can't succeed.

TailsNeon556 said:
x2 i've been running 2.6.35.4_SVS-950mV_CFS_AXI_720p_1113MHz_082710.zip on the latest nightlys and battery life has been very good
Click to expand...
Click to collapse
this is the one i have gave a try and I am very impressed.

battery problem kyrillos Rom

i use the latest release, 3.3 version and my battery drains in like 10 hrs of normal usage...
the worst part is that upto 95% of battery is consumed just by display?
i used to get 2 days of battery backup previously on the official Rom.
i tried re flashing kyrillos Rom yesterday and i still get the same problem :’(
is there something i am missing?
or should i wait for atleast 1 week after flashing?

I don't know, but you can also install Juice devender from the market
I like that app. Now the battery has a longer life: 2 days.

The battery seems to be a problem indeed with our devices. Mine was on 5% for 12hrs yesterday.
I've read advice from Lestat, I think, to charge the battery completely before flashing.
I've yet to test it though.

Markie16 said:
I don't know, but you can also install Juice devender from the market
I like that app. Now the battery has a longer life: 2 days.
Click to expand...
Click to collapse
k will try....

Bubble-be said:
The battery seems to be a problem indeed with our devices. Mine was on 5% for 12hrs yesterday.
I've read advice from Lestat, I think, to charge the battery completely before flashing.
I've yet to test it though.
Click to expand...
Click to collapse
thanks for the advice will test it too...

Just found an app specific for this purpose here on the board : [APP] Battery Calibration - EASIEST WAY!

Bubble-be said:
Just found an app specific for this purpose here on the board : [APP] Battery Calibration - EASIEST WAY!
Click to expand...
Click to collapse
awesome bro, will reply here with the results soon......

does some1 know a fix to show my battery in units in stead of dozens? srry for my english^^

boom....battery at 60%, 25 hours and still.running ( but can only say its because of this when i get home....because right now my cell phone is in airplane mode)

thanks
i think i know why i am loosing battery very fast

It may have to do with cpu scaling also.I installed cpu master and saw that the cpu is always on 667mhz and not down-scaling when not in use.
Kyrillos 3.3 rom

try using SetCPU...

clarkkov said:
This depends on the network you use, but you can set your phone to use only GSM network or only WCDMA network in the Mobile network settings, if you are located in area where your network switches constantly because of a weak signal your battery will drain itself because of constant refreshing and switching between GSM and WCDMA networks. WCDMA (3G) network uses more battery even if not switching.
Click to expand...
Click to collapse
Thanks, mine is set to GSM only, since i don't use 3G..
I tested my phone again now for the past two days and found out that it comes for like 20-24 hrs in moderate (daily usage), which is ok for me....
the battery first reduces to 80% in the first 1 hour (even with minimum usage, don't know why this happens), and then it stays at 80-60% for like 15-16 hrs...

I got this problem in Kyrillos 3.0beta version...but now in 3.3 its fine...i can use mine till 2.5 days...widout task manager!!! :-/ i dunno...!!! Juicedefender works cool for sum ppl!!!! the oder solution try Indroid 3.0 - it has better battery backup!

clarkkov said:
You should callibrate your battery with one of the callibration apps, or charge to 100% and then delete battery stats file manualy. Then discarge your battery completely so the phone switches off. The next cycle should be better. Those first 20% percent do go faster than the rest of the battery.
Sent from the other side
Click to expand...
Click to collapse
I installed the calibration app. It said i have to charge it till 100 % and then click calibrate....
I did and now iam 50% in just 7 hours....
So should i let the phone discharge completely?
By the way i flashed with jpm earlier with half battery left....
Sent from my GT-I5800 using XDA Premium App

Guys, all in all i blv its rom specific problem..i m tryin the battery calibration app...meanwhile have a look at this article...
VVV.androidpolice.com/2010/12/14/your-battery-gauge-is-lying-to-you-everything-you-need-to-know-about-bump-charging-and-inconsistent-battery-drain/

clarkkov said:
After calibration one more cycle will be short. The next cycle will be at least double battery life. I get 30+ hours with moderate use (wifi, calls, sms, light games with GSM non-stop) now. I can also recommend Juice defender as an aid for battery conser ation. setCPU doesn't help.
Sent from the other side
Click to expand...
Click to collapse
true , true, true thanks for confirming

still 30 hours isnt enough, its roughly a day.
With 2.1 original firmware and data activated all day i could get 50hrs minimum of battery life.
I'm done with this phone, done trying different roms, calibrating batteries, charging and discharges in less than a day.
i think this phone rocks, except its battery life sucks!
im selling it to change for something with better battery, maybe bb?

baicunko said:
still 30 hours isnt enough, its roughly a day.
With 2.1 original firmware and data activated all day i could get 50hrs minimum of battery life.
I'm done with this phone, done trying different roms, calibrating batteries, charging and discharges in less than a day.
i think this phone rocks, except its battery life sucks!
im selling it to change for something with better battery, maybe bb?
Click to expand...
Click to collapse
Battery problems is from ext4! You can convert all partitions to ext2 with normal battery life but with more chances for data to lost if you remove the battery!

kyrillos13 said:
Battery problems is from ext4! You can convert all partitions to ext2 with normal battery life but with more chances for data to lost if you remove the battery!
Click to expand...
Click to collapse
thanks for your reply, do you mean this battery problem doesn't occur in stock 2.2 recently released ?

[Q] Concerning Overclocking

I think I've finally gotten a good grip on this Nook stuff, a million thanks to everyone here.
My Nook is where I want it to be currently with the latest CM7 stable.
It seems like everyone is overclocking and now I'm curious.
Do you guys keep the overclock on the entire time you're using the nook? Or do you turn it on when you need the extra performance?
Does it shorten the battery life by much?
Is it harmful at all to the hardware?

capnblackleg said:
I think I've finally gotten a good grip on this Nook stuff, a million thanks to everyone here.
My Nook is where I want it to be currently with the latest CM7 stable.
It seems like everyone is overclocking and now I'm curious.
Do you guys keep the overclock on the entire time you're using the nook? Or do you turn it on when you need the extra performance?
Does it shorten the battery life by much?
Is it harmful at all to the hardware?
Click to expand...
Click to collapse
Good questions. Overclocking is, on the surpface, something one would imagine harms our toys. Actually, most can handle well. It's all about the voltage and not so much anything else. Dal and others have worked out the tough stuff and provided us with some extremely useful kernals that noticably increase speeds (demonstrable with apps like Quadrant Standard or Smartbench) Apps run quicker and the overall experience is sweeter. Ondemand is the usual govenor I employ set on boot. (Running CM7.0.2 1.1 OC) Still getting a full day of use before recharging.

Usually it only kicks up to overclocked speeds when it needs it, cm7 can regulate it's clock speed pretty well depending on what setting you use.
technically overclocking will slightly shorten the life of the processor (uses more power, produces more heat). It doesn't really matter though as my battery will give out long before my processor, regardless of whether i overclock or not.
By that time i'll probably be thinking about buying the sweet new nook color 4 anyhow.

I have one of the handfull of Nook's that can run at 1.3 GHz, although I have it set to boot at 1.2 GHz to eliminate the occasional bootloop from trying to load up at max speed. Once booted I kick it back up to 1.3 GHz and leave it. My battery generally lasts 48 hours of light / moderate use with the display being the single biggest power hog.

48 hours of using seems impossible to me when I use my NOOK at work for FB and some little gaming (not 3D) and after 8 hours is at 50% of battery.
I use daily 300/1300 at On Demand and never had any problems with device.
Extra heat is harmful.So if the device isnt get so hot, then things are ok.

RASTAVIPER said:
48 hours of using seems impossible to me when I use my NOOK at work for FB and some little gaming (not 3D) and after 8 hours is at 50% of battery.
I use daily 300/1300 at Interactive and never had any problems with device.
Extra heat is harmful.So if the device isnt get so hot, then things are ok.
Click to expand...
Click to collapse
You're right 48 hours of use is impossible. To clarify.... I'm usually off the charger for about 48 hours... not 48 hours of use. I'm 20 hours off charger now, wifi running about 10 hours, screen on for 2 hours 24 minutes and battery at 53%.

hockeyfamily737 said:
You're right 48 hours of use is impossible. To clarify.... I'm usually off the charger for about 48 hours... not 48 hours of use. I'm 20 hours off charger now, wifi running about 10 hours, screen on for 2 hours 24 minutes and battery at 53%.
Click to expand...
Click to collapse
When does the battery meter reset? Is it when you charge the battery back up to 100%?
I just got CM7 working and haven't had a chance to go through the entire battery yet but based on what I've seen so far I can maybe squeeze out 5-6 continuous hours of usage, does that sound reasonable?
Based on what I see it's significantly hungrier than the stock.

s52m3 said:
When does the battery meter reset? Is it when you charge the battery back up to 100%?
I just got CM7 working and haven't had a chance to go through the entire battery yet but based on what I've seen so far I can maybe squeeze out 5-6 continuous hours of usage, does that sound reasonable?
Based on what I see it's significantly hungrier than the stock.
Click to expand...
Click to collapse
Depending always on what U do during usage (different to play games or just browsing the internet), U should really have the hours U propose.
Soon the problem with the sleep will be solved and the autonomy will be back to normal.

[Q] Battery Life with CM7 Barebones

Hello,
I have received my Kindle 4 days ago. Rooted, backup-ed in the next hour and I installed CM7 Barebones edition, a very nice ROM.
After 2 days of intensive use, I found that the battery life in use is very reasonable, but in sleep mode without wifi, no sync and only the core services of android, i notice a 2% battery loss by hour. In the "battery use" menu in parameters, the process "when phone is idle" take me about 10% of battery. I intend to test with or without airplane mode and the battery consumption is about the same.
So my question for the other users of this rom : are you experiencing the same levels of battery consumption in sleep mode ?
Thank you by advance ...

PinguinKilla said:
Hello,
I have received my Kindle 4 days ago. Rooted, backup-ed in the next hour and I installed CM7 Barebones edition, a very nice ROM.
After 2 days of intensive use, I found that the battery life in use is very reasonable, but in sleep mode without wifi, no sync and only the core services of android, i notice a 2% battery loss by hour. In the "battery use" menu in parameters, the process "when phone is idle" take me about 10% of battery. I intend to test with or without airplane mode and the battery consumption is about the same.
So my question for the other users of this rom : are you experiencing the same levels of battery consumption in sleep mode ?
Thank you by advance ...
Click to expand...
Click to collapse
Honestly haven't tired the Bare Bones ROM but I have the WhistleStop CM7 ROM and the Skimp Killah Super Kang CM7 ROM and both are great. I know Whistlestops version gets great battery life with almost no drain in sleep mode. I can sleep all night and only lose 1% with it. Just trying out the SKSK. I'll let you know.

I personally have not extensively tested the battery life of the rom I built (CM7 barebones). I do know the battery for me has no problem lasting a full day, which is fine for my need's. You could always flash over the stock kernel (which I will attach to this post) and compare the two. The current kernel in use is a intersectRaven build (20120110_1106 I think but am unsure). It is still being developed so battery life will likely just get better.
But anyway. Check the attachments on this post for the stock CM7 kernel built 02-01-2012. Also note, the stock kernel is not overclocked. It's default speed is 1008Mhz, where as Raven's is set to 1.2Ghz.

Ok ... indexa question for the whistletop rom, do you put the kf in airplane mode ? When i did not it seek for a signal and eat some power ....
Sent from my Kindle Fire (CM7).

Takenover83 said:
I personally have not extensively tested the battery life of the rom I built (CM7 barebones). I do know the battery for me has no problem lasting a full day, which is fine for my need's. You could always flash over the stock kernel (which I will attach to this post) and compare the two. The current kernel in use is a intersectRaven build (20120110_1106 I think but am unsure). It is still being developed so battery life will likely just get better.
But anyway. Check the attachments on this post for the stock CM7 kernel built 02-01-2012. Also note, the stock kernel is not overclocked. It's default speed is 1008Mhz, where as Raven's is set to 1.2Ghz.
Click to expand...
Click to collapse
I've notice a similar thing with the battery life. Prior to this ROM I was using whistletop's ROM with no battery loss while the device was sleeping. So as Takenover83 indicated, it's more likely to be an issue with intersectRavens kernal.
No problem, I can live with it for now. I love the responsiveness of this ROM, Thanks Takenover83.

I left my device alone for a little over ~10.5hours. Only thing I turned off was wifi. Note, I have a crap load of app's installed.
After 10 hours, I had 90% battery. So that's roughly 1 percent per hour, which I can live with. This was On Demand 300/1200.

Yeah I noticed a significant drain in battery loss. This morning my kindle was completely dead and when I got it charged I had some serious problems. It seemed wifi stopped working. I was able to connect but none of my google apps couldn't connect.

Post your CM10 BASED ROM battery life! And some tricks and tips

I saw a similar topic in the atrix section and it looks very useful, so I searched the samsung forum but found nothing. Therefore I created this. Feel free to post your CM10 based rom battery life.
This is more for trouble shooting and sharing tips and tricks to extend the CM10 battery life. Also post some screenshots to show us your battery life, one of tour screen on time and one for your overall usage

Thebyani ROM 4.1.1 very good battery life.
Inviato dal mio GT-I9100 con Tapatalk 2

Testing RRemix

I get a drain of 4-5% per hour on CM10 which isn't normal. According to BBS I don't see any excessive wakelocks, also battery stats in settings shows phone sleeping.
I tried a lot of different things to see if the drain reduces. Finally when i changed 3G to 2G the drain reduced.
I know 3G consumes more battery than 2G, but this drain was excessive and nothing like I saw on Stock or CM9 ROM's.

I'm using PA 1.98 and Siyah 4.0.1. I feel this is a very good combination in terms of battery life and performance.
On a full charge, I easily get around 20hrs on medium-heavy usage. I used Lux AB to control brightness and VC just for reference to check on deepsleep and cpu states. I also used battery widget reborn beta for its cool stats and auto flight mode control. Disabled all haptic feedback and vibration alerts cos I could just use a low-volume profile. Disabled hardware keys backlight(if i can find the home button in the dark, no prob finding the rest)
Edit: I use stock 1650mah battery
In extweaks, I set battery profile with the following settings:
CPU
Gentle_Fair_Sleepers - on
arch_power - on
CPU Hotplug (default)
CFS - Linux kernel defaults
CPU Idle - AFTR+LPA
Smooth scaling - 800MHz
Dual core mode
Sched_MC - 2
CPU Undervolting - -50mV
CPU Step Count - 18
Default Governor - ondemand
Scaling_Max - 1000000Mhz
Scaling_Min - 200000Mhz
GPU
Freq Step 1 - 40MHz
Freq Step 2 - 133MHz
Freq Step 3 - 267MHz
GPU Voltage 1 - 850mV
GPU Voltage 2 - 900mV
GPU Voltage 3 - 950mV
Thresholds - all defaults
GPU Staycounts - 1,1,1
Audio
Optional - I set to 3
Screen
Sensitivity - 3pixel
min_bl - 0
min_gamma - 0
max_gamma - 24
gamma shift - 0
vibration intensity - 0
mDNIe Negative Toggle - on
BLN
I don't need it so disabled
Misc
Android Logger - on
Scheduler - sio
Zram size - 150mb
charge current - option 2
USB Mass Storage Mode - Force MTP Mode
Exclusive Wakelock Stats - on
Autoinstall root - off

atulalvenkar:
Try Dream kernel:
http://forum.xda-developers.com/showthread.php?t=1788021
I have very good battery life with version 2.7.0 and CM10, but USB Mass storage isn't working. Also you can try newest Siyah.

atulalvenkar said:
I get a drain of 4-5% per hour on CM10 which isn't normal. According to BBS I don't see any excessive wakelocks, also battery stats in settings shows phone sleeping.
I tried a lot of different things to see if the drain reduces. Finally when i changed 3G to 2G the drain reduced.
I know 3G consumes more battery than 2G, but this drain was excessive and nothing like I saw on Stock or CM9 ROM's.
Click to expand...
Click to collapse
Yes, I experience the same. 3G draines the battery and much more than on any other ROM I ever used.

My battery is no better or worse that on other roms, i loose about 15% of battery an hour with half an hour use or so. Any screenshots anyone? Or tips, did anything improve your battery??

i using CM10 ,the battery consumption still bad compared to stock rom ICS..so,no different to me,LOL

Tiaso said:
i using CM10 ,the battery consumption still bad compared to stock rom ICS..so,no different to me,LOL
Click to expand...
Click to collapse
Which kernel do you use ?

atulalvenkar said:
I get a drain of 4-5% per hour on CM10 which isn't normal. According to BBS I don't see any excessive wakelocks, also battery stats in settings shows phone sleeping.
I tried a lot of different things to see if the drain reduces. Finally when i changed 3G to 2G the drain reduced.
I know 3G consumes more battery than 2G, but this drain was excessive and nothing like I saw on Stock or CM9 ROM's.
Click to expand...
Click to collapse
I get that in every ROM, even stock. I get half decent battery life now, deleted battery stats this morning so gona see how it goes tomorrow. It almost got me through the day though. I'm using extweaks to under volt my phone
Sent from my GT-I9100 using xda premium

MikeIliescu said:
I get that in every ROM, even stock. I get half decent battery life now, deleted battery stats this morning so gona see how it goes tomorrow. It almost got me through the day though. I'm using extweaks to under volt my phone
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
A drain of 8-10% per hour if you actively use is fine. But while sleeping my usual drain on stock /CM9 is about 1-2% per hour.
I think due to all the hacks that are required currently to get CM10 working with ICS closed binaries we have this battery issue.IF it was
an app BBS would have shown, if my phone had deep sleep issues, cpu spy should have shown but I don't get anything in either of these.

CM10 on Galaxy S2
I'm running the latest CM10 nightly build (20120906) for my Galaxy S2.
The ROM works blazingly fast and I haven't had any bugs as of yet :victory:
The battery life is quite poor however, I get around 11 hours from full battery to nearly dead with moderate-light usage.
Today I used Google Navigate with GPS and 3G for around 15 minutes and it chewed through around 15% in just 15 minutes :crying:
I really hope they fix the battery life as its the only thing holding this ROM back.

This was my rom drain on standby with cm10 pretty good in my opinion
Sent from my GT-I9100 using xda premium

shaunnicho said:
This was my rom drain on standby with cm10 pretty good in my opinion
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
That's pretty awesome. Care to share the build and if you did something else (other kernel, settings, anything)?

my phone has battery problem with CM10 too
battery dead 2x faster than CM9 Rom
specially when use Wifi or GPS
i never had my phone for more than 20 hour

I am using CM10 nightly 20121017. I have switched to CM10 nightly builds since two weeks. Before I was on stock 4.0.3 Greek Vodafone. Also I have tried a lot of custom ROMs.
In conclusion: with 3G on, WiFi keep alive, gmail, push exchange mail and all other notifications off (eg Facebook), all touch vibrations off, from 8am that I unplug the phone, it lasts max until 5pm. And this is Almost the same with all roms. :thumbdown:
This is a smartphone and in order to operate as a smartphone of consumes a lot of energy! I can get a Nokia 6310 to have just a phone that lasts for a week...
My opinion is that someone must produce better batteries!
Sent from my GT-I9100 using xda app-developers app

I hardly get a day of battery life. The most efficient battery saving technique which I realised was to put your phone into airplane mode when not in any use. I put my phone to airplane mode while I am asleep or I am attending classes. Amazing battery saving technique.
Other thing we can do is to use a cm10 version of rom with the memory leak issue fixed. If its not, you might even need to charge your phone even twice a day.
Disable 3G(use 2g only mode) when not using the web. 3g sucks a hell lot of battery.
Sent from my GT-I9100 using xda app-developers app

at the moment testing RR-Rom 3.0.9. Awesome smoothness and battery-life
best ROM so far :good:

Easy when you know what you're doing
http://forum.xda-developers.com/showpost.php?p=33094821&postcount=11815