Develop Bugs

Downclock CPU to save battery?

I`m not playing games or running CPU demanding apps, just phone calls/sms/bit of non flash web.
Is it possible to downclock CPU to increase usage(save battery)?
Or CPU doesn`t eat that much battery and downclocking would have very little effect on battery?

With a rooted device, you might want to try CPU Master Free. You will be able to decrease the clock speed.
Also, you could try to UnderVolt your CPU. Search for your phone model UV in te forums.

Min frequency is 350MHz so if your not doing anything it will be idling at 350mhz

rbs_uk said:
I`m not playing games or running CPU demanding apps, just phone calls/sms/bit of non flash web.
Is it possible to downclock CPU to increase usage(save battery)?
Or CPU doesn`t eat that much battery and downclocking would have very little effect on battery?
Click to expand...
Click to collapse
It does help you save precious battery life.
You can download the best app for overclock, SetCpu, from the XDA site, it's free for XDA members:
http://forum.xda-developers.com/showthread.php?t=505419

How much more battery life I could get by downclocking CPU? Any feedback from people who have tried such thing?

On my gn i find the screen to be the biggest user of thr battery power so underclocking prob would have little use, ohh and iirc the phone uses race to idle which procesess overything as fast as possible to get the cpu back it low power idle state.

rbs_uk said:
How much more battery life I could get by downclocking CPU? Any feedback from people who have tried such thing?
Click to expand...
Click to collapse
I normally charge my phone before go to sleep, I don't overcharging it during the night.
My SetCpu frequencies are Min 19/ 692 Max.
I am connected through 3G data ALL day and I am always online on Skype, I use my phone a lot, browsing, games, and phone call, and I can tell you, thanks to the undervolting, I got home at night with 50% juice remaining.
Without SetCpu, I would have 10/15% left at night...

yukinok25, that`s huge improvement, I`ll try it definitely.

rbs_uk said:
yukinok25, that`s huge improvement, I`ll try it definitely.
Click to expand...
Click to collapse
And...this is why we all love XDA...
Remember that battery life also depends on Radio version and kernel installed.

I remember there was a topic about "How to charge your phone first time" - cannot find it any more.

rbs_uk said:
I remember there was a topic about "How to charge your phone first time" - cannot find it any more.
Click to expand...
Click to collapse
If you mean after you just bought it, Its enough to let it fully discharge twice, without charging it, in between this two circles.
Anyway with nowdays Li-ion battery, you won't really need to this so anymore, since the lifespan of battery start to decrease from the moment that they left the production factory.

yukinok25 said:
If you mean after you just bought it, Its enough to let it fully discharge twice, without charging it, in between this two circles.
Click to expand...
Click to collapse
Yes.
Discharge twice without charging - hmm... once its dead its dead. I didn`t get it

rbs_uk said:
Yes.
Discharge twice without charging - hmm... once its dead its dead. I didn`t get it
Click to expand...
Click to collapse
Sorry for my english.
I meant during your usage time (during the day) don't charge your phone at all. let it discharge fully twice.

yukinok25 said:
Sorry for my english.
I meant during your usage time (during the day) don't charge your phone at all. let it discharge fully twice.
Click to expand...
Click to collapse
Ok, thanks.

Anytime mate!

Ive read good results on using juice defender app to prolong battery life:
http://android.modaco.com/topic/349071-galaxy-nexus-battery-drain-issues/

L60N said:
Ive read good results on using juice defender app to prolong battery life:
http://android.modaco.com/topic/349071-galaxy-nexus-battery-drain-issues/
Click to expand...
Click to collapse
I would not recommend juicedefender. Doesn't do anything at all. The only thing I notice is that nu wi-fi turned itself off when it shouldn't.
You could try AutomateIt. You can set up your own actions.
Ex: Within 100 meters of school > Sound off

How hot does your Battery get?

Hi,
You might laugh at this, but I have never owned a smart phone before. I got my Galaxy Nexus last Thursday and I took it for two trips this weekend, mounted on the dashboard. The trips were about a couple of hours each, and the weather was sunny with a temperature from 90 F to 97 F.
I use AndroSensor to measure the temperature of my battery. I found that my battery temperature was around 122 F most of the time, and once went up to 134 F. Is this OK or is there something wrong with my phone. Also the voltage of the phone dropped to 3.7 V as compared to 4.18 V when fully charged and cold.
I am just curious if there is something wrong with my phone. I would like to know what temperatures you guys see with the Galaxy Nexus.
Thank you,
O. O.

Depends my battery stays at 32 c when I work in a 55 f prep area. When I'm in a 82 f room it hits 60c with light usage. This is with trinity kernel. It manly depends on the temp of where you are
Sent from my Galaxy Nexus using xda premium

In a cool environment (low 70s F) my battery never reaches 120° F. At the moment, it's at 93°F, and I've been using it lightly for a while. Under very heavy usage I've see it reach 118, but more typically about 114. With moderate usage, I see 104 pretty often. After sitting overnight it's usually about mid-80s.
Being on a hot dashboard in direct sunlight on a hot day probably affected your battery temp quite a bit.
Cool Tool is pretty good for monitoring things like battery temp.

strumcat said:
In a cool environment (low 70s F) my battery never reaches 120° F. At the moment, it's at 93°F, and I've been using it lightly for a while. Under very heavy usage I've see it reach 118, but more typically about 114. With moderate usage, I see 104 pretty often. After sitting overnight it's usually about mid-80s.
Being on a hot dashboard in direct sunlight on a hot day probably affected your battery temp quite a bit.
Cool Tool is pretty good for monitoring things like battery temp.
Click to expand...
Click to collapse
Thanks strumcat. There was direct sunlight on the phone since it was mounted on the dashboard, but still 134 F is ridiculous. Does anyone have any idea what he upper limit of the temperature of the battery is? This is a new phone so I would like to know if there is a problem right now before my 15 day trial period expires.
Thank you,
O. O.

I reach 144°F when I play games and do heavy Facebook+browser Tasks.
Yesterday reached the temp of near shut down (12°F close). Be careful where u use your phone. Like the summer at Disney.
°___° always got hot to point to where I can't use it.
Q: battery dies faster when it's hotter then normal right???
--------------------------------------------------
If I have helped you.... hit that sexy thanks button. ^_^

I can't get past 110F if I try.
Best heat management I've seen on a phone personally.
Sent from my Galaxy Nexus using Tapatalk 2

If it was on direct sunlight, 130-ish is not that bad. But make sure that you don't do that next time. That can really be a huge problem. Also you know how hot the CPU was? I find you have to look out for CPU temperature more than battery, because CPU gets really, REALLY hot for me.
My max. battery temperature is around 120F, while charging and browsing/socializing. But my CPU temperature goes beyond 60C easily with light use...

Dragn4rce said:
I reach 144°F when I play games and do heavy Facebook+browser Tasks.
Yesterday reached the temp of near shut down (12°F close). Be careful where u use your phone. Like the summer at Disney.
°___° always got hot to point to where I can't use it.
Q: battery dies faster when it's hotter then normal right???
--------------------------------------------------
If I have helped you.... hit that sexy thanks button. ^_^
Click to expand...
Click to collapse
Thanks Dragn4rce Do you have any clue what the Shutdown Temperature is? What does 12°F mean??
O. O.

kyokeun1234 said:
If it was on direct sunlight, 130-ish is not that bad. But make sure that you don't do that next time. That can really be a huge problem. Also you know how hot the CPU was? I find you have to look out for CPU temperature more than battery, because CPU gets really, REALLY hot for me.
My max. battery temperature is around 120F, while charging and browsing/socializing. But my CPU temperature goes beyond 60C easily with light use...
Click to expand...
Click to collapse
Thanks kyokeun1234 How do you measure the CPU temperature? I am new to all of this.
O. O.

I was 12°F(169°F) away from shut down.
And in °F, it is 180°F before the phone shuts it self down.
--------------------------------------------------
If I have helped you.... hit that sexy thanks button. ^_^

110 F is as high as mine has gone. Personal hand warmer!

o.o. said:
Thanks kyokeun1234 How do you measure the CPU temperature? I am new to all of this.
O. O.
Click to expand...
Click to collapse
I'm really sorry, but I am yet to find that out. The only reason why I know this is because of SetCPU feature, which is underclocking when CPU temperature reaches certain heat.
I've just searched cpu temperature on Play Store and here's is decent looking one... I dunno if it will work or not though...: https://play.google.com/store/apps/...51bGwsMSwxLDEsImNvbS5zYW5lbHMudGVtcGNwdXYyIl0.

kyokeun1234 said:
I'm really sorry, but I am yet to find that out.
Click to expand...
Click to collapse
Open Terminal Emulator and run cat /sys/devices/platform/omap/omap_temp_sensor.0/temperature. Divide by 1000 and you have temperature in Celsius.

Thank you guys for the information. I think this is all I need. As Dragn4rce mentioned the cut-off is 180F so its nice to know that I was much below that threshold.
O. O.

Safe battery temps

So im using tbaldens cm9 and set the CPU to performance, which sets CPU at 1400 constant. So I was playing temple run for about 10 minutes and my battery temp got up to 50 degrees. I have a program called Droid system suite and it said my battery was overheating at that temp. My question is, what is a safe temp for the battery? And how long should that temp be maintained? Thanks advance.
Sent from my CM9 Powered HOX

shinigamikris said:
So im using tbaldens cm9 and set the CPU to performance, which sets CPU at 1400 constant. So I was playing temple run for about 10 minutes and my battery temp got up to 50 degrees. I have a program called Droid system suite and it said my battery was overheating at that temp. My question is, what is a safe temp for the battery? And how long should that temp be maintained? Thanks advance.
Sent from my CM9 Powered HOX
Click to expand...
Click to collapse
to be safe don't let your battery temperature exceed above 50 c
below that temp its safe

vivek_bhoj said:
to be safe don't let your battery temperature exceed above 50 c
below that temp its safe
Click to expand...
Click to collapse
So would it be OK to sit at 50 c for periods of say 30 minutes? It gets bloody hot to touch
Sent from my CM9 Powered HOX

As lithium battery exceeds their operating temperature regulary, it will impact on it's life. While working on overheating state, it may not able to provide stable/enough currents to the phone. Wrost case scenario == blow (ignore, this need really hot).

shinigamikris said:
So would it be OK to sit at 50 c for periods of say 30 minutes? It gets bloody hot to touch
Sent from my CM9 Powered HOX
Click to expand...
Click to collapse
well i would say if temp reaches 50 c then leave ur phone for some time as it will affect battery life and also don't use ur phone while charging until the battery is charged more than 50% as many times while playing games at charging less than 50% our phone consumes more power than the power it is receiving

HebeGuess said:
As lithium battery exceeds their operating temperature regulary, it will impact on it's life. While working on overheating state, it may not able to provide stable/enough currents to the phone. Wrost case scenario == blow (ignore, this need really hot).
Click to expand...
Click to collapse
What temp would be "really hot"?
vivek_bhoj said:
well i would say if temp reaches 50 c then leave ur phone for some time as it will affect battery life and also don't use ur phone while charging until the battery is charged more than 50% as many times while playing games at charging less than 50% our phone consumes more power than the power it is receiving
Click to expand...
Click to collapse
It gets to 50 c after only 10 minutes of game time. So you think 50 c for battery is too high? Should I stop gaming if it gets to 50? Don't really care if it uses heaps of battery, just don't want to damage it. Lol.
Sent from my CM9 Powered HOX

shinigamikris said:
What temp would be "really hot"?
It gets to 50 c after only 10 minutes of game time. So you think 50 c for battery is too high? Should I stop gaming if it gets to 50? Don't really care if it uses heaps of battery, just don't want to damage it. Lol.
Sent from my CM9 Powered HOX
Click to expand...
Click to collapse
which game are you playing? i have played many games and none take me to 50 c in 10 minutes
may be u can try faux kernel to reduce battery temperature and which rom are u ysing?
---------- Post added at 07:48 AM ---------- Previous post was at 07:36 AM ----------
vivek_bhoj said:
which game are you playing? i have played many games and none take me to 50 c in 10 minutes
may be u can try faux kernel to reduce battery temperature and which rom are u ysing?
Click to expand...
Click to collapse
As most of the smartphones now use LiPo battery, so here is a safety guide:
http://www.icharger.co.nz/articles/ArticleId/3/Lipo-Lithium-Battery-Safety-Guide.aspx

Wowza!!! That's hot!

All good, took it off performance mode and set the minimum speed to 475, seems to be not getting as hot now, where as I had it set to 1400 all the time and it would get really hot...
Sent from my CM9 (Beta 5 / Tbalden) Powered HOX

htc released a statement near to when the hox was released. it said that 55 celcius was normal and safe.

Yea mine is running under that most of the time on CM10 ROM. Playing 3D intensive games like Dead Trigger. Does get hot after quite sometime but not 10min. Good thinking with the CPU Speed adjustment, i used an overclocked kernel for a short bit @1.7GHz but that got pretty hot pretty fast so I have left that for now. Don't really need it on a quad core. Yet.

[Q] Galaxy Nexus getting way too hot

I just got out of the shower and grabbed my phone, to have it literally burn me. The hottest I've ever seen it get (while still on) was 180°F and this was way hotter, I'd guess around 250°F. Why is this? It was charging, not over clocked at the time, limited to 2 background processes, and the app "reddit is fun" was the only thing open.
Phones in the freezer at the moment, so I can only hope it and the battery didn't suffer any internal damage. Wheres the thermal cut off? (That was not disabled in Franco.kernel settings)

Gatortribe said:
I just got out of the shower and grabbed my phone, to have it literally burn me. The hottest I've ever seen it get (while still on) was 180°F and this was way hotter, I'd guess around 250°F. Why is this? It was charging, not over clocked at the time, limited to 2 background processes, and the app "reddit is fun" was the only thing open.
Phones in the freezer at the moment, so I can only hope it and the battery didn't suffer any internal damage. Wheres the thermal cut off? (That was not disabled in Franco.kernel settings)
Click to expand...
Click to collapse
First you are going to need to tell us what you have modified to the phone. Also remove it from the freezer as this thermal shock can cause more damage. simply remove the battery from it. is this a stock battery? did you turn on fast charge?4was this under your pillow while it was charging? etc etc. we need more information to properly help you. and was this battery temp that you measured or cpu core temp?

Darunion said:
First you are going to need to tell us what you have modified to the phone. Also remove it from the freezer as this thermal shock can cause more damage. simply remove the battery from it. is this a stock battery? did you turn on fast charge?4was this under your pillow while it was charging? etc etc. we need more information to properly help you. and was this battery temp that you measured or cpu core temp?
Click to expand...
Click to collapse
Running CM10, Franco kernel. Battery is stock, no fast charge. It was slightly under the pillow (but it always is, this is the first time I had this problem since I got it in February). I didn't measure the temp (phone wouldn't even go on so I just pulled the battery before it got any hotter), its just an estimate because I know it was above 180°F.

Gatortribe said:
Running CM10, Franco kernel. Battery is stock, no fast charge. It was slightly under the pillow (but it always is, this is the first time I had this problem since I got it in February). I didn't measure the temp (phone wouldn't even go on so I just pulled the battery before it got any hotter), its just an estimate because I know it was above 180°F.
Click to expand...
Click to collapse
Cells are storage tested at 65C and charge temps can reach higher than that. I wouldnt have a panic attack over this instance but the next time you charge it, monitor it with a battery app that displays battery temperature. Your battery could be going bad.

Darunion said:
Cells are storage tested at 65C and charge temps can reach higher than that. I wouldnt have a panic attack over this instance but the next time you charge it, monitor it with a battery app that displays battery temperature. Your battery could be going bad.
Click to expand...
Click to collapse
Download System Panel from the Play Store and monitor your CPU activity and active apps. I've had rouge apps churn my processors @100% before. It's a sure fire way to generate heat!

Damn, i had so high expectations seeing a picture of a HOT naked nexus (I know...hard to get much hotter then it is right now) after reading the title, but alas no such luck
Swype'ed on my CM10 Galaxy Nexus

G3 bricked?

Argg!
I was playing a game on my G3 (UK 16GB) and it got SUPER hot!
It turned off and now will not turn back on. It's stuck on the LG initial splash screen.
I've done all the usual (remove battery, power + volume down, recharge battery etc) but I'm stuck.
Any suggestions before I return it today?
I'm sad ?
Sent from my Nexus 5 using XDA Free mobile app

ShiroEd said:
Argg!
I was playing a game on my G3 (UK 16GB) and it got SUPER hot!
It turned off and now will not turn back on. It's stuck on the LG initial splash screen.
I've done all the usual (remove battery, power + volume down, recharge battery etc) but I'm stuck.
Any suggestions before I return it today?
I'm sad ?
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
I would say return it man.

Has the phone called back down yet?
Don't try to turn it on until its cooled down.
Take the battery out and leave the back door off for half hour then try again.
Just so we know, did you turn Thermal Throttling off in the hidden menu? If so, this is a prime example of why I have been telling people not to do this.

Lennyuk said:
Has the phone called back down yet?
Don't try to turn it on until its cooled down.
Take the battery out and leave the back door off for half hour then try again.
Just so we know, did you turn Thermal Throttling off in the hidden menu? If so, this is a prime example of why I have been telling people not to do this.
Click to expand...
Click to collapse
This thought did cross my mind as well.

Lennyuk said:
Has the phone called back down yet?
Don't try to turn it on until its cooled down.
Take the battery out and leave the back door off for half hour then try again.
Just so we know, did you turn Thermal Throttling off in the hidden menu? If so, this is a prime example of why I have been telling people not to do this.
Click to expand...
Click to collapse
Hey Lenny,
I didn't turn Thermal Throttling off. And I would also advise people to not do that.
I've just returned from CPW with a brand new handset! FYI the 28 day replacement policy starts from the day you receive the phone so I was still covered. Just!
I did all the things you suggest. It was stone cold and it still wouldn't get past the LG boot screen. Also the little sparkly animation on the LG letters wasn't playing which suggests it borks out very early on in the boot sequence.
I really hope we don't start to see this more.
Fingers crossed!

ShiroEd said:
Hey Lenny,
I didn't turn Thermal Throttling off. And I would also advise people to not do that.
I've just returned from CPW with a brand new handset! FYI the 28 day replacement policy starts from the day you receive the phone so I was still covered. Just!
I did all the things you suggest. It was stone cold and it still wouldn't get past the LG boot screen. Also the little sparkly animation on the LG letters wasn't playing which suggests it borks out very early on in the boot sequence.
I really hope we don't start to see this more.
Fingers crossed!
Click to expand...
Click to collapse
Good luck with the new phone then.

alright now im starting to worry frying my device. Last time i ran antutu battery test it runs hot. The highest temp that i got is 41.8c on battery temp. It normally runs at 34 to 36 if im playing with it but wont go over 40.. Do you think my device is also running too hot?

SpEaKeRb0xXx said:
alright now im starting to worry frying my device. Last time i ran antutu battery test it runs hot. The highest temp that i got is 41.8c on battery temp. It normally runs at 34 to 36 if im playing with it but wont go over 40.. Do you think my device is also running too hot?
Click to expand...
Click to collapse
anything below 50 degrees is not really anything to worry about.

SpEaKeRb0xXx said:
alright now im starting to worry frying my device. Last time i ran antutu battery test it runs hot. The highest temp that i got is 41.8c on battery temp. It normally runs at 34 to 36 if im playing with it but wont go over 40.. Do you think my device is also running too hot?
Click to expand...
Click to collapse
Thats cool,my G3s ran Antutu at 60+deg C and idled at 45-58. Your temps make me wonder if i had faulty units (i had 2 as the first one had a fault).
Edit, just read you said battery temp? You need to measure CPU temp not battery.

Batfink33 said:
Thats cool,my G3s ran Antutu at 60+deg C and idled at 45-58. Your temps make me wonder if i had faulty units (i had 2 as the first one had a fault).
Edit, just read you said battery temp? You need to measure CPU temp not battery.
Click to expand...
Click to collapse
That is what i wanted to know... Is there any apps out there that can measure cpu temp accurately? Does our cpu have built in sensor? Batt is heating upto 40c,,, what more in cpu... I wanted to run a full test again after fully charge.

SpEaKeRb0xXx said:
That is what i wanted to know... Is there any apps out there that can measure cpu temp accurately? Does our cpu have built in sensor? Batt is heating upto 40c,,, what more in cpu... I wanted to run a full test again after fully charge.
Click to expand...
Click to collapse
Try the app made by Mooncakes on the play store. Just search for CPU temperature its free and graphs temps v cpu usage and speed.

Batfink33 said:
Try the app made by Mooncakes on the play store. Just search for CPU temperature its free and graphs temps v cpu usage and speed.
Click to expand...
Click to collapse
Thanks man. Ill try that one