Hey guys


Just wondering if anyone else noticed this, but since the new froyo update, after i have updated my phone with the new froyo 2.2 firmware, the battery life has considerable dropped.

Anyone else noticed this, any key features etc.. that can be turned off to increase the battery life etc???

Hm, probably because its faster than eclair.

I'm not sure there is anything else to turn off. I've been keeping mostly everything to minimal. I guess you can - turn off the animations. Or, get a lagfix that uses a slower speed than the standard default of 256hz.

hardcore at XDA made a slower kernal that should save a tad more batteries. Here (http://forum.xda-developers.com/showthread.php?t=822756). (the 200hz one)

since the update have you done a factory reset? I certainly noticed a difference......

hmmm interesting so its not just me... well battery just about manages the day on not very much use to be honest. even the phone staying on standby seems to drain batter. tried putting brightness down and all options ie auto rotation gps wifi bluetooth off not much difference... Lagfix might be something or a different kernel maybe:S

any kernels someone can recommend?

iv not noticed ay difference.mine was charged 100% 5pm yesterday evening went to work used phone a few times,sent a couple of texts.had music playing for about 8 hours,i do a 12 hour shift .now at 6.45am its at 57%.

iv not noticed ay difference.mine was charged 100% 5pm yesterday evening went to work used phone a few times,sent a couple of texts.had music playing for about 8 hours,i do a 12 hour shift .now at 6.45am its at 57%.

so your battery has improved?

Are u using the stock kernel or a modified kernel?

Any lagfixes you are using?

My buddy at work was just complaining about the same thing (that the battery drains faster now), but if anything, I think my battery life has improved since updating.

I think my has improved but you need tio bear in mind there can be a number of apps working in the background, plus if you're listening to music, sending text and surf the net it will use battery life. Surely the reason you have the phone in the first place is for it apps & functionality otherwise get a box standard phone & the battery will last a week.

I too have noticed that the battery is not as good as it was on 2.1 I have done a factory reset since updating to 2.2

I am going to test it today without using any Wifi, 3G or apps just as a phone from a full battery.

It is currently at 95% since pulling the charger out at about 7:45am, I have not made a call, sent a text or anything on it apart from check battery status.

Me too find the battery life is not as good as Eclair, it lasts about 18 hours everyday. I am using modified kernal with lagfix.



Hardcore kernel speedmod-kernel-vH1-250hz (Ver I1.2)
Lagfix - NO-RFS advanced EXT4
Wifi and Data on all the time
Live Wallpaper
TweekDeck set to update every hour

the phone company's need to start investing some money into battery development

the phone company's need to start investing some money into battery development

Battery technology certainly isn't keeping up with the advances in mobile phones..

so your battery has improved?

Are u using the stock kernel or a modified kernel?

Any lagfixes you are using?

no lagfix,havnt found a need for it.as i said iv not seen any difference.out of curiosity il see how long it lasts till it needs charging.

Me too find the battery life is not as good as Eclair, it lasts about 18 hours everyday. I am using modified kernal with lagfix.



Hardcore kernel speedmod-kernel-vH1-250hz (Ver I1.2)
Lagfix - NO-RFS advanced EXT4
Wifi and Data on all the time
Live Wallpaper
TweekDeck set to update every hour


hmm im using the zenkins kernel since full charge and no use apart from the alarm going of for about 1 min the battery drain simply on stand by in 1.40 hours was 7 % dont think its great. Am maxing out 12 hours just about without a live wallpaper and all wifi, bluetooth etc turned off.

Maybe the kernel is too battery demanding, no real apps running all the time apart from ping chat

hmm im using the zenkins kernel since full charge and no use apart from the alarm going of for about 1 min the battery drain simply on stand by in 1.40 hours was 7 % dont think its great. Am maxing out 12 hours just about without a live wallpaper and all wifi, bluetooth etc turned off.

Maybe the kernel is too battery demanding, no real apps running all the time apart from ping chat

Overclocked kernel usually drain more battery than other kernel but I think the battery should last more than that as you have most things off. Have you tried reset batter state after flashing the kernel? See post# 376 in here (http://forum.xda-developers.com/showthread.php?p=9371181&highlight=battery+drain#post9371181)

Update:

OK, I am not using any live wallpapers, not overclocked and so far today have used WiFi for about 15-20mins to grab some emails from a full battery which was taken off the charger at 7:45am and at 12:45pm it was at 85% which is not bad for 5 hours but I have barely used it.

My phone is only 2 weeks old, new from T-Mobile.

Overclocked kernel usually drain more battery than other kernel but I think the battery should last more than that as you have most things off. Have you tried reset batter state after flashing the kernel? See post# 376 in here (http://forum.xda-developers.com/showthread.php?p=9371181&highlight=battery+drain#post9371181)

havent tried reset battery no but will try now... in terms of kernel i think the new speedmod-kernel-k9-256hz.zip looks good to me might try that, any idea weather it is ok to flash a new kernel over a existing kernel or to reflash the phone to stock kernel by flashing the orignal firmware and then flashing the new kernel?

Overclocked kernel usually drain more battery than other kernel but I think the battery should last more than that as you have most things off. Have you tried reset batter state after flashing the kernel? See post# 376 in here (http://forum.xda-developers.com/showthread.php?p=9371181&highlight=battery+drain#post9371181)

I've just tried that but didn't know what to expect, after the first command it said the application was asking for superuser permissions which I obviously said yes to. After the second command no message whatsoever......so I don't know if it has worked or not.

I've just tried that but didn't know what to expect, after the first command it said the application was asking for superuser permissions which I obviously said yes to. After the second command no message whatsoever......so I don't know if it has worked or not.

What it does is delete the batterystats.bin in /data/system folder. If your phone's battery stat is out of sync, you will see the percentage different after reboot phone.


in terms of kernel i think the new speedmod-kernel-k9-256hz.zip looks good to me might try that, any idea weather it is ok to flash a new kernel over a existing kernel or to reflash the phone to stock kernel by flashing the orignal firmware and then flashing the new kernel?

I havn't tried flash over different kernel but I did flash over with different version of speedmod-kernel, so I think that should be fine. Although it doesn't reset my data by flashing different version, I am not sure if it is same with different kernel. Do a backup before you flash just in case.

If your using Advanced task killer then ditch it as it's a mega battery drain. My phone is rooted and OCLF applied and running JPO. I use the stock task manager to achieve great battery life.
Here's my tips for what its worth. Switch off GPS, Bluetooth, Wifi etc and also turn off your 3G if your not using it.

1. Set your desk top screen to a black image
2. Go into your stock task manager and click on "RAM Manager"
3. Touch level 2 and clear memory
4. Touch your back button [not home button] until your back to your desk top. Your desktop will be blank and only showing the signal bar and time on the top of the screen.

Your phone will still receive texts and phone calls and after you use it to make/ receive calls, play with apps etc then go back into your task manager and repeat when your finished using the phone. This process takes seconds and saves you loads of power. So far my phone has been up for over 70 hours and I still have 50% battery power. When you need back into your phone just press your home key and either swipe or draw your unlock pattern and then your good to go! Give it a try and I'm sure you will instantly see the benefits :)

http://i166.photobucket.com/albums/u118/ado28/SC20101124-135320.png

http://i166.photobucket.com/albums/u118/ado28/SC20101124-135311-1.png

What it does is delete the batterystats.bin in /data/system folder. If your phone's battery stat is out of sync, you will see the percentage different after reboot phone.
After rebooting my phone the perczntage was 5% less, so it was saying my battery was fully charged when it wasn't :eek:

If your using Advanced task killer then ditch it as it's a mega battery drain. My phone is rooted and OCLF applied and running JPO. I use the stock task manager to achieve great battery life.
Here's my tips for what its worth. Switch off GPS, Bluetooth, Wifi etc and also turn off your 3G if your not using it.

1. Set your desk top screen to a black image
2. Go into your stock task manager and click on "RAM Manager"
3. Touch level 2 and clear memory
4. Touch your back button [not home button] until your back to your desk top. Your desktop will be blank and only showing the signal bar and time on the top of the screen.

Your phone will still receive texts and phone calls and after you use it to make/ receive calls, play with apps etc then go back into your task manager and repeat when your finished using the phone. This process takes seconds and saves you loads of power. So far my phone has been up for over 70 hours and I still have 50% battery power. When you need back into your phone just press your home key and either swipe or draw your unlock pattern and then your good to go! Give it a try and I'm sure you will instantly see the benefits :)

http://i166.photobucket.com/albums/u118/ado28/SC20101124-135320.png

http://i166.photobucket.com/albums/u118/ado28/SC20101124-135311-1.png

all I can say is after all this why have a smart phone

ok my phones been running 24 hours now and still 38% life left.
advanced task killer
wifi
gps all running.
my confusion with with this question is how many cant get to a home,car charger in 24 hour period?

Mine is worse than on eclair but its so much more of a phone that its worth charging every day (from every other day). My Iphone was just the same, use it and you will drain it, all smartphones are the same. Its no trouble to plug in a charger, just ignore it and when its flat charge it. Too many worries over saving battery spoil the pleasure of the phone I feel, mine lasts 24 hours and I have most things switched on to maximise full enjoyment of such a great phone.

I plug mine into the PC when I get home whether it needs a charge or not :) The USB cable is permanently there, under my monitor, waiting :)

i dont mind charging it up every night but one thing i do is once a week is use it untill the battery does run out then charge it up

i dont mind charging it up every night but one thing i do is once a week is use it untill the battery does run out then charge it up

Yeah. Last thing you want is to kill the battery life - then resorting to buying fake batteries or not as competent batteries. =s

all I can say is after all this why have a smart phone

I really don't get your question here. The smartphone has all the features ready at the touch of the screen. What is the point in having all the features active when the phone is in your pocket? The OP's question was in regards to poor battery life and I have offered a solution in to how [I] personally save battery power. When I need to use all the smart features then all I have to do is touch the screen. Should anyone wish to have all the bells and whistles going on their smartphones all day long then they will have to compromise this with the battery drain.

Hmm, this is weird.

I was on hardcore's k9 (300hz) lagfix. Then I reflashed it to the updated lagfix k9a (256 hz).

My battery went from 82 to 93, just from the update. Is it because the phone calculates how much battery i would use from the speed the processor is running or is there something weird going on?

Hmm, this is weird.

I was on hardcore's k9 (300hz) lagfix. Then I reflashed it to the updated lagfix k9a (256 hz).

My battery went from 82 to 93, just from the update. Is it because the phone calculates how much battery i would use from the speed the processor is running or is there something weird going on?

Not sure how it calculates but it is suggested always clear battery stat after flashing a new firmware or kernel.

went to bed last night battery life was 35%.about 12 hours of non use.its now at 28%,i never went into settings to turn everything off.this is from 5pm tuesday evening charge up.
question.does it help battery to be fully discharged occasionaly? because i havent done that with this phone so far.

Umm interesting.

My battery life has increased substantially since Froyo.

I use the standard energey saving features, no animations, turn off the haptics, vibrations etc, no live wallpaper (always slide over to a blank homescreen before locking screen), no background data stuff, GPS off etc. etc .have the OCLF lagfix, no special Kernals and..

.. I have sent about 200+ texts, made 20 phone calls - none more than 5 minutes, read Deadpool (comic) most nights for a few hours, did some web shopping for 3 lunches in a row with WiFi (about 40 mins) and still after 3 days is showing a battery of 45%.

I did do something recently though which might have helped.

I charged the phone to full from flat.
turned it off
charged the phone while it was off.
took the battery out
waited 60 seconds
placed battery back in and started phone up.

Since then it lasts for ages.

Dont get me wrong I havent sat with it and played games all day, or to music for 8 hours like the OP, but I havent just left my phone idle either.

I do suppose it all depends on what you do with the phone to the extent of how much battery life is used..


Before Froyo I would most certainly have charged my phone up at least twice now, or maybe its all a lie on my phone and any second its going to die on me leaving me in a state of social retardation until I charge it again - but no sign of this yet...


EDIT: I recently moved and I can see a mast a stone throws away and have full 3G constantly.. so this might be helping as its not constantly searching or roaming for the best of 2 weak signals which is all I had up until 2 weeks ago... That might be a battery killer?

the most thing that users the battery is the screen and surfing the net..when the back ground of a web site is white the screen users about 3 times more power that's why all the menues on the phone the back ground is black

Because I use my phone when I go fishing I bought a couple of batteries plus a charger off fleabay for around £12 including postage, they both last longer than the original...

hmmm so what conclusion do we come to?

hmmm so what conclusion do we come to?

it uses more power with froyo but you can turn bits off to save power but turn them back on when you want to use them

it uses more power with froyo but you can turn bits off to save power but turn them back on when you want to use them

Is that not what you shot me down for when I suggested that idea:confused: