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Battery draining too fast after flashing new ROM

I dowloaded and flashed my HTC Evo 4g with Kings Ultra froyo Unleashed
and is an amizing rom. Everything works!!
But the battery drains faster than a boat sinks. Drops 10% every 12 minutes!!
The developer gave me a few pointers, i switch kernels but wich one should be the right kernel?
I thought flashing a rom will help the battery life.
Wifi off
4g off
sync, only what i need
dim light to only 10%
and still...
any suggestions?

Have you tried changing overclock speeds? A lower minimum speed for example and a different governer. I use smartass, with settings of 19/614 and it helped a lot after I had problems similar to you.

[Q] Can LTE really be this damning to battery life?

Of course I've read dozens of individual's reports of their own personal battery experiences with their phones, but the basic conclusion I've come to is that I simply cannot run this device with LTE enabled at all times. I have great 4G coverage in my area and while speeds are fantastic, my phone is imperative for my push notifications so I have a corporate email client running using data constantly, and making it impossible for me to disable background data.
das BAMF Remix 1.6.3
Adrynalyne's cf_2.0, smartass, 1024000 max
245760: 775
368640: 825
768000: 900
1024000: 975
I went through the process of freezing EVERYTHING non-essential and removing all widgets except the Sense home clock. With LTE enabled I got 6 hours of battery life at best, with moderate usage; I would be at about 60% by the time I got to the office in the morning.
Under same conditions with only 3G enabled I can get 17 hours without much difficulty and that usually includes playing a few games during downtime.
Am I just doomed to use 3G-only in order to maintain data persistence? If Tasker had support for toggling 3G-only and 3G/4G-auto I would be such a happier boy as I could then only turn on 4G on-demand, but at this point it's too cumbersome.

spuniun said:
Of course I've read dozens of individual's reports of their own personal battery experiences with their phones, but the basic conclusion I've come to is that I simply cannot run this device with LTE enabled at all times. I have great 4G coverage in my area and while speeds are fantastic, my phone is imperative for my push notifications so I have a corporate email client running using data constantly, and making it impossible for me to disable background data.
das BAMF Remix 1.6.3
Adrynalyne's cf_2.0, smartass, 1024000 max
245760: 775
368640: 825
768000: 900
1024000: 975
I went through the process of freezing EVERYTHING non-essential and removing all widgets except the Sense home clock. With LTE enabled I got 6 hours of battery life at best, with moderate usage; I would be at about 60% by the time I got to the office in the morning.
Under same conditions with only 3G enabled I can get 17 hours without much difficulty and that usually includes playing a few games during downtime.
Am I just doomed to use 3G-only in order to maintain data persistence? If Tasker had support for toggling 3G-only and 3G/4G-auto I would be such a happier boy as I could then only turn on 4G on-demand, but at this point it's too cumbersome.
Click to expand...
Click to collapse
Huge *NOTE!*
Go to settings, menu, wireless networks, mobile networks and uncheck the third box. No need to have mobile data always on for most peeps . You'll still have 4G n everything, but gain a good 1-2 maybe more hrs (depending on use, kernels, governor settings, and I/O scheduling. I personally am running BAMF 1.6.2 with adryns 4.4.7 kernel, no set CPU, using tool box for that at 245mhz min - 1.024GHz max with ondemand governor and most importantly SIO Scheduler. Try these n you will have amazing performance and better battery life. Let me know you opinions
Sent from my ADR6400L using XDA Premium App

Did you try lte only? I get 10-16 hours depending on use.
this is not a signature I type it in every time maybe sent from my phone or my computer

dopediculous said:
Huge *NOTE!*
Go to settings, menu, wireless networks, mobile networks and uncheck the third box. No need to have mobile data always on for most peeps . You'll still have 4G n everything, but gain a good 1-2 maybe more hrs (depending on use, kernels, governor settings, and I/O scheduling. I personally am running BAMF 1.6.2 with adryns 4.4.7 kernel, no set CPU, using tool box for that at 245mhz min - 1.024GHz max with ondemand governor and most importantly SIO Scheduler. Try these n you will have amazing performance and better battery life. Let me know you opinions
Sent from my ADR6400L using XDA Premium App
Click to expand...
Click to collapse
Yeah, I've read your post on this elsewhere already... since you did not read my post I will repeat that I cannot disable data persistence as I rely on my push notifications for corporate email. Second, my CPU settings are already arguably the most efficient they can be for both performance and power consumption.

rizzomegav said:
Did you try lte only? I get 10-16 hours depending on use.
this is not a signature I type it in every time maybe sent from my phone or my computer
Click to expand...
Click to collapse
Is that the last option? "LTE mode"
Won't this prevent 3G from working in non-4G areas? Also not an option, I need data service at all times.

I have it on 3g only and I use a radio switcher app. whenever i feel like browsin the web I just flip on LTE and turn it off when im done

Download LTE Switch to save your battery life
This free app LTE Switch was sent to me from a friend and it works great to toggle between 4G to 3G and saves my battery life everyday....
Google LTE Switch in and Android Market

LTE mode just drops it into roaming (turn roaming on under network connections) when it's out of range. You can always switch back to 3g if you know you need a faster connection after that.
Anyways, the saying goes "you cant always get what you want"

In my opinion its the search for 3g signal that is damning the battery life. I've always felt that the 1x to evdo transition was never fixed. Rather evdo coverage hid that problem.
If you set it to LTE only the transition to 1x from LTE is flawless and instantaneous when LTE signal is lost and vice versa. In addition, the battery life is much much better.
Sent from my ADR6400L using Tapatalk

spuniun said:
Yeah, I've read your post on this elsewhere already... since you did not read my post I will repeat that I cannot disable data persistence as I rely on my push notifications for corporate email. Second, my CPU settings are already arguably the most efficient they can be for both performance and power consumption.
Click to expand...
Click to collapse
I assume your corp doesn't use Exchange? I don't need mobile data persistence and I still receive push notification.

WillTheGreat said:
In my opinion its the search for 3g signal that is damning the battery life. I've always felt that the 1x to evdo transition was never fixed. Rather evdo coverage hid that problem.
If you set it to LTE only the transition to 1x from LTE is flawless and instantaneous when LTE signal is lost and vice versa. In addition, the battery life is much much better.
Sent from my ADR6400L using Tapatalk
Click to expand...
Click to collapse
Signal searching definitely wrecks batteries. At home with on very very light use, an hour of mostly idling takes maybe 1-2%. At work where signal is constantly at 0 to 1 bar (3g and 1x) it goes through 5-6%/hour just sitting there.

spuniun said:
Yeah, I've read your post on this elsewhere already... since you did not read my post I will repeat that I cannot disable data persistence as I rely on my push notifications for corporate email. Second, my CPU settings are already arguably the most efficient they can be for both performance and power consumption.
Click to expand...
Click to collapse
you don't need data persistence for push email to work(exchange/gmail/hotmail). It pushes and enables data as needed.

I figure I would add some feedback...
My original TB got the worst battery life ever. Even with the extended battery, I wouldn't make it more than 6-7 hours most... on a good day. That was running stock software, then BAMF remixed (Froyo).
I ended up having an issue with the phone, so I had them send me another one. The new one, completely stock, w/ extended battery, has been able to make it through the whole day without a single charge. The only time it didn't, was yesterday. For some unknown reason, something was dragging down the battery to the point where it only made it 10 hours and was completely dead before I was able to charge it.
Fast forward to today, and I am 81% capacity after 6 hours and a few phones calls, both on the handset and the bluetooth hands free in my Acura.
FWIW: I leave on WiFi, Bluetooth, GPS, have gmail checking mail all day, Exchange account for work (via Touchdown), auto-brightness, many updates throughout the day via Pulse newsreader, normal surfing using the Miran web browser.

I've run the following "tests" for my situation....
With 4G enabled, after an overnight charge, unplugging at 9am, my batter is down to 20% by 2pm. This is after using the phone for a few calls, some texts, heavy email, some internet browsing, youtube, and a little bit of friendstream usage.
Under the exact same usage, but only on 3G, at 2pm, I'm consistently around 65% battery remaining.
I've run this both ways (with 4G and without it) 3 times each now in the past week. Results are almost the same every day.
After this, I decided to put the LTE OnOff switch on my home page. I run through most of the day on 3G. I enable 4G only when needed (browsing internet, updating programs, watching youtube or other videos, etc).
It was a little annoying at first, but now its become routine habit and I dont even notice it anymore.

I live in a 4g area and I just have it set to just 4G and my battery lasts me long time.

[Q] Question about Kernels

Hi, my Triumph should be arriving in the mail in just a few days and i was wondering which is the best kernel or ROM and Kernel combination that is best for battery life? I've heard that battery life on the Triumph is not so good. Maybe it's false but i would still like to know.

jerenater10 said:
Hi, my Triumph should be arriving in the mail in just a few days and i was wondering which is the best kernel or ROM and Kernel combination that is best for battery life? I've heard that battery life on the Triumph is not so good. Maybe it's false but i would still like to know.
Click to expand...
Click to collapse
I would go with CM7

That's what i was planning on. Does your Triumph give you battery problems?

jerenater10 said:
That's what i was planning on. Does your Triumph give you battery problems?
Click to expand...
Click to collapse
The battery life is a lot better now with the latest builds of CM7 and MIUI.
I just use CM7 and leave wifi and bluetooth off, no juice defender or anything like that and I can easily go all day with no charge, typically about a day and a half and my battery is getting low but it really depends on what you are doing like games, wifi, videos and whatnot.
Before I think there was a problem with the battery draining while in idle but things have cleared up since then, There are also third party kernels you can OC and everything, but you can use them to undervolt as well to save some battery if you know what you are doing. over on androidforums there is a lot more chatter about this phone, just so you know.

ketjr81 said:
The battery life is a lot better now with the latest builds of CM7 and MIUI.
I just use CM7 and leave wifi and bluetooth off, no juice defender or anything like that and I can easily go all day with no charge, typically about a day and a half and my battery is getting low but it really depends on what you are doing like games, wifi, videos and whatnot.
Before I think there was a problem with the battery draining while in idle but things have cleared up since then, There are also third party kernels you can OC and everything, but you can use them to undervolt as well to save some battery if you know what you are doing. over on androidforums there is a lot more chatter about this phone, just so you know.
Click to expand...
Click to collapse
Thanks. I got my phone today and im loving it so far. Do you know which of those third party kernels are good for battery life and that i can install over stock? I'm not quite ready to install a ROM yet but i already did the HTC Thunderbolt Build.prop tweak and obviously im rooted.

It's usually not the kernel but whatever governor you have it set to use. Even the stock can get improved performance if you switch the governor to such--”performance”--but I'm probably not the guy to tell you about which one is best.
I also have the silly feeling a lot of misconceptions abound here...in the form of ”I changed this setting and now my device lasts longer..., oh btw I no longer play with it 24/7.” In other words, use drastically impacts battery performance. JuiceDefender is an amazing tool but it won't do you a bit of good if you're testing out your phone's Adobe Flash capabilities regularly.
Sent from my Wildfire S

The Savagezen and interactive (not sure if interactive is on any of the kernels for this phone.) gov isn't that great. At least not in my experience. I had SmartassV2 on my girlfriends phone and it got ~3600 on Antutu benchmark at 1.5 and when I used Savage at 1.5 she got ~1700. The interactive gov made my friends Dinc2 noticably slower. Just switching home screens it lagged to the point it was hard to get into the app to change the gov.

CM7 + TheOC kernel allows adjusting voltage & overclock or underclock. You really should flash a CM7 ROM. Having it just rooted can be dangerous because you're not using a custom recovery to make a backup image, and if something messes up, you don't have a backup ROM to restore. Going to a different ROM forces you to make a backup, then there's a backup to restore if you mess things up.
Governors just tell the CPU how fast to ramp up to a certain frequency, & how long to stay there. It's hard to balance fast ramp up (less lag), and low battery drain (spend more time in the lower frequencies). I like interactive/x, find that smartassv2 spends too much time in the mid frequencies (~500) even for light work. Using the app CPU Spy helps a lot to see what's going on. Also it tells you whether your phone is sleeping properly when screen is off, which is a big factor for battery drain.

CM 10 performance settings

I just got upgraded from CM 9 stable to CM 10 stable and I love it. Only problem is battery life. I feel about a 10-15% reduction with the new upgrade. I've had CM 10 for about 4 days now. I don't want to touch the performance settings without knowing what I'm doing. Is there a way to change my performance settings to extend the battery life? Also has anybody played with a different kernel with CM 10 stable? Thanks

abehbeh said:
I just got upgraded from CM 9 stable to CM 10 stable and I love it. Only problem is battery life. I feel about a 10-15% reduction with the new upgrade. I've had CM 10 for about 4 days now. I don't want to touch the performance settings without knowing what I'm doing. Is there a way to change my performance settings to extend the battery life? Also has anybody played with a different kernel with CM 10 stable? Thanks
Click to expand...
Click to collapse
Don't worry about changing the cpu and governor settings. There is an option to set at boot. Make sure that is disabled, so if you have any problems a reboot will go back to default settings. I use the conservative governor, and have my minimum cpu speed set to 192. I've read that that speed is not entirely stable for many people, but seems to be working fine for me. That has been pretty good for battery life for me. I believe the default governor is interactive now, and the minimum cpu speed is set to 384 by default.

Do you just "feel" a battery difference, or do you have any actual numbers to back up that assertion? Keep a close eye on Settings / Battery and use Better Battery Stats to record solid numbers and identify what's actually eating your battery.

Also turn off google now location settings if ur not using it. They are really hard on the battery.
Sent from my SAMSUNG-SGH-I727 using xda app-developers app

Disable Google now and battery should be back to normal here is some pics. Cm10 default kernel,stock clocks, no UV, on demand governed, and deadline as scheduler
Sent from my SAMSUNG-SGH-I727 using xda app-developers app

Thanks for the replies.
It seems to be my screen that is responsible for eating up my battery. Have had the phone disconnected from the charger for 4 hours now and all I've done is 20 min with screen time doing a little bit of texting and facebook and my charge is at 75. I have the automatic brightness setting off and put my setting at pretty low.
The cell stand-by battery usage is 8% during these 4 hours. Should I maybe try another radio or is this normal? It lost signal for about 10 min today.
Just turned off google now and selected the conservative governor. Let's see if this makes a difference.
I used to be able to go all day with my phone with CM 9 and I even have the nexus battery.
Thank you for all your help

That's most definitely not normal, at least in my experience. Are you using the vanilla CM10 or some variant?
Some things to try:
Install Better Battery Stats (find the free version on XDA via a search) to see if any apps are causing wakelocks. This is a must.
Use CPU Spy or something similar to see if your phone is entering Deep Sleep. This is a must.
Turn off Google Now unless you actually use it
Turn off all unnecessary radios (WiFi, Bluetooth, GPS) unless you're actually using them
Turn off all auto-refresh settings in every app you have -- all social apps and weather are the biggies
For me, turning off the default auto-refresh in Facebook, Google+ and Twitter are massive savings alone, then Settings / Battery & BBS will help you locate the remainder of the headaches quite easily.
You might want to consider swapping kernels too, or at the very least reconsider your CPU governor and scheduler settings.

I would stay away from conservative governor you won't get much performance out of that, stick with what comes stock and use on demand.... even the default interactive sucks my battery down
Sent from my SAMSUNG-SGH-I727 using xda app-developers app

abehbeh said:
Thanks for the replies.
It seems to be my screen that is responsible for eating up my battery. Have had the phone disconnected from the charger for 4 hours now and all I've done is 20 min with screen time doing a little bit of texting and facebook and my charge is at 75. I have the automatic brightness setting off and put my setting at pretty low.
The cell stand-by battery usage is 8% during these 4 hours. Should I maybe try another radio or is this normal? It lost signal for about 10 min today.
Just turned off google now and selected the conservative governor. Let's see if this makes a difference.
I used to be able to go all day with my phone with CM 9 and I even have the nexus battery.
Thank you for all your help
Click to expand...
Click to collapse
Don't use conservative, your phone is gonna be very slow and suck
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

I'm currently running the vanilla CM10
Turned off google now location access and set the govern to on demand early this morning and it is performing a little better most def.
I have noticed that my phone lost signal 4 times during the day for periods varying 5-10 min. I am currently on the I727UCLF6 radio. I'm thinking maybe I should try another one. Could that help with that battery maybe?
I have been thinking about switching kernels but I am a little doubtful because I don't want to mess up my phone too much since I so heavily depend on it. I loved the hotcakez kernel that came with AOCP, maybe i'll give it a shot this weekend.
Thanks for all the help people! Def the best forum by far on the web.

abehbeh said:
I'm currently running the vanilla CM10
Turned off google now location access and set the govern to on demand early this morning and it is performing a little better most def.
I have noticed that my phone lost signal 4 times during the day for periods varying 5-10 min. I am currently on the I727UCLF6 radio. I'm thinking maybe I should try another one. Could that help with that battery maybe?
I have been thinking about switching kernels but I am a little doubtful because I don't want to mess up my phone too much since I so heavily depend on it. I loved the hotcakez kernel that came with AOCP, maybe i'll give it a shot this weekend.
Thanks for all the help people! Def the best forum by far on the web.
Click to expand...
Click to collapse
Just do a nandroid backup of the entire phone first before installing a new kernel and your risk drops to zero. If you install it and it all goes to hell, just boot back into recovery and restore your backup.
As for radio ... if you drop signal that often and your phone is constantly searching for one, I suppose that could impact the battery, sure. Are you certain you're in an area with solid coverage, though?
Learn more about the different governors and schedulers: http://forum.xda-developers.com/showthread.php?t=1950084

Yea I might have to play around with some kernels this weekend. Luckily it is a long weekend so I'll have some time if I mess up
My phone will go from 4 bars and a good signal at -78 dBM in my apartment and then randomly I'll lose signal for abut 5-10 minutes. A restart usually does the trick or I can just wait until it regains the signal which can be frustrating. I never had any problems with my signal at home running CM 10 so that leads me to think that there might be some problems with the radio.
Just want to confirm that these are the 5 radios I can use for AT&T even though I'm running JB.
http://forum.xda-developers.com/showthread.php?t=1754473

I've been using a UCLI3 modem I found on XDA a couple of weeks ago, it has been incredibly stable and strong for me. But as many people far wiser than me have said elsewhere, everyone's mileage with radios varies and it really just takes some testing to see what works best for you.

so I should be able to run the 5 ICS radios I found eventho im running jb right?
thanks for your help

abehbeh said:
so I should be able to run the 5 ICS radios I found eventho im running jb right?
thanks for your help
Click to expand...
Click to collapse
Yeah if they are for the skyrocket.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

Android Experts Only - Battery Drain

Okay, I'm officially sick of battery drain. My first time with this issue was after flashing CM10, my GB build before that gave me the perfect amount of battery life. My phone would last throughout the day on GB. I got sick of the drain on CM10 after a week and flashed GB back to my device. My battery life has been normal the past few months on GB.
Since the official ICS builds were released I've been using ICS. I first flashed V28, battery drain was just like CM10. I flashed GB back and battery went back to normal. The next day official AT&T V30B was released, so I flashed it. Battery drain came back again.
Every single rom above GB has caused battery drain for my device. I've tried every suggested method I could find online. Flashing a different kernel, setting CPU Governor to hotplug, using nstools. I've done everything. I keep my phone in airplane mode, auto-sync is turned off, my brightness is at the lowest setting, gps and location settings are set to off, bluetooth is also off. I've tried charging the battery fully, pulling the battery out for a minute, charging fully again, pulling it again, charge some more, that didn't help at all.
My battery is dropping 10% in 15 minutes and all I have open is the web browser. This never happens on GB, no matter when I flash it. I don't understand what the issue is. I've also fully wiped my device internally and externally. I've spent a couple of hours trying to find an answer but nothing helps. If you can assist me, please take a minute and do so, this is frustrating. Thanks in advance.

Well generally yes. ICS+ drains a lot more battery than GB for a reason. Its running many more system apps and this can put a strain on battery life with the system working that hard "While Sleeping too". If you really cant take the drain.. Order and extended battery online. I suggest checking out the Accessory section. Good luck!
Sent from my R800i using xda app-developers app

Greenify + betterbatterystats
Two great apps that will help with battery life

Am i the only one getting significantly BETTER battery life on ICS?

mchartier said:
Am i the only one getting significantly BETTER battery life on ICS?
Click to expand...
Click to collapse
No. You are not. ICS consume much less battery due to the better RAM organization and memory killer. Just in many ROMs there is too much stupid programs and in many KERNELs are not optimized. Moreover people compare all data switched off of GB and the many process running by default in ICS that they can switch off.
The ROM/Kernel combination (by Acura) in my signature give me 48h battery life - the same like the GBs by Acura or Darkroom Team.
So... it is better not to compare STOCK GB with STOCK ICS - you never know the tweaks and running stuff by default. Better compare Developer GB with the SAME developer ICS ROM if you want to claim such a think.

AW: Android Experts Only - Battery Drain
mchartier said:
Am i the only one getting significantly BETTER battery life on ICS?
Click to expand...
Click to collapse
No, mine is better, too.
Sent from my LG-P920 using xda app-developers app

mchartier said:
Am i the only one getting significantly BETTER battery life on ICS?
Click to expand...
Click to collapse
Me too, at least comparing the stock GB with the stock ICS.
There's no use of comparing custom ROMs/kernels anyway.

botson71 said:
Me too, at least comparing the stock GB with the stock ICS.
There's no use of comparing custom ROMs/kernels anyway.
Click to expand...
Click to collapse
nope. other way around. you never know what kind of sh*t is on is in STOCK, and you know that custom (developers) ROM are clean form most of them and tweaked for performance and battery. Stock mean ... "tweaked" and filled with bloatware by LG - nothing more.

p-vlad said:
nope. other way around. you never know what kind of sh*t is on is in STOCK, and you know that custom (developers) ROM are clean form most of them and tweaked for performance and battery. Stock mean ... "tweaked" and filled with bloatware by LG - nothing more.
Click to expand...
Click to collapse
True about the custom roms but you missed my point about the stock roms.
When someone claims for example that "the new xxx rom for my phone is worse/better than the old yyy rom", you have to ask "under what conditions". And in order to make a reasonable and reliable comparison, you need to compare the old and new stock roms and run the battery benchmarks only on those.
This is exactly what the biggest tech sites and magazines do when comparing the batteries. They run the tests on STOCK conditions/roms with as few apps as possible, apart of the stock apps.
Battery comparison is a delicate business. For example, even if you have the same two phones with the same stock roms, if the one phone receives a weaker 2G/3G or WiFi signal, its battery will finish much faster than the other one.
And if you start adding apps, changing to custom roms, kernels, radios and bootloaders then you have far too many factors in order to make a reliable comparison.

Okay, I tried geenify and bbs on a full charge and experienced no changes. My battery is dying quickly as we speak. My battery went from 81% to 34% in 5 1/2 hours in idle. I don't see how I'm having this issue and everyone else isn't.

botson71 said:
True about the custom roms but you missed my point about the stock roms.
When someone claims for example that "the new xxx rom for my phone is worse/better than the old yyy rom", you have to ask "under what conditions". And in order to make a reasonable and reliable comparison, you need to compare the old and new stock roms and run the battery benchmarks only on those.
This is exactly what the biggest tech sites and magazines do when comparing the batteries. They run the tests on STOCK conditions/roms with as few apps as possible, apart of the stock apps.
Battery comparison is a delicate business. For example, even if you have the same two phones with the same stock roms, if the one phone receives a weaker 2G/3G or WiFi signal, its battery will finish much faster than the other one.
And if you start adding apps, changing to custom roms, kernels, radios and bootloaders then you have far too many factors in order to make a reliable comparison.
Click to expand...
Click to collapse
"biggest tech sites and magazines" do PAID "comparisons" from A to Z. Do not trust any of them. Better compare best of X with best of Y. Or worse of X with the worse of Y. Like a scientist and like computer overclocker I know what means "Average" values.... there is no such a think. As i said - stock is just made by somebody... that is all... and here the developers are better. Moreover you do not know the current person how install the "Stock" Rom. If he did reset, if he still is on ext3 or on ext4. Does the person did a hard reset or not. Does still keep old baseband by installing the simple BIN or the BIN with baseband or the KDZ (bin+bb). different basebands different signal power etc etc etc... thats why i said BG of X with the ICS of X developer - they use nearly the same tweaks in all Roms with additions.

I had battery drain problem on all roms since GB untill v28b.
I lose about 1-2% during the night with wifi always on..I mean really always ON.[Thats 2% during 8h of sleep, on darkroom v2 i had 35% loss]
During the day my battery can last around 12h-15h..
My other,extended battery 3500mAh makes things a lot easier for gaming. I recharge them during the night and woooo..
V28b is the best rom and you should try flashing kdz with Mobile support tool like this:
http://p92x.acidhazardrom.com/guides/lg_flash_tool.html
There have been problems while flashing bin and fls but you never know, it's different for any user.
The second thing you should do is to erase or freeze any system app that you don't use.
For example I erased adrenalin6,gtalk,lg apps,........... and left only the apps that I really need.
I'm on stock v28b with the stock kernel and I have no problems.
And buy a new battery, maybe that's the problem..They are cheeeeep.

me to i have a very good lif batterie after flashe 28b i sharge it 100% wifi 3or 4 h day blut 1h day ande calls lyck always
for 1 day in GB v21e at 19:00 may batteri is in 20 or 15% CHARGE
in v28b for 1 day at 19:00 may batteri is in 55 or 50% CHARGE
send from my LG p920 ics v28b

Android1993 said:
Okay, I tried geenify and bbs on a full charge and experienced no changes. My battery is dying quickly as we speak. My battery went from 81% to 34% in 5 1/2 hours in idle. I don't see how I'm having this issue and everyone else isn't.
Click to expand...
Click to collapse
That is too much loss IF what you say is correct that your phone is idle..
My O3D with wifi on and ICS during nighttime goes from 100% to 95% and btw my battery is the original that i bought with the phone back in the summer of 2011.
It doesnt run on stock ROM but it does run on stock kernel for now...
And btw guys forget about magazine tests and such BS because they are just promoters...
Never compare STOCK ROMS with CUSTOM ROMS because custom ROMS will always be better than STOCK, thats the way its meant to be.

xbsall said:
That is too much loss IF what you say is correct that your phone is idle..
My O3D with wifi on and ICS during nighttime goes from 100% to 95% and btw my battery is the original that i bought with the phone back in the summer of 2011.
It doesnt run on stock ROM but it does run on stock kernel for now...
And btw guys forget about magazine tests and such BS because they are just promoters...
Never compare STOCK ROMS with CUSTOM ROMS because custom ROMS will always be better than STOCK, thats the way its meant to be.
Click to expand...
Click to collapse
I reverted back to GB, factory reset, now I'm flashing V30B one last time, I'll do a factory reset upon starting it up. Let's see if whatever has been broken the last 3 times gets fixed.
UPDATE: I think I got down to the issue. The phone isn't correctly reading the battery. I did a shut down and reboot and it went from 93% to 86% , I then plugged it in, shut it down and reboot again and it read 100%.
I'm done. I'll probably stick with GB til I get a new device.

p-vlad said:
"biggest tech sites and magazines" do PAID "comparisons" from A to Z. Do not trust any of them. Better compare best of X with best of Y. Or worse of X with the worse of Y. Like a scientist and like computer overclocker I know what means "Average" values.... there is no such a think. As i said - stock is just made by somebody... that is all... and here the developers are better. Moreover you do not know the current person how install the "Stock" Rom. If he did reset, if he still is on ext3 or on ext4. Does the person did a hard reset or not. Does still keep old baseband by installing the simple BIN or the BIN with baseband or the KDZ (bin+bb). different basebands different signal power etc etc etc... thats why i said BG of X with the ICS of X developer - they use nearly the same tweaks in all Roms with additions.
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You missed my point again.
Of course the good tweaked custom roms/kernels etc are far better than any stock roms, and not only in battery life, there's absolutely no question about that.
But when someone claims "the ICS rom has better/worse battery than the GB rom" it's much easier and more reliable to compare the ICS/GB stock roms than the custom roms, because of the much fewer degrees of freedom.
In a nutshell:
-Comparing, e.g., GB 21E stock rom with the ICS 28B stock rom: easy.
-Comparing, e.g., GB 21E custom rom which has different tweaks/kernels etc with an ICS custom rom which has again different tweaks/kernels etc: not so easy.

I'm having the same battery drain problem with mine too. Its driving me crazy to have to charge my phone 2-3 times a day
Sent from my LG-P925 using xda app-developers app

botson71 said:
You missed my point again.
Of course the good tweaked custom roms/kernels etc are far better than any stock roms, and not only in battery life, there's absolutely no question about that.
But when someone claims "the ICS rom has better/worse battery than the GB rom" it's much easier and more reliable to compare the ICS/GB stock roms than the custom roms, because of the much fewer degrees of freedom.
In a nutshell:
-Comparing, e.g., GB 21E stock rom with the ICS 28B stock rom: easy.
-Comparing, e.g., GB 21E custom rom which has different tweaks/kernels etc with an ICS custom rom which has again different tweaks/kernels etc: not so easy.
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Click to collapse
i got your point but....
lets hypothetically say:
1. Stock ROM GB give 75% of the max possible (best score of LG developers for 2 years developing from v. 10A to 21E). Stock ROM ICS 50% of the max possible (best score of LG developers for first leaked ROM)
2. Custom ROM GB - 99-99-99% of the max possible (best for developers A1, A2, A3). Custom ROM ICS 96-98-99% of the max possible (best for developers A1, A2, A3)
so...witch you think is better to compare - 50 with 75 from the max possible ("max possible" is the key phrase for speed, battery etc.) for LG
or comparing 98 with 99 for each GB or ICS custom... i would compare the last one. if 98 for GB is 16h and 99 for ICS is 14h ... then OK. GB is better. but not by original LG roms.
that is my point.

And another O3D tale...without happy end ;(
1.) Stock GB under heavy use (more then 3 hours of SMS, games & WiFi over the day) = A battery life of 13-19 hours
2.) Stock ICS v30a under minimal use (some SMS, little gaming and WiFi) = A battery life of approx. 10 hours
3.) Stock ICS v30a + ROOT, nearly no use at all over the day, no WiFi, (just 3 SMS) = A battery life of 7 hours.
After 2 hours in my jeans pocket = 68% of battery left
After 7 hours in ma jeans pocket = 8% of battery left (just 3 SMS written)
Then I read "Battery Re-Calibration" is of no use...and did not try it.
Then I read TaskKillers are nearly useless and un-installed "Advanced Task Killer"...didnt help. Re-Installing it didnt help either.
What is goin on here ?

May I suggest to check the CPU VRM (voltage regulator module) setting? I found out why, undervolting the CPU solved my problem. Voltage = ampere due to either linear and/or switchmode voltage regulator design.
EDIT: To clarify why voltage = ampere equations is true; ever wonder why PC motherboard gets away with shoving 100 Amps of power into the CPU without melting the 12V plug? In nutshell, battery trades amperage consumption for voltage shunted by inductor in switchmode VRM - in other word, battery have to work harder on higher CPU voltage settings but takes it easier at idle voltage.
Sent from my LG-P920 using XDA