Database Users

Battery life absolute trash?

So my N7 arrived two days ago, and I immediately unlocked, rooted, and flashed some things. Currently running Codename Android with Trinity Kernel.
My battery is absolute crap now though. Its been two days so I thought the battery more but have settled by now. All auto sync off, brightness at lowest setting, apps sync every 4 hours, still bad! Does calibrating still work? I read somewhere that it was debunked and it didn't work. I would appreciate any help. I mean, my Maxx is getting better battery life.
I uploaded some screenshots of the battery after only 1 and a half hours.
Sent from my Nexus 7 using Tapatalk 2

dafuq?
My Battery life is without doing nothing ~1-2weeks (in my with 58% xD)
Use Stock Kernel

renes2 said:
dafuq?
My Battery life is without doing nothing ~1-2weeks (in my with 58% xD)
Use Stock Kernel
Click to expand...
Click to collapse
Where can I find that to flash it?
Sent from my Nexus 7 using Tapatalk 2

Aliceics said:
Where can I find that to flash it?
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
Go to the motley kernel thread in Original Development. He provides a mirror link for the stock kernel
I loved Trinity and the TKT app but for some reason im getting much better battery life with motley kernel. I originally did some troubleshooting and fixed some apps that were causing wakelocks. My battery life got a little better but not by enough (could only get 3 or 4 hrs screen on) so i switched kernels.
If you feel like experimenting do this:
Nandroid
Wipe Cache + Dalvik
Wipe System
Factory Reset
Flash CM10 nightly (any rom of your choice)
Flash GApps
Flash motley kernel (i used the 484 GPU version)
Fix permissions
Reboot
I get awesome battery life now and performance is great.

Your title should be something like this: "After rooting and installing battery draining rom and kernel I get bad battery life on my N7"
Stock JB and kernel should yield decent batter life.
With the proper rom and kernel the Nexus 7 easily match or better the googles battery life claim.
FYI the latest Trinity kernel is a battery hog.

noobandriod said:
FYI the latest Trinity kernel is a battery hog.
Click to expand...
Click to collapse
if you use it at 1.7ghz it will be, but thats obvious. at 1150mhz, its as quick and wonderful on batteries.

simms22 said:
if you use it at 1.7ghz it will be, but thats obvious. at 1150mhz, its as quick and wonderful on batteries.
Click to expand...
Click to collapse
I wouldnt go as far as saying its a battery hog, but i ran the kernel at stock clocks and while performance was much better than stock i still had tons of drain that i now dont have with a different kernel.

Ran Trinity kernel at 1150mhz and had awful battery. Back on stock ROM and kernel and seems to have improved a lot.
Sent from my Nexus 7 using xda app-developers app

I feel like the battery is pretty decent...
Get off those custom Roms and kernels until you understand how the device is meant to perform.

You appear to have 87% after 1.5 hours, that equals about 10 hours, how is that bad? I get about 8 hours if I am intensely playing with screens, apps and games, 2 days if I'm not doing much. Loses 2% at night with wifi off. No root.

trinity kernel and the pure aosp rom, at 1150mhz. id say not bad at all..

Trinity Kernel is a good kernel. I went overboard by saying it was a battery hog. I did have it overclocked up to 1500hz on-demand and it ate up battery faster then I would like. But this is with the newest one, a few of the older ones worked out better for me though.

noobandriod said:
Trinity Kernel is a good kernel. I went overboard by saying it was a battery hog. I did have it overclocked up to 1500hz on-demand and it ate up battery faster then I would like. But this is with the newest one, a few of the older ones worked out better for me though.
Click to expand...
Click to collapse
yea, overclocking is mostly for fun, definitely not for battery life

640k said:
Get off those custom Roms and kernels until you understand how the device is meant to perform.
Click to expand...
Click to collapse
I have some problems with *wakelock*

[Q] Anyone can explain ? :)

So I have had my Nexus 4 for 7 exact days, was suffering from a terrible battery life of 1:30 hrs MAX screen-on. Until I flashed CM10.1+Franco's latest kernel and my phone has a 3:30 hrs of screen time on ! - I tried AOKP with Faux and some other rom combinations...Any one can explain why?
And clearly the battery life on WIFI surpasses the one on 3g.

It probably has a lot to do with the "msm_hsic_host" kernel wakelock that is present on the stock kernel. Flashing to either franco or faux kernel is supposed to be a great way to fix it and increase battery life

Because Franco Kernel is like magic?
Edit: oh hey! you're the same guy from yesterday I suggested Franco Kernel to and pm'd me for additional tips

Ensifolk said:
So I have had my Nexus 4 for 7 exact days, was suffering from a terrible battery life of 1:30 hrs MAX screen-on. Until I flashed CM10.1+Franco's latest kernel and my phone has a 3:30 hrs of screen time on ! - I tried AOKP with Faux and some other rom combinations...Any one can explain why?
And clearly the battery life on WIFI surpasses the one on 3g.
Click to expand...
Click to collapse
1:30 screen time Max? Damn.... Do you use your phone as a satellite? And WiFi IS ALWAYS better on the battery than 3g, that goes for any phones.
Sent from my Mako Nexus quattro using Tapatalk 2!

barondebxl said:
1:30 screen time Max? Damn.... Do you use your phone as a satellite? And WiFi IS ALWAYS better on the battery than 3g, that goes for any phones.
Sent from my Mako Nexus quattro using Tapatalk 2!
Click to expand...
Click to collapse
Wasn't even using my phone for anything but Browsing/Facebook/Whatsapp! LOL - And thanks guys for the reply, and yes Im the guy who pmd you man! Thanks a lot! Will give Faux a go right now And check how things will work....

Ensifolk said:
Wasn't even using my phone for anything but Browsing/Facebook/Whatsapp! LOL - And thanks guys for the reply, and yes Im the guy who pmd you man! Thanks a lot! Will give Faux a go right now And check how things will work....
Click to expand...
Click to collapse
I suggest using https://play.google.com/store/apps/...yLDEsImNvbS5iaWdleWVzMHgwLnRyaWNrc3Rlcm1vZCJd with those kernels. I use Franco's paid app but Trickster is a good free alternative!

zephiK said:
I suggest using https://play.google.com/store/apps/...yLDEsImNvbS5iaWdleWVzMHgwLnRyaWNrc3Rlcm1vZCJd with those kernels. I use Franco's paid app but Trickster is a good free alternative!
Click to expand...
Click to collapse
Thanks for the suggestion. Tinkering with phone settings is not in my priority list, but knowing what the kernel is doing with my phone is definitely useful if I decide to tinker later.
And free phone state knowledge is priceless (as in it has no list price :cyclops

KyraOfFire said:
Thanks for the suggestion. Tinkering with phone settings is not in my priority list, but knowing what the kernel is doing with my phone is definitely useful if I decide to tinker later.
And free phone state knowledge is priceless (as in it has no list price :cyclops
Click to expand...
Click to collapse
Not sure if it has the ability to disable logging and events (i think it does). You can disable those two features for better battery life (very insignificant but every bit helps, right?) and you can disable fsync if you choose to (more IO speed, less stability mainly if your phone was to randomly reboot).
Plus the free color changing is always nice to have.

3 to 4 hours with screen on is normal battery life for a stock Nexus 4.
It sounds like you were running something that was draining the battery.
When you updated the phone, the new ROM turned off the culprit.
The battery drain is not necessarily caused by an app, it could be one
of the Google services or bad reception. Even changing the phone's default
settings can result in much better battery life.

This might be a stupid question, but could switching from stock kernel/ROM fix my antenna radio reception bull**** issues?
Sent from my Nexus 4 using xda app-developers app

Am I The Only One ....

...Who seems to be getting worse battery life since I've rooted and installed CM10 and Franco Kernel than stock.
Before with stock I was only losing about 1% every two hours on standby (sometimes even better I've no idea how)
Now I'm losing about 3% an hour on standby and also about 30% an hour screen time with just basic browsing (Screen brightness set to auto).
Also Media server is hammering my battery. Like I lost 3% battery in 15 mins without the screen on just playing music (not streaming) is that normal, I've come from an iphone 4s which didn't lose that in an hour :S
have i flashed it badly is there something else maybe i should try or are these stats about right ????
thanks guys

That's just the way it is just custom roms. When flashing, put your head between your legs and pray for the best. You can spend hours trying to figure out what's gone wrong, but you might never get an answer.

You can try underclocking your N4. Currently my dual-core Snapdragon S3 T-Mo Galaxy S2 is underclocked to 810MHz from 1.5GHz and performance is still great. I'm guessing you can UC your N4 to at least 1.2-1GHz and performance will still be great because of the quad-core Snapdragon S4 Pro CPU. Also, what governor and i/o are you using?
Sent from my SGH-T989 using xda premium

Hi Gents
Thanks for the reply, yeah it does seem a bit of a hit and miss kinda situation, I'm not masively bothered, im hoping eventually someone will stumple across a fix for the way the screen murders the battery life but im not holding my breath. Still love the phone, really getting used to it now, have tried (and failed) many times to switch to android, must be honest, this is the closest I've come so far to waving bye bye to ios, android is really really fantastic as an os, it's also super pretty to look at these days, stock apps like contacts, calender and the phone app itself are beautiful.

Let the phone and battery have several cycles, it will improve, eventually

thanks mate !!

android88 said:
You can try underclocking your N4. Currently my dual-core Snapdragon S3 T-Mo Galaxy S2 is underclocked to 810MHz from 1.5GHz and performance is still great. I'm guessing you can UC your N4 to at least 1.2-1GHz and performance will still be great because of the quad-core Snapdragon S4 Pro CPU. Also, what governor and i/o are you using?
Sent from my SGH-T989 using xda premium
Click to expand...
Click to collapse
Under clocking your phone isn't a viable situation. It's a phone, what's the point in it if you're not going to use it to your fullest when my phone lasts through the whole day going from 384-1500?
Some battery tips for op:
- download better battery stats (Google it for a xda version) use this to debug wakelock and ensure your phone is deep sleeping under cpu states. You can also use cpu spy to check cpu stats. Better battery stats is a must need.
- disable Google latitude in maps. Disable the automatic reporting and any other checked marks
- disable Google now cards that you have no use for
- disable gps (some apps use gps and drains battery when it keeps using gps when it isn't necessary)
- ensure your governor is interactive and on latest version of Franco (r20 is very good)
Sent from my Nexus 4 using xda premium

Just stick with the stock kernel that comes with cm10.

peachpuff said:
Just stick with the stock kernel that comes with cm10.
Click to expand...
Click to collapse
Highly advise doing that. Other kernels are way more optimized whereas CM is focused on the ROM itself and not optimizing the stock kernel.
I believe CM10 uses stock Google kernel anyways (could be wrong).
Use Franco Kernel or anybody elses kernel that you choose to.

Mine definitely improved after rooting and flashing custom ROM. Battery life when I was still stock was horrible.

m3lover1 said:
Mine definitely improved after rooting and flashing custom ROM. Battery life when I was still stock was horrible.
Click to expand...
Click to collapse
Kernel is what makes battery life better, not a ROM.

zephiK said:
Kernel is what makes battery life better, not a ROM.
Click to expand...
Click to collapse
A rom can make the battery life better as well...

AshtonTS said:
A rom can make the battery life better as well...
Click to expand...
Click to collapse
A ROM has very minimal battery life improvements, it isn't as significant as a kernel. Hence the definition of "better"

[Q] The most battery friendly ROM???

Hello, I just wanted to ask which ROM has the longest battery life (in screen hours)...
The most battery frienly rom i have ever tried was liquidsmooth...
What do you think?

Guys please help out a new N4'er like myself. I'm stock right now and the number of Roms are kinda overwhelming. I'm only interested in battery life. I'm not in the mood to go flashaholic searching for that one ROM.
Sent from my Nexus 4 using XDA Premium HD app

The most important thing is the kernel and the apps you have installed.
Find the ROM with the features you like and flash a battery friendly kernel. I currently use Matrix kernel because the lower CPU idle makes the phone sip battery while the screen is off, leaving you more for actual use.
Good luck. Also, INB4L.

There is no "best Rom" for battery. It's all in how you use your phone, what apps you use, the signal strength in your area and of course the kernel you flash and how you set that kernel up.
100 different people could reply with the Rom they feel is best for battery and which kernel and you still may have different results than they do
Sent from my Nexus 4 using Tapatalk 2

From what I've learnt the kernel directly dictates battery life.
but I've personally opted for lean roms. If you're using a heavy rom and frequently putting load on the processor surely the battery will burn down fast. I've been using rasbeanjelly bouncing between franco/trinity and the battery life has been awesome for me.
Btw franco's r121 is godlike for me right now, in terms of both performance and battery life.

Im using liquidsmooth which comes with matrix kernel in the official release.
Im getting very good battery life probably because the cpu min is lowered to 288mhz instead of the normal 384.
Performance on the rom is great also with antutu scores over 20000
Ive tried francos, for some reason it didnt quite work for me but it is very popular because of the great balance between battery and performance. Youll get even more battery life out of faux and if you want blazing fast speeds try out trinity

Battery depends on the kernel, not on the rom.

Battery life depends on a number of factors, kernel being one of them. If you set your screen brightness at maximum high, you will see battery drain like water down the toilet. Screen brightness is the single major factor. Kernels don't really matter. It's the apps you install and run on your phone that can kill battery life. Apps like Facebook will suck down your battery like there's no tomorrow. Auto sync'ing and pushing and pulling data to and from your phone will make your battery life go down really fast. GPS and using google maps can contribute mightily to your battery woes as well.
To keep your phone from dying, just get an external battery pack and charge your phone as necessary. I have a 5400 mAh pack that can charge my n4 at least a couple of times. I never worry about running out of battery and I use my phone the way it's supposed to be used.

Underground_XI said:
Battery depends on the kernel, not on the rom.
Click to expand...
Click to collapse
Battery does depend on the rom...
For example a linaro compiled rom will require less work of the cpu to move the os due the optimization.
Also some rom have init.d scripts that can help battery life a lot and there is the possibility that some programs like systemUI can have a little bug that the user dont know about it but its draining battery
The battery life depends on a lot of factors of the rom

Underground_XI said:
Battery depends on the kernel, not on the rom.
Click to expand...
Click to collapse
You are completely wrong. As said before, battery life depends on a lot of things. The kernel is a big factor, but not everything. The way u use ur cpu, the scripts u apply or ur build.prop configurarion can be very decissive.
IMHO paranoidandroid 3.1 is the most battery saving ROM
Enviado desde mi Nexus 4 usando Tapatalk 2

s2 in jb 4.1.2 battery life

hi. I am o supernexus build 5 wth siyah kernel. I got round 7 hiurs if heavy usage on gs2. I've done facebook, viber, internet using stock browser and downloading around 200mb zip file. what can you say about this battery life. its my first time to use gs2 and I am using 2000mah. the battery life seems pretty bad in my opinion. I will attach screenshot of my hardware info, battery use and screen time. hoping for any opinions out there
Sent from my GT-I9100 using xda app-developers app

I think is good , for me with stock battery (1650mah) i get 3 hours and 30-40 minutes (screen on time), wifi on , screen brightness auto
Send from my SGS2 I9100 with HassanROM and latest DorimanX 8.xx kernel

I think the battery life should be better with a 2000mah battery..
Is the battery properly callibrated??

krazy1101 said:
I think is good , for me with stock battery (1650mah) i get 3 hours and 30-40 minutes (screen on time), wifi on , screen brightness auto
Send from my SGS2 I9100 with HassanROM and latest DorimanX 8.xx kernel
Click to expand...
Click to collapse
oh really that means I should be getting better because I am on 2000mah but it seems not. Im not sure what's the problem if its the battery or the kernel. I also used an ICS firmware from Samsung I9100TDULP4. I don't know if that affects the battery life
Sent from my GT-I9100 using xda app-developers app

peRFect! said:
I think the battery life should be better with a 2000mah battery..
Is the battery properly callibrated??
Click to expand...
Click to collapse
Well I dont know if it is properly calibrated. By the way I got this unit from my uncle so I am not really sure if the battery is still good. How do we know if its still good. I dont know how old is this battery. How do we calibrate the battery and does the room affect this battery life?
Sent from my GT-I9100 using xda app-developers app

by the way I just installed this rom A week ago. The battery takes 3-4 hours to be charged using my xperia charger
Sent from my GT-I9100 using xda app-developers app

I have suggestion for you , go to miuiandroid.com and download the latest build , install Siyah Kernel v6.0b5 with that and you will love the battery timing on that (Trust me, i am using it right now)

Mr.KiLLeR said:
I have suggestion for you , go to miuiandroid.com and download the latest build , install Siyah Kernel v6.0b5 with that and you will love the battery timing on that (Trust me, i am using it right now)
Click to expand...
Click to collapse
you mean downloading the miui rom? yeah definitely I'll give it a try after slimbean which I will try if I see no improvement on the bAttery. Has anyone had 2000mah and siyah kernel with supernexus rom build 5? What are your timings?
Sent from my GT-I9100 using xda app-developers app

infinitylook said:
you mean downloading the miui rom? yeah definitely I'll give it a try after slimbean which I will try if I see no improvement on the bAttery. Has anyone had 2000mah and siyah kernel with supernexus rom build 5? What are your timings?
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
I have tried Slim Bean too and after trying that i came to Miui Rom

anyone who have experience with 2000battery
Sent from my GT-I9100 using xda app-developers app

anyone who have experience with 2000battery
Sent from my GT-I9100 using xda app-developers app

right now I am using the original 1650 mah stock battery of s2. I've been doing a lot of file transfers as of this moment via e.s. file explorer and currently I am transferring almost 13gb of data via wifi from my laptop. its been awake for 4 hours now with screen time of 1 hour and 30min. e.s. file explorer is keeping the system awake for 3 hours. I did some facebook and viber chats. screen at 35% brightness.. do you think this is the expected life of the stock battery? I am fairly new to samsung and I found the battery life to be disappointing even with the stock jelly bean rom from samsung. I will post some pics of the battery stats and cpu stats from cpu spy. another thing though. is there a good app from the market where I can test my two batteries and compare them? thank you
Sent from my GT-I9100 using xda app-developers app

infinitylook said:
right now I am using the original 1650 mah stock battery of s2. I've been doing a lot of file transfers as of this moment via e.s. file explorer and currently I am transferring almost 13gb of data via wifi from my laptop. its been awake for 4 hours now with screen time of 1 hour and 30min. e.s. file explorer is keeping the system awake for 3 hours. I did some facebook and viber chats. screen at 35% brightness.. do you think this is the expected life of the stock battery? I am fairly new to samsung and I found the battery life to be disappointing even with the stock jelly bean rom from samsung. I will post some pics of the battery stats and cpu stats from cpu spy. another thing though. is there a good app from the market where I can test my two batteries and compare them? thank you
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
To callibrate battery..first completely drain the battery to about 5%, then charge the phone non stop without disturbing it till 100% and immediately remove the charger..again fully drain the battery and follow the above steps and u will get better battery life after a few cycles!
About roms..battery life does differ from rom to rom...i suggest u could check the custom kernels packed with zzmoove governor, ithat particular governor definitely improves the battery backup!
And in the above post es file explorer is eating ur battery..for that u should download greenify and hibernate apps continuously running in background!

great. I will follow your steps. one more thing. how can I know if the battery is still good or if its still holding the proper charge its suppose to have? thanks
Sent from my GT-I9100 using xda app-developers app

best I can get is about 3 days standby in jb stock.

I use the 2000mAh battery is primary battery.. no big surprise to expect here, capacity is just 21% more by construction...
With wifi on, JB burns in my case about 3% in IDLE.. stock kernel.. and about 5% in 3G mode, IDLE.. then battery drains more or less fast depending on screen on, phone calls etc. I use the phone extensively for work (email sync & replies, phone calls, sms and voip) and i have to topup the battery twice or trice a day!
Have tried various custom kernels with all sort of magic to reduce battery drain.. more or less effectively.. sometimes with less stability.
Right now trying out latest dorimanx 8.27.. seems thatn IDLE with WIFI on drains around 2% per hour.. better than stock.. still not quite awesome
I miss the GB battery life.. but JB is so beautiful in comparison, I cannot go back!

jmarcnms said:
I use the 2000mAh battery is primary battery.. no big surprise to expect here, capacity is just 21% more by construction...
With wifi on, JB burns in my case about 3% in IDLE.. stock kernel.. and about 5% in 3G mode, IDLE.. then battery drains more or less fast depending on screen on, phone calls etc. I use the phone extensively for work (email sync & replies, phone calls, sms and voip) and i have to topup the battery twice or trice a day!
Have tried various custom kernels with all sort of magic to reduce battery drain.. more or less effectively.. sometimes with less stability.
Right now trying out latest dorimanx 8.27.. seems thatn IDLE with WIFI on drains around 2% per hour.. better than stock.. still not quite awesome
I miss the GB battery life.. but JB is so beautiful in comparison, I cannot go back!
Click to expand...
Click to collapse
Does Jb stock for you has better life or does custom rom have more? I really like the custom roms but as per observation stock rom offers more battery time. Right now I just reverted to stock rom i9100xwlss. Touchwiz really sucks. Supernexus is really beautiful but offers less battery (but I will have to try yet their latest build). Also one of the reasons for going back to stock is the camera shot quality. Custom roms really have poor camera quality. I guess when it comes to lowlight shots the stock roms are best. So much for that. Does stock rom offer more battry for you or custom rom does?
Sent from my GT-I9100 using xda app-developers app

SGS2 Battery Life on 4.1.2
infinitylook said:
hi. I am o supernexus build 5 wth siyah kernel. I got round 7 hiurs if heavy usage on gs2. I've done facebook, viber, internet using stock browser and downloading around 200mb zip file. what can you say about this battery life. its my first time to use gs2 and I am using 2000mah. the battery life seems pretty bad in my opinion. I will attach screenshot of my hardware info, battery use and screen time. hoping for any opinions out there
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
Below is a reply in some other forum by Samsung offcials regarding a specific method to Hard-Reboot your phone after a Firmware update: This method particularly helped me improve the battery life on SGS2 after 4.1.2 update.
"1. I’m sorry you are having issues with your device after upgrading the firmware. I can understand your frustration about this.
Old systems settings can be left on the phone after an update occurs, which is why we usually recommend a full factory reset after updating. If this isn’t done your device may begin to give false readings from system resources, or experience technical problems, which may explain the issue you are having.
We would advise on doing the following, which is designed to reset the settings on your device. Please back up your device using Samsung KIES before you do this.
1) Remove the battery for at least 40 minutes, put the battery back in and allow it to fully discharge. Afterwards, perform a full battery charge with the device turned off. Do not interrupt the charging process.
2) After the battery is fully charged, we would like you to perform a full factory reset, which can be done via Settings > Backup > Reset.
This process will reset your device, remove old system files that are no longer needed and enable your device to operate normally again.
Please let us know if your device continues to experience problems after the reset so we can investigate further.
If you require any further assistance, please contact Samsung again and we will be more than happy to help.
Kind regards,
Stewart
Online Support Team
SAMSUNG Customer Support Centre

infinitylook said:
Does Jb stock for you has better life or does custom rom have more? I really like the custom roms but as per observation stock rom offers more battery time. Right now I just reverted to stock rom i9100xwlss. Touchwiz really sucks. Supernexus is really beautiful but offers less battery (but I will have to try yet their latest build). Also one of the reasons for going back to stock is the camera shot quality. Custom roms really have poor camera quality. I guess when it comes to lowlight shots the stock roms are best. So much for that. Does stock rom offer more battry for you or custom rom does?
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
Actually I only use stock JB.. and trying to get it last longer with some custom kernels.. recently trying snapdragon rom, which is stock JB as well but with some S4 apk made compatible with S2... tried some time back omega, vanila rootbox and some other android builds for s2.. but was facing few stability issues / bugs and also missed some features that i was getting from stock rom.. so i gave up with these... now just aiming at stability and if possible battery endurance.. but not at the cost of stability.