Database Develop

[Q] Battery still draining quickly

Hey guys,
Since changing firmwares and kernels etc; my battery has been going flat even quicker then at stock. I can understand this seeing as I have my device overclocked to 1.2GHz; but the thing is that it's draining WHILE THE DEVICES IS NOT IN USE. EG. While it's sitting idle with the screen off.
Now, I do have facebook/twitter/weather/news set up to refresh, but only every hour and on Twitter ever 3 hrs, so I don't think this is the case. I also have a profile set up on SetCPU which when the screen turns off, it sets the CPU to Min: 100MHz & Max 100MHz.
On the Battery usage screen it looks as if the screen is using up ~70% of the battery.
Here's my setup:
Samsung Galaxy S GT-I9000
I9000XWJM8
SamSet 1.9f
1.2Ghz OC /w Voodoo 4 & BLN

Hey
I had the same issue with my SGS. My setup was stock JF3 plus voodoo lagfix 3.0. Phone was fast but battery drained very quickly, and didn't stop when it was on standby. I suspected the custom kernel that was included in the voodoo lagfix.
I have since flashed JM8 to my phone and used the lagfix found on xda under
[Voodoo Lagfix] : Play Voodoo with STOCK ECLAIR kernels! - FINAL
which is like voodoo lagfix but with JM8 kernel instead. I'm now enjoying a fast SGS with very good battery life.
Cheers

Thanks for the reply.
It could quite possibly be SamSet 1.9f doing the draining; but I'm not sure.
I don't think I could go back to stock after using SamSet anyway; that thing is just incredible

I might have to give it a try. Although I still stand by voodoo giving you the battery issues.

They say it was Version 3 of Voodoo which was giving the battery problems - wait, that was the OC kernel wasn't it?
Not sure; it should be fairly noticeable to everyone when the screen off function is not putting the phone in stand-by mode!

When I had the issues I used Voodoo lagfix 3.0 which is a part of Voodoo beta 4. They said there were battery issues in Voodoo beta 3 (this contained Voodoo lagfix 2.1). I have read a lot of reports of people winding back to Voodoo beta 2 and not having battery issues.
I think all the Voodoo versions have all used OC kernel.

JM8 and voodoo combined cause battery drain. Use other lag fix or firmware...
Sent from my GT-I9000 using XDA App

Yeah, I noticed a significant increase in battery drain after installing JM8 + Tayutama's 1.1 ROM w/ Voodoo.
Although I really like the increased speed and Tayutama's add ons, the battery drains almost twice as fast compared to the average during my previous month using the phone with stock I9000DTJG4 firmware, which to me is pretty awful.

there is a very big difference in battery life time. my setup us also JM8+Voodoo4.. I charge my foon every night. and when i'am eating dinner the battery is bleeping.. and there is actualy no active use..
I like the combination of JM8+voodoo.. it really feels great.. so what can we do..?

Well, I use JM8 with RyanZa 2.3 Lagfix and I don't have any problem with battery life.
Using mails (push), Games and MP3 about 2 or 3 hours per day, and battery is at 60% at the and of the day.
Not bad isn't it ?

Same problem here , i have JM8 with Tayutama & Voodoo lagfix , my battery drains like hell ^^

hmmm i noticed yall talked about a fast battery drain using the voodoo lagfix
could it by any way be the latest 1 (V4 beta) ? coz on the website and i quote
" Bugfixes :
The battery life issue introduced in beta3 is resolved. CPU was locked at 1GHz, which some people saw as a feature (snappier Phone!) but in reality this was a bug, sorry guys "
so V4 beta should be a fix and not suck up much battery like V3 beta
as for myself my phone was a First Gen i9000 international version and ever since i got my phone it never lasted a full day of use....
except for when i changed 3g to 2g , disabled the internet apn , disabled the auto sync , pretty much disabled everything and went very low on the screen light and yet ended @ 10-11 pm with 2% battery life with a max talktime of an hour thruout the day and screen was off almost all of the time except when viewing sms's , yes it lasted a full day to me but i sure hate using my phone that way, pretty useless T_T

mazroui said:
hmmm i noticed yall talked about a fast battery drain using the voodoo lagfix
could it by any way be the latest 1 (V4 beta) ? coz on the website and i quote
" Bugfixes :
The battery life issue introduced in beta3 is resolved. CPU was locked at 1GHz, which some people saw as a feature (snappier Phone!) but in reality this was a bug, sorry guys "
so V4 beta should be a fix and not suck up much battery like V3 beta
Click to expand...
Click to collapse
Thanks for the suggestion, but Tayutama's 1.1 ROM is supposed to include beta 4.
I've got the international version as well and usually got 2, sometimes 3 full days usage with the stock firmware (with about 2 hours of browsing, 2-3 SMS's, 1-2 phone calls and 1 hr of music a day). I did my best to maximise battery life by switching my background wallpaper to be mostly black, and the phone set to minimum brightness
Ordinarily I'd be down to about 60-65% battery life after a day of usage. Using JM8 and Tayutama's ROM I'm down to 22% after 1 day...

It's really weird. Just a day or two ago, I reported having battery issues with the combination of JM8 + Tayutama + Voodoo b3 lagfix only.
Today, I unplugged my phone in the morning (approx 08:30) after an overnight charge, rebooted it just in case, and have been using it quite heavily. Lots of 3G data and Wi-Fi (I hear Wi-Fi is a culprit in some cases), a few phone calls, SMS, and music. I have brightness set to low, and black backgrounds where possible.
It's now been more than 12 hours of operation, and not once have I had the rapid battery drain and excess heat that I had complained about. Or wakelocks, now that I think about it. Remaining charge is roughly a third. I actually don't mind; I'm of the belief that smartphones need a daily charge anyway.
But the heat problem. It didn't happen today. I don't know why. In fact, I don't even know what caused it. I'm glad it didn't happen, and hope it doesn't again, but it's just very very weird. :?

With JM8 (Tayutama Edition v1.1) voodoo + OC my battery draining very very quik.
I have applied update.zip "[Voodoo Lagfix] : Play Voodoo with STOCK ECLAIR kernels!" and now batery life is very good.
P.S. = to applay update from Tayutama voodoo to STOCK kernel + voodoo LagFix i don't disable lag fix before or other ... just update kernel over it ... of course i lose OC but now my SGS work like a charm and batery life is very very good

I just flashed back to stock from Voodoo 3.0. If you go to the dedicated Voodoo thread, you'll have people complaining about the battery life while others try to dispel the rumor that Voodoo is the cause. I fully believe it's Voodoo. Since flashing back, I have the exact same setup I had before {done from scratch} while using OCLF instead. Battery is fine now.

mazroui said:
as for myself my phone was a First Gen i9000 international version and ever since i got my phone it never lasted a full day of use....
except for when i changed 3g to 2g , disabled the internet apn , disabled the auto sync , pretty much disabled everything and went very low on the screen light and yet ended @ 10-11 pm with 2% battery life with a max talktime of an hour thruout the day and screen was off almost all of the time except when viewing sms's , yes it lasted a full day to me but i sure hate using my phone that way, pretty useless T_T
Click to expand...
Click to collapse
man this is almost the same behavior i have with my phone. It can last one day (around 25-26 hours) only when i disable everything, put the brightness to the lowest level and pay attention to the apps running in background, this with low/moderate usage (2-3 hours display on, few calls or sms). My phone drains battery as hell.

I guess there is some Calibration Problem when you are flashing a new firmware. Try to flash a new firmware with full battery.

Just went and disabled my current Voodoo b3 and installed the Stock Kernel Voodoo... (Checking each way with a Quadrant bench.)
My battery suddenly went from 26% (curio's Voodoo) to 65% (stock Voodoo). wtf. :s
I totally need to refresh battery stats...

I've noticed a couple of times that my battery is around 40% and I restart my phone and it jumps to 75% w/c I find strange, also 100 to 70% seems to to drop so fast and it stabilizes at ~60%

[Q] Battery Life on Froyo (Dream/Sapphire)

Simple Poll.
Have you seen a decrease or increase?

Someone can explain this battery drain?
in a lot of roms based on 2.2.1 there is a big battery drain, in some other there isn't.

nagash91 said:
Someone can explain this battery drain?
in a lot of roms based on 2.2.1 there is a big battery drain, in some other there isn't.
Click to expand...
Click to collapse
Reboot after unplugging from USB and battery drain is gone. For further improvement install SetCPU and reduce min/max frequency. I am getting more or less the same lifetime as with donut ROMs.

AndDiSa said:
Reboot after unplugging from USB and battery drain is gone. For further improvement install SetCPU and reduce min/max frequency. I am getting more or less the same lifetime as with donut ROMs.
Click to expand...
Click to collapse
OK I have done.. but the problem is that when I use it 3 o 4 minutes (for example I install an application using a file explorer, then I read a message and then I come back to home) m battery get 5% lower...
In standby I lose 10% in 6 - 7 hours (I think this is normal).

AndDiSa said:
Reboot after unplugging from USB and battery drain is gone. For further improvement install SetCPU and reduce min/max frequency. I am getting more or less the same lifetime as with donut ROMs.
Click to expand...
Click to collapse
I am currently without a computer therefore immune to this USB bug. I flashed CM6.1 to this and the other g1 and both suffered substaintial amounts of battery drain so I nandroid restored back to CSDIv4 and still the lowest frequencies and settings did little to combat the descending digits. So I tried this...
Recalibrated my battery
Flashed SuperWipe.zip
Reboot
Flashed SparksMod's latest
Reboot
Wiped battery stats
Unplugged...reboot
Battery lasted 23 hours the first day never seen anything like it.
Lifes great.
Sent from my HTC Grandaddy via XDA app
Sent from my HTC Grandaddy via XDA app

I'm using TMUS-G1-Froyo CM6 remix..
and I'm using the new radio with +14mb.
The rom flies but the battery go down too fast.
I'm using setCPU with 256 - 528 mhz while screen is on, 122 - 256 mhz while screen off.
If I go to battery use in settings I see
Cell standby 45%
display 28%
phone idle 22%
android system 3%
I don't think is normal... cell standby is the battery use by cell radio..
I wonder if the new radio give a big battery drain..

nagash91 said:
I'm using TMUS-G1-Froyo CM6 remix..
and I'm using the new radio with +14mb.
The rom flies but the battery go down too fast.
I'm using setCPU with 256 - 528 mhz while screen is on, 122 - 256 mhz while screen off.
If I go to battery use in settings I see
Cell standby 45%
display 28%
phone idle 22%
android system 3%
I don't think is normal... cell standby is the battery use by cell radio..
I wonder if the new radio give a big battery drain..
Click to expand...
Click to collapse
I got real excited when I heard about the new radio and hboot even thought that its exclusion was the source of the the battery issues. Haven't been able to try it as I'm without a up-to-date PC at the moment.
It would be real nice if I could find a seasoned dev who understands battery consumption. I thought the kernal was the main culprit but I've tried two different roms with the same kernal and one has notably better battery life than the other. So confusing.
Sent from my HTC Grandaddy via XDA app

I can't use my phone with this battery drain...
I will come back to official android OTA-AOSP 1.6.. with +14mb.
So I'll test if this kernel with 14mb is a cause of battery drain.
PS: I'm not a lover of rom customizations.. I think the official roms are the best.
The other are all too heavy. I'm not a fan of cm kernel, that is too heavy for g1.
I would see an official OTA 2.2 without customizations, so every one could customize as he want, and if he want.
PS: OK I flashed AOSP 1.6 using ezBiff_kernel to have 15mb (cause I have new radio and spl, so I can flash roms only using this kernel).
Result: my battery life is similar to froyo 2.2 roms... so the problem is:
1) Kernel? (ezBiff_kernel is based on cyanomod kernel... ... ... heavy as death)
2) New radio/spl?
3) My battery (I don't think so.. it's new battery. I buy it 2 weeks ago and in the beginning it works so well.. but then I flashed new radio/spl and new kernel for 15mb..)

nagash91 said:
1) Kernel? (ezBiff_kernel is based on cyanomod kernel... ... ... heavy as death)
Click to expand...
Click to collapse
Come now.. the cm pershoot kernels are super optimized so they don't collapse under the heavy as death rom that is usually on top of it..
I get mixed results with that kernel between testing and feedback.
A test phone can idle on wifi+2g for days on the stock g1 battery even after a usb unplug.. but on more common use with syncing services its not performing as well as I'd like..
Some of it is fixed with less swap/compcache or changing clock speeds 122/480 for most the speed but lower voltage levels. Also the interactive governor may work better.. I'm testing these ideas if results are good my next kernels defaults will use them.
Cm/pershoot have some interesting new power management code from other htc devices.. So hopefully soon all will be better. (I merged most of it to my kernel but there are some loose ends.. works well untill the phone locks up.. so no public release yet)

ezterry said:
Come now.. the cm pershoot kernels are super optimized so they don't collapse under the heavy as death rom that is usually on top of it..
I get mixed results with that kernel between testing and feedback.
A test phone can idle on wifi+2g for days on the stock g1 battery even after a usb unplug.. but on more common use with syncing services its not performing as well as I'd like..
Some of it is fixed with less swap/compcache or changing clock speeds 122/480 for most the speed but lower voltage levels. Also the interactive governor may work better.. I'm testing these ideas if results are good my next kernels defaults will use them.
Click to expand...
Click to collapse
Ok sorry I talk without knowledge. I really don't know the effect of the cm kernel. I only know that all roms based on cm release, with cm kernel, are so heavy and slow.
I like your rom (2.2.1 AOSP) and I love your new way to get 14mb.
But I have this orrible problem. My phone has a lot of battery drain when I use it. With screen off, no problems.
I have never used swap or compcache in this days, and I also try different clock speeds (not over 528mhz).
The result is that when I unlock my phone, I go to settings, I see for example 95% battery. Ok, I return to home, I open a message, I return to home, I open contacts and I scroll some contacts without make calls.
Then I come back to battery settings and I see that is 92-93%..
in 2 minutes of soft use.. I think this is impossible. If I open stupids 2D games... ahah in 5-10 minutes my battery lose 10 - 20%.
I remember 1 year ago, with 1.6 (no cyanomod) my battery was good.
Now it isn't (I have a new battery).
Today I flashed aosp 1.6 with your kernel for 14mb (I have new radio&spl) but nothing... I lose a lot of battery percent as in froyo.
So I think problem is or battery calibration, or something to wipe, or cm kernel, or new radio&spl + your new kernel...
Now I'm recalibrating battery (is at 1% from 2 hours, I'm not using it.. ) then I will recharge for 8 - 9 hours and then wipe battery state, but I have done this process a lot of time without a benefit.
I'll try to remove the new radio+spl (so also using standard kernel) if my battery continue to lose percents so fast.
I'll keep you update on my "story".
PS: Sorry for my bad english!! XD

OK.. after a day of low discharging and a night of 8 hour of recharging, I wiped battery states, I wiped data-cache-ext ecc... I flashed aosp 1.6 and ezbiff kernel..
"battery drain" continue...
I will try tomorrow to reflash death-spl and old radio..
BTW, is normal for hours battery 4v at 90%?
On the back of the battery sais 3.7v... I thought 3.7 was the voltage for 100%

Update
I know this thread is a little old, but I ran into this problem as well. What I found was that the official US radio (2.22.23.02) used considerably more battery than the international one (2.22.19.26i). The other thing I noticed is that switching to "use 2G networks only" in mobile networks settings and disabling data over mobile drastically improved battery life.
I also noticed that wifi used a fair bit of juice so my recommendation is to disable wifi if you're going to be on the go for a bit, and disable data/3g if you're just going to be hanging out in the local webcafe, your/a friend's house, or some other location with wifi access for a while.
If you wanted to be ambitious and cared enough you could write a script to use as a shortcut on the home screen to do the swap automatically (detect which setting(s) are enabled and swap them to the opposite).
With those changes, you should get much better battery life. My thoughts on different Froyo flavors is that possibly different builds have different settings by default. Cyanogen comes with data and 3g enabled by default so this will quickly suck out your battery if you're running your 3g, 2g and wifi antennas all at once.
The stock build (1.6) got about the same battery life as I'm getting now with those settings applied. With either build, having all antennas on all the time will drain your battery very rapidly. Being a little more cognizant of the settings (perhaps you also had it set to 2g only on the stock build) you're using will significantly improve your battery life. And when I say significantly, I mean night and day (but the antenna version definitely does also make a difference... at least in my case).

[Q] Firebird 2-0.8 and wifi bettery drain fix.

Can we use update-wifi-xxjpy.zip, which suppose to fix wifi bettery drain issue, with Firebird 2-0.8?
I am running perception ROM, Firebird 2-0.8, and JL2 modem. I notice that, wifi would take a lot of battry life. If I turn wifi off, the bettery level is almost not changed. I did research and lead me to this post
http://forum.xda-developers.com/showpost.php?p=10056736&postcount=6706
which have the new wifi firmware. The post mentions update kernel, but really
not specific. I am not sure that the wifi firmware would work with FB.
Thanks.

I found this post. It's very helpful.
http://forum.xda-developers.com/showthread.php?t=885903

you might wanna just try and reflash the kernel because i get awesome battery with firebird along with most others

yes,I did try, and I am please with the result. Last night, I flash new wifi farmware, and leave the phone idle. I lose 1% overnight. So, it's work. and +1 on battery life of FB.
Power by Perception 10.3, FB2-0.8, KP1

Holy frick! 1 % over night ! Try 10% ? That's what I lose over night, everything off besides network.. Firefly+ Firebird+JL4 ... tried many a rom and modem and longest i;ve made it with small usage and few texts is 10 hours , hardly any usage.. Not sure what is up. Hating it.

JFX said:
Holy frick! 1 % over night ! Try 10% ? That's what I lose over night, everything off besides network.. Firefly+ Firebird+JL4 ... tried many a rom and modem and longest i;ve made it with small usage and few texts is 10 hours , hardly any usage.. Not sure what is up. Hating it.
Click to expand...
Click to collapse
I had a similar experience with the Firebird 2 kernel also. My battery would be drained before my 6:00am alarm would go off. Ever since going to the Speedmod kernel, I get around 22-24 hours of battery life. I believe my phone just jives better with Speedmod.

where can I find JL2 modem? (one that I can install using rom manager)

There are several modem threads over in the development forum. They have links to most of the modem updates. This one has the JL2 modem.
http://forum.xda-developers.com/showthread.php?t=876391

[Q] Darkys 9.5 Wlan causes Battery Drain

Hey guys,
the day before yesterday i flashed Darky's 9.5 on my phone.
This is the first Darkys version for me. The flashing was fine and very easy but then i got big problem regarding the Wlan battery use.
First i tell you how i flashed Darkys, perhaps i did a failure here.
1) First i flashed Darkys Reserrection Version on my phone
2) After that i configured the Darkys App from the market and flashed the reserrection.zip with CWM
3) At the end i flashed Darky's 9.5 with CWM
Now the points regarding my problem.
Yesterday night i switch off my phone with at least 85% battery. I switched off GPS,Bluetooth and i deactivated the data transfer mode for UMTS. But it was my intention to test the battery drain with active WLAN, because with the original T-Mobile Firmware the phone uses circa 25% battery a night.
But when i woke up i was really shocked. My phone turned off and the battery was complete empty. In this night the battery drained 85%. How is this possible? There were no apps running excepting the Advanced Task Killer.
Did i something wrong? (When i flashed the battery was fully charged)!!
//edit
Here are my settings:
PDA: I9000XWJS8
Phone: I9000XXJVE
CSC: I9000XXJS1
Kernel: DarkCore 1.0

I wouldn't think this was a common issue. Have you tried just re-flashing the ROM again via CWM? Maybe try the same thing again?

Thx for your answer.
Yeah i even think that it's not a common issue.
I will watch the battery this night. If the bug occurs again, i will flash the Rom with CWM again. Have i to disable the lagfix or can i do it on the fly without changing something in the current system ? If yes, where?

my battery is the best its been in a long while since using this rom so i wouldnt dismiss it just yet. what modem are u using?

I use the modem Darky's App Configurator has recommend (JQ1 but i have read that JVE is flashed (se my settings above)). But i think I will try flashing again. This night the battery drops from 100% to 47% with the same settings I mentioned above. Then i watched the battery usage, but they were strange.
Wifi and "Wifi using" uses 100% cause they were running the whole time. But the category "execution" used 75%, so the phone did not drop into sleep mode for about 75% of the whole night? How is this possible? I checked all my 3rd party apps I installed on my own and they don't have a setting to manage this.
Does one app of Darky's Configurator do this?

Well Darky can answer question best .
Me i blame the rom change the rom .
jje

Now i flashed Darkys 9.5 with wipe again.I will watch the battery drain and I will notify you about the result.
//edit
Now I go asleep and I will report tomorrow if the flash was successfull. But I got one question left:
By accident I saw in the wireless setting window that my phone scans every 5 seconds for new devices, even if its connected to my own router. (If the phone goes to standby the WLAN does not scan cause of my settings). But why das it scan every 5 or 6 seconds, even if it's connected to my own device?? Is it possible to increment the scan time?

Good morning guys,
here is my update:
I think the reflash worked. Last night my phone uses 10% battery with wifi and data transfer on, gps and bluetooth off. I think this is a good value.
By using the flightmode the next times I will save some more
Now there is the question left regarding the number of wifi scanns. (see the post above). Is it modifiable ?

smudgy456 said:
my battery is the best its been in a long while since using this rom so i wouldnt dismiss it just yet. what modem are u using?
Click to expand...
Click to collapse
If you don't mind me asking: what modem do you use? And how long does your battery usually last for?
Thanks

mister-viper said:
I use the modem Darky's App Configurator has recommend (JQ1 but i have read that JVE is flashed (se my settings above)). But i think I will try flashing again. This night the battery drops from 100% to 47% with the same settings I mentioned above. Then i watched the battery usage, but they were strange.
Wifi and "Wifi using" uses 100% cause they were running the whole time. But the category "execution" used 75%, so the phone did not drop into sleep mode for about 75% of the whole night? How is this possible? I checked all my 3rd party apps I installed on my own and they don't have a setting to manage this.
Does one app of Darky's Configurator do this?
Click to expand...
Click to collapse
Did you recalibrate your battery after upgrading to Darky's 9.5?
It is recommended that u recalibrate your battery when you flash a new ROM.

You shoukd recalibrate your battery, i.e. drain it, turn off your phone and fully charge it, completely drain it (use it heavily). Then charge it again and voila, recalibrated!
Also, I find that after flashing a new ROM the battery drains really quick the first 2 times I charge it, before actually working as it should. So it's not that strange that your phones battery was dead in the morning. But I think this also has to do with recalibrating the battery.
Darkys v9.5 has a battery life of 3-4 days for me (not heavy usage) so it should be better after recalibrating your battery!
Sent from my GT-I9000 using XDA Premium App

Battery drain after LRK update ? (+ downgrading)

Is it easy to roll back to the previous LRG update as the battery seems to drain pretty fast on this firmware, LRG was pretty much perfect for me as I'd lose 3-4% battery overnight from a full charge but this has lost 15% in the same amount of time.
18hrs since fully charged
76% left (24% gone in 18hrs)
7mins screen time
Deep sleep for 16hrs

It's funny your getting this issue as I have the exact opposite experience with what your getting at. I was with stock Open Germany LRG before, and using that firmware.. I lost about 17% drain after a full charge overnight using it. When I changed Rom to LRK (and installing the latest speedmod kernel), now my phone's overnight battery % goes 1% every 4 hrs.. not bad right? I think you can try exploring other options like flashing kernels first (try speedmod) and see if there's some considerable differences (or not) with your phone's batt life.

Which way did you use to get LRK? On which kernel are you? Which ROM? Do you notice other bugs? (apps that freeze, wifi/gps not working...)
It seems that you have the deep sleep issue, but what's surprizing is that you get it by upgrading... ^^'

letters_to_cleo said:
It's funny your getting this issue as I have the exact opposite experience with what your getting at. I was with stock Open Germany LRG before, and using that firmware.. I lost about 17% drain after a full charge overnight using it. When I changed Rom to LRK (and installing the latest speedmod kernel), now my phone's overnight battery % goes 1% every 4 hrs.. not bad right? I think you can try exploring other options like flashing kernels first (try speedmod) and see if there's some considerable differences (or not) with your phone's batt life.
Click to expand...
Click to collapse
hmm, what's special about the speedmod kernel and is it at all risky to flash it ?
Seyhan60 said:
Which way did you use to get LRK? On which kernel are you? Which ROM? Do you notice other bugs? (apps that freeze, wifi/gps not working...)
It seems that you have the deep sleep issue, but what's surprizing is that you get it by upgrading... ^^'
Click to expand...
Click to collapse
Flashed via mobile odin, the kernel is as follows 3.0.15-N7000XXLRK-CL811902. I haven't noticed any bugs thus far. Seems to go into deep sleep according cpuspy

mug2k said:
hmm, what's special about the speedmod kernel and is it at all risky to flash it ?
Flashed via mobile odin, the kernel is as follows 3.0.15-N7000XXLRK-CL811902. I haven't noticed any bugs thus far. Seems to go into deep sleep according cpuspy
Click to expand...
Click to collapse
The changelog and functions of speedmod are here : http://touristinparadise.blogspot.sg/2012/01/samsung-galaxy-note-speedmod-kernel.html
I really recommend it, it feels really smooth, and drains less battery imho. And CWM and superuser are included.
All flashes have a risk (but it's minimal), this kernel is known to be safe (you can wipe data/factory reset = MMC superbrick-proof)
In battery settings, what drains the most your battery?