Develop Bugs

Serious battery drain :(

I got my Desire in april and ever since I've never managed to get the battery to last more than a day.
I've tried different ROMs (Defrost, OpenDesire with and without Sense, MoDaCo r4, DJDroid, Neophyte, Pays-rom 2.1) but it's always the same: almost no drain in sleep mode but as soon as I turn the screen on and start using it the battery goes down ~20% every hour. I don't believe that's normal since some people get 3-4 days out of their battery.
For example, today my phone has been on for 2½ hours and lost 43% battery with WiFi on, just surfing the net and using Tapatalk.
The screen brightness is fixed at 30%, auto-sync off, bluetooth off, network mode set to WCDMA only and I have good 3G reception where I live.
I have no clue what to do, maybe someone else does?

I have the same life spend for my battery. I think its quite normal for desire. Unless I'm abnormal too : x
Sent from my HTC Desire using Tapatalk

You can use setCPU to underclock the processor or to create rules to make it powersaver.
I (as many other people) have one for setting the max/min processor to 245MHz when the screen is off, so it doesnt waste so much battery. I havent tested a lot, since I did it yesterday but the battery is lasting longer.
Also there are different ROMs that have better battery life...

AzureusPT said:
You can use setCPU to underclock the processor or to create rules to make it powersaver.
I (as many other people) have one for setting the max/min processor to 245MHz when the screen is off, so it doesnt waste so much battery. I havent tested a lot, since I did it yesterday but the battery is lasting longer.
Also there are different ROMs that have better battery life...
Click to expand...
Click to collapse
I'm using neophyte 1.3 now since it was said to give you good battery time but I don't think SetCPU works with it...
Sent from my HTC Desire using Tapatalk

I use JuiceDefender. Just by installing the free app from the market, I've increased my battery by 1.5x what it was originally.
With Ultimate Juice installed, I saw an increase of up to 2.5x.
Sods law, I can't purchase anything via the market due to having a Google Apps email account :|

gRoberts said:
I use JuiceDefender. Just by installing the free app from the market, I've increased my battery by 1.5x what it was originally.
With Ultimate Juice installed, I saw an increase of up to 2.5x.
Sods law, I can't purchase anything via the market due to having a Google Apps email account :|
Click to expand...
Click to collapse
I've tried it but it's not helping since I'm not syncing anything automatically anyway and the battery isn't drained with screen off.
It's when I start using the phone my battery percentage goes bananas.
And btw I know how you feel, I live in Sweden and we don't have paid apps here. Thank god for MarketAccess.
Sent from my HTC Desire using Tapatalk

My Desire was acting like that during my first 2 days of usage. The battery was draining really fast even in standby mode. I installed advanced task killers and after that the battery improved. I do not know if it is because this app or there were some other configurations that I accidentally did...
But the battery life right now is way better than before (even lasts longer than my previous iphone 3gs). Hope this helps =D

I have pretty decent battery life and I use the stock unrooted unmodified rom. Some apps completely obliterate battery life. I used to keep eBuddy open, but I found that it kills my battery faster then anything else.
Sent from my HTC Desire

Just downloaded setcpu to take a look. Should I be looking to use the default settings or is there something I should be changing?
Sent from my HTC Desire using XDA App

markuz85 said:
I got my Desire in april and ever since I've never managed to get the battery to last more than a day.
I've tried different ROMs (Defrost, OpenDesire with and without Sense, MoDaCo r4, DJDroid, Neophyte, Pays-rom 2.1) but it's always the same: almost no drain in sleep mode but as soon as I turn the screen on and start using it the battery goes down ~20% every hour. I don't believe that's normal since some people get 3-4 days out of their battery.
For example, today my phone has been on for 2½ hours and lost 43% battery with WiFi on, just surfing the net and using Tapatalk.
The screen brightness is fixed at 30%, auto-sync off, bluetooth off, network mode set to WCDMA only and I have good 3G reception where I live.
Click to expand...
Click to collapse
Hmm, when you say "just surfing the net", you're actually using WiFI + AMOLED + CPU, which are 3 of the biggest battery drains on the device.
IME, you can get days out of the phone, but if you actually have the screen turned on all of the time (i.e. you're actually using the phone), then 20% per hour probably isn't that insane. After all, that's 5 hours of continuous use, which isn't too awful from a modern smart phone.
Honestly, I think the answer might be "Yes, it does that" and "you'll probably need to charge it during the day". I've taken to charging mine on the way to work and back again (about 45 mins each way) and I'm still at 90% at bedtime.
Oh, and forget JuiceDefender. Yes, it makes a difference...but only when the screen is turned off. As soon as you start using it (and that's what you're obviously doing here), it shifts out of the way. Once I realised this, I uninstalled it...never looked back.
Daern

Oh, couple of other notes. Bluetooth doesn't make that much difference unless you're actually using it. 3G uses quite a bit more power compared to 2G. Consider switching to 2G when you're on WiFi. (sadly, no automated way to do this )

i am not using any of these tools.
i have wifi always on 3g on
no live wallpaper and push mail (k-9) with 2 accounts
my battery lasts 1,5-2 days. with phone turned off during the night. 0am till 7am.
i am surfing a lot and writing a lot emails.

daern said:
Hmm, when you say "just surfing the net", you're actually using WiFI + AMOLED + CPU, which are 3 of the biggest battery drains on the device.
IME, you can get days out of the phone, but if you actually have the screen turned on all of the time (i.e. you're actually using the phone), then 20% per hour probably isn't that insane. After all, that's 5 hours of continuous use, which isn't too awful from a modern smart phone.
Honestly, I think the answer might be "Yes, it does that" and "you'll probably need to charge it during the day". I've taken to charging mine on the way to work and back again (about 45 mins each way) and I'm still at 90% at bedtime.
Oh, and forget JuiceDefender. Yes, it makes a difference...but only when the screen is turned off. As soon as you start using it (and that's what you're obviously doing here), it shifts out of the way. Once I realised this, I uninstalled it...never looked back.
Daern
Click to expand...
Click to collapse
Okay so I guess it's normal, I guess I'll just have to fire up the ol' charger a bit more often then
Btw I don't use JuiceDefender anymore either, didn't make any difference other than the widget claiming to have increased your battery time
Sent from my Desire using Tapatalk

Here comes a hint:
Turn off ALL unnecessary widgets like "Bluetooth", "GPS", "WiFi". Turn off also "Mobile"-internet widget, and turn it on only when u want to update some apps or check your mail.
I have noticet that "Mobile"-internet widget drains hell of a lot battery, but if u turn it off now and then u will have ure phone, like I had, for 6 days - with one charge!

Norsehawk said:
Here comes a hint:
Turn off ALL unnecessary widgets like "Bluetooth", "GPS", "WiFi". Turn off also "Mobile"-internet widget, and turn it on only when u want to update some apps or check your mail.
I have noticet that "Mobile"-internet widget drains hell of a lot battery, but if u turn it off now and then u will have ure phone, like I had, for 6 days - with one charge!
Click to expand...
Click to collapse
I always have GPS turned off and wifi off when not using it, never used bluetooth and I'm using Data On Demand which turns off mobile data when the screen is off.
Sent from my Desire using Tapatalk

[Q] Battery drain too fast

I have been using Htc Desire + Motorola Milestone + samsung galaxy s these few days. It seems that my Desire, although lowest usage used up battery faster than milestone and galaxy, even in sleep mode! ( As for background syncing, milestone and galaxy used instant while desire is set to sync every 4hrs)
Is there anyway to at least increase the battery life?

In the first tow weeks the battery will not preform optimal, it needs a couple of charges before it operates as it should. Also if it seems that the battery drains to fast even in sleep mode, install current widget, set it to refresh every 5 minutes and to write a log. Normally the phone should use 5 to 10 mA on average during normal 3g standby (everything that allows push is set to push) and not more than 1 mA in flight mode. If your consumption is substantially higher than this you have either some very bad sync settings or there is a app running/syncing in the background when it should not be doing that. To check this dial *#*#4636#*#* and go to the battery usage and check the partial wake time.
Also are you using a task killer or does your Desire have worse mobile connection that the other phones (different network)?
To answer your question, yes there is something you can do to increase the battery life. There are different apps that help safe battery life, you can underclock and/or undervolt the cpu, swiching form 3g to 2g when no heavy internet is required, using as much a possible dark colors (only for amoled i believe) or lowering the background light.
But all this won't matter much if there is a background process which prevents the phone from sleeping.

TheGhost1233 said:
In the first tow weeks the battery will not preform optimal, it needs a couple of charges before it operates as it should. Also if it seems that the battery drains to fast even in sleep mode, install current widget, set it to refresh every 5 minutes and to write a log. Normally the phone should use 5 to 10 mA on average during normal 3g standby (everything that allows push is set to push) and not more than 1 mA in flight mode. If your consumption is substantially higher than this you have either some very bad sync settings or there is a app running/syncing in the background when it should not be doing that. To check this dial *#*#4636#*#* and go to the battery usage and check the partial wake time.
Also are you using a task killer or does your Desire have worse mobile connection that the other phones (different network)?
To answer your question, yes there is something you can do to increase the battery life. There are different apps that help safe battery life, you can underclock and/or undervolt the cpu, swiching form 3g to 2g when no heavy internet is required, using as much a possible dark colors (only for amoled i believe) or lowering the background light.
But all this won't matter much if there is a background process which prevents the phone from sleeping.
Click to expand...
Click to collapse
i have been using desire since june, its just that i use all 3 together recently and discover its's much battery draining. I seen the battery usage, and i saw radio cell is the highest standing at 80% while motorola milestone is around around 3%

magickiller9 said:
i have been using desire since june, its just that i use all 3 together recently and discover its's much battery draining. I seen the battery usage, and i saw radio cell is the highest standing at 80% while motorola milestone is around around 3%
Click to expand...
Click to collapse
Ofc it also depends on the roms you have on them and the radios, it'hard to tell...what have you got on your desire?

Thats not nice, my total cell standby and phone idle times total about 80% of the battery usage and i get 2 days out of one charge and if i don't play with it a lot and only use it as a phone( ) i got 3 days for one charge.
Oh one more thing, I got an S-LCD unit with a snow wallpaper.

vnvman said:
Ofc it also depends on the roms you have on them and the radios, it'hard to tell...what have you got on your desire?
Click to expand...
Click to collapse
I using the office Rom given by HTC
Sent from my HTC Desire using XDA App

better battery life

I've been using CyanogenMOD 7 and love it (mostly). The one thing I don’t like about it is the short battery life. I'm kind of new to rooting phones so it took me a bit to get it rooted and get CM7 rolling. I was wondering if there are any mods out there like CM7 that have better battery life? Or if there's any thing I can add to CM7 to give it more batter life?
I've been using android since the first phone came out so I’m already knowledgeable in what to turn off to try and extend the battery life, but I have noticed a big decrees in batter since installing CM7.
Thanks for the help guys
Trench

You can under clock the processor when your phone is asleep. This creates better battery life.
Sent from my HTC Vision using XDA App

Have you tried wiping battery stats?

evilcuber said:
You can under clock the processor when your phone is asleep. This creates better battery life.
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.

pmcqueen said:
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.
Click to expand...
Click to collapse
but i also mean setting the max sleep to 368mhz. by default its set at 800mhz. sometimes with apps running in the background, the processor may go to 800mhz without you knowing

check out 'powersave' and set your cpu max to 806mhz. should last you a nice long time like that. responsiveness suffers, of course.
'ondemand' and 806mhz is the best comprimise for me. still fine with HDvideo recording, streaming audio, Nav, etc
if you really want to make it last... clock down to 400mhz, turn off all the sync, set brightness and timeout to minimum, all the radios off (airplane mode), and the volume down, on vibrate.
;-)

pmcqueen said:
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.
Click to expand...
Click to collapse
But some govenors don't drop the sleep to the lowest profile. In fact almost all keep it above the lowest clock. Other kernels allow it and you can also use third party to set it lower. When the tweaKr script becomes universal it will be even better =)
Sent from hells ghost chili mexdroid

ohgood said:
check out 'powersave' and set your cpu max to 806mhz. should last you a nice long time like that. responsiveness suffers, of course.
'ondemand' and 806mhz is the best comprimise for me. still fine with HDvideo recording, streaming audio, Nav, etc
if you really want to make it last... clock down to 400mhz, turn off all the sync, set brightness and timeout to minimum, all the radios off (airplane mode), and the volume down, on vibrate.
;-)
Click to expand...
Click to collapse
It suffers in powersave because it stays at the lowest setting only. No reason to set to 806. Lol and that bottom comment is hella funny =), but if he does that his phone will just be...a waste of pocket space.
Your best bet is to do some research on kernels. If you are using cm7 to cm 7.0.3 id recommened pyros kernel. If you are on 7.1 or a nightly over 121 I believe id go with eugene's streamline5. It did wonders for mine Also there is a battery saving tips. Google G2 battery saving tips. Should be first link that comes up.
Cyanogenmod roms are known to be battery hungry. Nom nom nom.
Sent from hells ghost chili mexdroid

cjward23 said:
Have you tried wiping battery stats?
Click to expand...
Click to collapse
I used the battery califration app if that's what you mean.
Thanks for all the help guys, i'll check out some Kernals.

popimp315 said:
Your best bet is to do some research on kernels. If you are using cm7 to cm 7.0.3 id recommened pyros kernel.
Click to expand...
Click to collapse
Do you have link for this? I'm running 7.0.3.. but I dont think im finding the correct Kernal.

Mugen 3600mah = better battery life...

Can you elaborate on what kind of battery life you are getting now? How many hours, and for what level of usage?
How long have you been on CM? It takes a couple charge cycles of the battery after flash any ROM, for the battery meter to be accurate. Clear battery stats (as mentioned) then charge to 100%, let drain to about 20%, repeat a couple times. Don't drain until the phone dies. Some people say to do this, and its not good advice. Over discharge of Li ion batteries can cause them to no longer take a charge. There are people on here, on the Vision and other phones, that let their battery drain to empty, then the phone would no longer boot, forcing them to replace the battery.

Mog said:
Mugen 3600mah = better battery life...
Click to expand...
Click to collapse
It has good battery life but the battery sticks out a lot and its very uncomfortable
Sent from my HTC Vision using XDA App

evilcuber said:
It has good battery life but the battery sticks out a lot and its very uncomfortable
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
Yup its all opinionated. I would never go back to stock.
Sent from my T-Mobile G2 using XDA App

trench619 said:
Do you have link for this? I'm running 7.0.3.. but I dont think im finding the correct Kernal.
Click to expand...
Click to collapse
Dev section
Sent from my HTC Vision using XDA Premium App

Worried about battery life

I am a heavy texter with medium to low wifi usage. Sometimes I play games on my cell (Everlands) & last night I did some chatting.Usually battery last about a day but sometimes it goes down like after 16hrs which is quite low for what I have heard about this phone. Any way to identify the problem is ?
Maybe that is because I did not really charged uninterrupted on the first day due to constant loadshedding here in my city (about 1.5 hr gap in charging). I've heard Better battery stats is a good way of locating draining problems but I couldn't really understand it well enough to use it to my advantage.
Also I have set my brightness to lowest most of the time so thats quite surprising. Also net usage is mostly web browsing, no google maps or auto sync feature enabled as far as I know. Any tips about locating the problem ? Could hard reset possibly solve this issue ? Anyway my phone is less than 1 month old (3 weeks old) so should I consider taking it to service centre & getting battery replaced. Please help.

Salman Babri said:
I am a heavy texter with medium to low wifi usage. Sometimes I play games on my cell (Everlands) & last night I did some chatting.Usually battery last about a day but sometimes it goes down like after 16hrs which is quite low for what I have heard about this phone. Any way to identify the problem is ?
Maybe that is because I did not really charged uninterrupted on the first day due to constant loadshedding here in my city (about 1.5 hr gap in charging). I've heard Better battery stats is a good way of locating draining problems but I couldn't really understand it well enough to use it to my advantage.
Also I have set my brightness to lowest most of the time so thats quite surprising. Also net usage is mostly web browsing, no google maps or auto sync feature enabled as far as I know. Any tips about locating the problem ? Could hard reset possibly solve this issue ? Anyway my phone is less than 1 month old (3 weeks old) so should I consider taking it to service centre & getting battery replaced. Please help.
Click to expand...
Click to collapse
The battery is calibrating within 3 weeks if the phone is new (5-10 charge cycles) so the problem might not be a real one.
Are you on stock rom, stock kernel?
IF not, do you have kernel with overclock capabilities (titanium kernel, kiss kernel)?

1ceb0x said:
The battery is calibrating within 3 weeks if the phone is new (5-10 charge cycles) so the problem might not be a real one.
Are you on stock rom, stock kernel?
IF not, do you have kernel with overclock capabilities (titanium kernel, kiss kernel)?
Click to expand...
Click to collapse
The calibration thing sounds interesting. Everything is on stock. The phone is unrooted though I once thought of rooting it & rebooted the phone in recovery. How much does the battery last for u ? Right now battery has gone from 100 to 86% in 12hrs with somewhat lighter usage. Is this normal ?

Salman Babri said:
The calibration thing sounds interesting. Everything is on stock. The phone is unrooted though I once thought of rooting it & rebooted the phone in recovery. How much does the battery last for u ? Right now battery has gone from 100 to 86% in 12hrs with somewhat lighter usage. Is this normal ?
Click to expand...
Click to collapse
I'm having 48% after 10 hours with screen on at 61% but it is like this because i plugged in to my computer last night to put something on the sdcard.
In general your informations are alright, that is a fairly good battery life. Remember that you have a smartphone with gpu and cpu, and it is normal to eat battery even if when you don't play with it because it makes stuff in the background.
The great battery life i got at 3 days with 50% screen on, wifi, calls, sms at 10-15% but not on stock, using CM9/Paranoid Android and tweaked kernel for better battery life .
In conclusion, don't worry about it. Your battery is fine!

If you really want better battery life try flashing a custom kernel like KISS or Titanium and undervolt your CPU.
I managed to undervolt mine alot (-300mV while idle) and battery life increased to almost 3-4days, which is really impressive compared to 1.5days it lasted before.

szerox said:
If you really want better battery life try flashing a custom kernel like KISS or Titanium and undervolt your CPU.
I managed to undervolt mine alot (-300mV while idle) and battery life increased to almost 3-4days, which is really impressive compared to 1.5days it lasted before.
Click to expand...
Click to collapse
How could you undervolt that low? It doesn't freeze your phone? At what frequency did you undervolt this low?
Sent from my One V using xda app-developers app

Its usually 1-1.5 days for me,its always on eater wifi or mobile network.
And i text a lot.Gmail,Whatsapp etc.
Screen is mostly at 70-80%.
As far as i am considered thats good,a lot of phones these days cant even get to 24h.

It works perfectly stable with the following settings:
Clock VDD (mV)
'24576 700'
'61440 700'
'122880 700'
'184320 700'
'192000 700'
'245760 700'
'368640 700'
'768000 850'
'806400 850'
'1024000 950'
Took me about 2 days to find them.
Sadly you cant go any lower then 700mV, seems to be a kernel restriction.

1ceb0x said:
on stock, using CM9/Paranoid Android and tweaked kernel for better battery life .
In conclusion, don't worry about it. Your battery is fine!
Click to expand...
Click to collapse
Where I could find that ROM ? Any suggestions for good stable ROMs for One V ? I am new to android OS.
JA_SAM said:
Its usually 1-1.5 days for me,its always on eater wifi or mobile network.
And i text a lot.Gmail,Whatsapp etc.
Screen is mostly at 70-80%.
As far as i am considered thats good,a lot of phones these days cant even get to 24h.
Click to expand...
Click to collapse
In my last charge the battery ran for about 1 day 6hrs when it said low bat, which is fine for me. However few times it oddly discharged like in 18hrs. Maybe I played too much games & used a lot of wifi at that time.

is there any apps that will actually improve your battery life at all? currently being rooted and have the pacman rom flashed to my gsm version.

JARR3DF15CH3R said:
is there any apps that will actually improve your battery life at all? currently being rooted and have the pacman rom flashed to my gsm version.
Click to expand...
Click to collapse
Use juice defender ultimate...it does all for u...
Hit thanks if I helped u...

JARR3DF15CH3R said:
is there any apps that will actually improve your battery life at all? currently being rooted and have the pacman rom flashed to my gsm version.
Click to expand...
Click to collapse
You can also try One Power Guard:
http://forum.xda-developers.com/showthread.php?t=1947559

With juice defender is it possible to have the icon in the status bar, but nothing in the notification drawer?
Sent from my One V using xda app-developers app

bratusm said:
You can also try One Power Guard:
http://forum.xda-developers.com/showthread.php?t=1947559
Click to expand...
Click to collapse
Sounds useful. What is your experience with One Power Guard?
Sent from my HTC One V using Tapatalk 2

Salman Babri said:
Sounds useful. What is your experience with One Power Guard?
Sent from my HTC One V using Tapatalk 2
Click to expand...
Click to collapse
For my phone and my use, excellent :good:
See my posts about app:
http://forum.xda-developers.com/showpost.php?p=35716446&postcount=343
http://forum.xda-developers.com/showpost.php?p=36944081&postcount=47
http://forum.xda-developers.com/showpost.php?p=37001884&postcount=51
You just have to try and see... Hopefully this app will work also for you... :fingers-crossed:

"Battery calibration" is snake oil. Period.
Also, I have 2 stock One V's in the family, rooted but no custom ROMs. Both devices on occasion (once a day at least) appear to be in sleep mode but taking the phone into a completely dark room reveals the backlight is still on (albeit very dim).
This is the only thing I see that's keeping my stock ROM from outstanding battery life. Even as is it get good battery life, but I also double check periodically to make sure the screen really is off.

BobbaLouie said:
"Battery calibration" is snake oil. Period.
Click to expand...
Click to collapse
Source?
Also stock ROM gets quite laggy after some time.
Sent from my HTC One V using Tapatalk 2

Salman Babri said:
Source?
Also stock ROM gets quite laggy after some time.
Sent from my HTC One V using Tapatalk 2
Click to expand...
Click to collapse
It's all over xda. However, here's a link:
https://plus.google.com/app/basic/stream/z13dgb0rksywh3muq222fzkqnwfgdbgrk04
It's from Dianne Hackborn, android developer for Google.
from here

Root your phone, put kernel titanium kiss, make it with 1.2GHz and smartassV2 cpu governor and than flash with full wipe myOneV 8.0 rom, put display brightness to automatic you will have stunning results.
P.S. make back ups to your data but do not restore it all from recovery

[Q] First timer - Pl suggest ROM upgrade to improve battery

Hello Champs.. I am first time user to this forum so pls excuse any idiot questions if it may seem.
I tried to go through threads to find answers but got completely confused, so though to put my question in simple words here.
I have Desire HD running task killer and Juice defender ultimate with extreme power saving option set and also optimized settings but still my phone don't last more than a day of normal usage. I just check emails, read news and call.. I do not play games and use any CPU intensive app. Phone is not rooted and running 2.3.5v of android
One of my friends told me after flashing ROM, battery power is improved by 40% in case of his tablet, so I am wondering if there is any suggestion for me to use for my Desire HD mobile. I have tried all options at application and settings level to improve the battery life.
As I am not too techincal in this field, if someone could write me few high level steps from start to end to get better battery life ROM and / or jellybean on Desire HD, I'll try to find out low level details of those steps in this forum and root (and flash) my mobile.
My sole requirement is to get as much battery as possible and if possible, some latest android version (4.1 or 4.2) to avail the new features.
Also, would there be an option to take the snapshot of current mobile setup in case if rooting / flashing goes wrong, I could revert back to the current version without loosing settings / data.
Thanks for your help.

two things, go to settings>about phone> battery
Or something like that. Take screenshots of your battery consumption, and the amount of time for each. Without that we can't know what's really causing your battery drain.
That said, a day of use will pretty much wind down your phone, the DHD has a very poor battery, decent sized screen, and most modern smartphones don't last terribly long anyways. However, you said you weren't using it too hard, so I'm not sure what it could be
As for juice defender, make sure that the intervals are set to no less than 15 minutes. 10 minutes pushing it. if you set it to 5 minutes, your phone will constantly be waking up from sleep (ultra battery saving mode), and constantly enabling and re-enabling radio. That'll cause more drain than it will save. At 15 you'll notice definitive increases, and at greater your battery will only get better.
Get rid of the task killer, or disable autotask killer and keep task killing to an absolute minimum. Never kill all your user apps at once. Kill only very large resource hogs (e.g. after playing a game, kill it). An autotask killer is very bad for your phone, and for your battery. Linux naturally tries to keep as many processes 'running' or cached in the background, using up a lot of your ram- it makes multitasking better, so in linux this is a good thing. With windows, it does the opposite, and if you run out of RAM you're screwed. A task killer will try to ruin that behavior, and in the end both performance and battery life will suck. It hurts battery life because after you kill that app, it'll just restart itself in the background- using more CPU therefore battery. Plus it also wakes your phone up from sleep when it needs it. I would only recommend a task killer for a phone with 512mb of RAM.
If it's an older battery, you could also have lost a lot of it's charge. I recommend installing battery monitor widget, and letting it run in the background. It'll estimate your mAH (battery capacity). If it's over 1,000, you're fine. If it's around 800, not bad, still doable. If it's at around 600, I would recommend going in for a replacement battery. I'm using an Anker 1500 (amazon), and I highly recommend it. Mugen 1600 is very good one, but it'll cost you a lot more money. I would not recommend an original HTC one.
finally, installing a custom ROM may or may not help battery life. With HTC Sense based ROMs, I've noticed a battery increase. In AOSP (unmodded, as google intended) gingerbread ROMs, you'll also notice a battery increase. With AOSP ICS, JB4.1.2 and 4.2.1 battery life is hit and miss, some ROMs will get you better battery, some will get you worse. You'll need to experiment around with it.
Also, yes you can backup everything after you install a custom recovery. I recommend looking up AAHK (advanced ace hack kit) on google and youtube, as well as rooting and S-OFF in general on youtube.

Thanks for your reply... Really appreciated. I'll look at the suggestions and see if it is unnecessary to root if 1 day battery is expected.
Do you think recommended high power battery actually improves usage time or people just compare their used up battery with new high capacity ones and think they hv got more juice in it. If high capacity ones really give another 2-3 hours of browsing as compared to OEM 1230 mah battery, I would rather buy it instead of flashing Rom.
Sent from my HTC Desire HD A9191 using xda app-developers app