Database Info

Why is Android's battery always so darn inaccurate

My icon in the notif bar looks like 80% and it is 40% lol. I don't get it.

hah2110 said:
My icon in the notif bar looks like 80% and it is 40% lol. I don't get it.
Click to expand...
Click to collapse
Strange, I haven't noticed this.
1) What phone are you using
2) What ROM are you running
3) Have you wiped your phone along with the cache?

akapoor said:
Strange, I haven't noticed this.
1) What phone are you using
2) What ROM are you running
3) Have you wiped your phone along with the cache?
Click to expand...
Click to collapse
Almost every Android phone. It is a known problem.

I don't seem to have an issue with it.
When it reaches 75%, my bar is 3/4s. When it's 50, its half-way...etc...etc...

hah2110 said:
Almost every Android phone. It is a known problem.
Click to expand...
Click to collapse
Awsome job answering 3 questions with a random statement.
I know the phone stores the info about the battery in a file. This file includes the max charge the battery can charge too. There is a method somewhere on these forums that show how to drain your battery, wipe the file, then do a full charge so the phone can relearn the battery and the correct settings get saved.
I believe flashing new roms and doing storage wipes can cause this file to be removed and created with false info.

WoZeR said:
Awsome job answering 3 questions with a random statement.
I know the phone stores the info about the battery in a file. This file includes the max charge the battery can charge too. There is a method somewhere on these forums that show how to drain your battery, wipe the file, then do a full charge so the phone can relearn the battery and the correct settings get saved.
I believe flashing new roms and doing storage wipes can cause this file to be removed and created with false info.
Click to expand...
Click to collapse
No... It has nothing to do with this. Every Android phone I've had... Regardless of whether it is brand new, stock, rooted, flashed, new kernel, anything... Doesn't matter.

May I know how many android phones you previously had?
not trying to flame btw.. but i dont have that case with my phone.. and this is my first phone

You have tokinda program the Lion Batt internal charger first, you charge them full->run till dead--> repeat process 2 times and then the system will be way more accurate. Try this and reply in about 3 days the results.

lagu805 said:
May I know how many android phones you previously had?
not trying to flame btw.. but i dont have that case with my phone.. and this is my first phone
Click to expand...
Click to collapse
John512 said:
You have tokinda program the Lion Batt internal charger first, you charge them full->run till dead--> repeat process 2 times and then the system will be way more accurate. Try this and reply in about 3 days the results.
Click to expand...
Click to collapse
You guys are still missing it. The ICON is not accurate but the internal sensor is. Jeebus. Look at these links... and it seems as my answer is in the first two sentences:
http://senk9.wordpress.com/2010/06/07/android-app-of-the-day-battery-left-widget/
http://www.androidjunkies.com/index...ets-you-keep-watch-of-your-power-app-reviews/

Honestly, if "it" truly bothers you, why not just put the overlay ontop so you get the "real" percentage.

It's work just fine for me, usually +/- 3% at most, works great on froyo.
Calibrate if it is way off
Sent from my HTC Magic using XDA App

I'm trying to understand how android calculates battery percentage, and from my testing it seems that the battery meter is hard coded into each particular phone model. This link seems to kinda verify this.
http://www.android-x86.org/documents/howtoconfigurebatteryservice
Does anyone know where in the system the battery file is located? Either the battery driver, or the algorithm it uses, or even a stats file. Anyone able to point me in the right direction? Thanks.

Daveenna said:
It's work just fine for me, usually +/- 3% at most, works great on froyo.
Calibrate if it is way off
Sent from my HTC Magic using XDA App
Click to expand...
Click to collapse
How abouts do you calibrate the visual battery indicator at the top of the notification bar to be within 3%??
Are you talking about something else like the battery charge status reading?
I've experienced the same problem as the OP on all my Android phones as well. It is a problem when you think you have 75% charge and all the sudden you are getting low battery warnings.

same here. Notification Bar battery is hilariously off.

akapoor said:
I don't seem to have an issue with it.
When it reaches 75%, my bar is 3/4s. When it's 50, its half-way...etc...etc...
Click to expand...
Click to collapse
oh yea? mine goes to nine percent...and takes forever for it to shut down. only when i shut down the phone or reboot it, does it not come back on. lol

I think I messed up my battery statistics

After I upgraded to lollipop, I used battery calibrator from the market to clear all statistics and start fresh. Today when I go to look at battery statistics it tells me that none are available. I'm certain something got cleared and cannot be restored. Can anyone advise what to look at to fix? I have root access.

Why clear battery stats?

Lethargy said:
Why clear battery stats?
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Click to collapse
I thought it would be good with the version change. It seems to have mysteriously come back after I accessed it a couple of times. So everything is now good.

funnel71 said:
I thought it would be good with the version change. It seems to have mysteriously come back after I accessed it a couple of times. So everything is now good.
Click to expand...
Click to collapse
Clearing battery stats is completely useless and does nothing except clear the stats. It won't affect your battery or anything else at all.

Lethargy said:
Clearing battery stats is completely useless and does nothing except clear the stats. It won't affect your battery or anything else at all.
Click to expand...
Click to collapse
Added to which, the stats clear every time you charge the device anyway

[P3110] Battery Charging Issues

Greetings;
Im having a weird issue (again - but with different device now).
After re-flashing about 4 or 5 times my p3110 with stock firmware (i never used customs) my battery wont charge to 100% anymore... It will reach 99% and wont reach 100%.
This happened to me previously with i9003.
Actually with i9003 everytime i flashed my device the battery would show a lower value each time.
Also; with i9003 i used Custom Roms; and used to " Erase Battery Stats "; wich such erase seemed to be the problem.
Since i've never erased my stats (to keep my device as close to factory as possible); what could be causing this issue?
Any experts on this matter that can provide me accurate info?
Thanks in advance.
Best Regards;
Richard

rgxHost said:
Greetings;
Im having a weird issue (again - but with different device now).
After re-flashing about 4 or 5 times my p3110 with stock firmware (i never used customs) my battery wont charge to 100% anymore... It will reach 99% and wont reach 100%.
This happened to me previously with i9003.
Actually with i9003 everytime i flashed my device the battery would show a lower value each time.
Also; with i9003 i used Custom Roms; and used to " Erase Battery Stats "; wich such erase seemed to be the problem.
Since i've never erased my stats (to keep my device as close to factory as possible); what could be causing this issue?
Any experts on this matter that can provide me accurate info?
Thanks in advance.
Best Regards;
Richard
Click to expand...
Click to collapse
The first thing that must be checked here is that wall charger and usb cables are not at fault. It maybe a coincidence that happened at the same time you started flashing stock firmware.
2nd depends on the firmware which you have chosen,
Different firmwares have different ways of working. Some have blocking modes, some have power saving modes, different set of features, different bugs as well too.
It might be a glitch altogether as well.
Nobody can explain this exactly accurate unless you try these options. Mine aee just aimed at pointing you to the right direction.
---------- Post added at 05:15 PM ---------- Previous post was at 04:41 PM ----------
One more point, tried discharging it completely? Then charging it in offline/online mode?
Now what about battery stats?
Erasing battery stats, well if you have searched on google about it, you would have seen mixed comments about it's affecting battery life, some says it does help, some says it doesn't.
Some feels It's better to do it and
some prefer better to leave it untouched.
My experience on same issue
I had 2 same sduos devices.
on both I used to flash roms
Custom, stock, everything.
Only difference was, on first one, I did erase battery stats many times.
And the second one I didn't ever touched it.
Result-well the first one, I got 4 other batteries replaced for it, and even the new ones would have trouble keeping the charge on the device after I wiped the battery stats. I couldn't blame the battery stockist for giving me 4 faulty batteries. Battery levels were erratic on stock, on custom.
Second one seems working pretty much nicely and i still haven't replaced the original one. Although on this, sometimes I have a glitch, where battery level would drastically go down after restarting the device and slowly build up to the same level without charging.
I know it's a glitch coming from the custom kernel side. Altogether it's better this way.

Greetings Billysam;
Thanks for your repply.
I aleady had checked both (Charger and Cables) they seem to be just fine.
Yesterday i decided to give my p3110 a good rest while charging and finally it charged completely.
Seems like the last 1% (to achieve full battery charge) requires a little bit more time than usual.
It may have been something related to the last flash i've done or due to constant use.
Stil... It is hard to point out what has really happened.
I was a little bit affraid that my battery or System got messed up somehow.
Do you know if flashing affects the Battery Stats in any way?

rgxHost said:
Greetings Billysam;
Thanks for your repply.
I aleady had checked both (Charger and Cables) they seem to be just fine.
Yesterday i decided to give my p3110 a good rest while charging and finally it charged completely.
Seems like the last 1% (to achieve full battery charge) requires a little bit more time than usual.
It may have been something related to the last flash i've done or due to constant use.
Stil... It is hard to point out what has really happened.
I was a little bit affraid that my battery or System got messed up somehow.
Do you know if flashing affects the Battery Stats in any way?
Click to expand...
Click to collapse
The last one percent does take extra time to reach that last 100% charged level.
The answer to your question is Yes and no.
Where is batterystats stored? It's stored inside root/data/system folder
When you flash or format your device data, it gets wiped too as well
So, Yes. cause it got deleted even when you only deleted data.
It affect battery No. Why?
What information that file has? Is it really important?
Information that you see in settings battery
It holds record of all the past history not the current ones. Or future ones.
Now you decide.

Greetings;
Superb Answer!
Exactly the answer i required.
That gives me whole new perspective, and confirms my theory regarding past and new files when flashing.

rgxHost said:
Greetings;
Superb Answer!
Exactly the answer i required.
That gives me whole new perspective, and confirms my theory regarding past and new files when flashing.
Click to expand...
Click to collapse
Further additional bummers
I was checking the batterystat in my device, and to my findings i saw, the file got modified after I full charged the device. So, it gets rewritten/modified/deleted after each full cycle. So, regardless of flashing rom or data, that file is constantly deleted, modified and created!!
Now suppose if I decide to delete that file holding my current charge capacity information, or the better so called "battery calibration" or "wipe battery stats" from cwm, which is nothing more than deleting it the same way from a root manager.
The file would be created again after restart, with new stats, which could be random or the lowest or highest values, according to the algorithm. Which would be seriously clueless of what the heck did happened to it!
That should clear why people claimed to have good and bad experience with their battery stats.
Even if their battery were good, the stats showed it bad and vice versa.
The algorithm is not at all easy to crack, let alone be calibrated. Even If someone would try to do it, Highly impractical, nor worth it. False claims.
Easiest was deleting it, thinking of it as a refresh, users would do it. And termed the coin calibrated.
"Got better", worked!!
No? Keep Wipe again and again.
So many apps were popular for calibration as well that time. Around 4 years back. I Can't remember their names but i did tried them as well!, in the beginning!!
I did learn from my mistake over the years, thanks to you I looked for answer inside me today. Although I stopped that habbit long ago, but you reminded me of digging deeper today
It should never be done.

Greetings Billysam;
Thank God i'm not the only one reaching such conclusion.
I've done pretty much the same steps; except i didn't knew what to check within the "battery stats" file, and i wasn't aware of the algorythm behind it.
I've tested pretty much those applications as well by that time with my i9003. (Back then someone said iDeleting Battery Stats / Calibrating had a "bogus" effect...)
Well.. I did noticed lots of differences each time i Deleted the " Battery Stats " - Either with CWM or through some application.
Sometimes Good improvement, sometimes terrible (until battery got fat, and stopped charging completely - Actually my i9003 is stuck at 60 or 80%, it simply wont go further).
After so many "Mistakes" on my i9003 i realized that the Battery Stats should be left untouched to prevent any " damage " / issues. I just didn't had a clue what exactly was behind that " Battery Stats " file ( Changes and Operations - or Code if you Prefer)
...
With all this being said and tested.
It seems Logical that Whenever we put a device charging, it should charge completely without interruptions.. Else it may or may not corrupt the file, algorythm or make the battery faulty.
Maybe these are the reasons why manufacturers advice people to fully charge their devices, and in some devices to "Not Fully Discharge " them.
Ofcourse, this is just a theory.

Battery life seems hit and miss

Hey,
my battery life seems to vary, maybe wakelocks? I am not rooted so I can't check. Some days I get 7-8 hours sot, however today (a day at university with wifi connection) my battery life is terrible, mobile network standby and Android system seem to be battery hogs.
Does anyone else have this problem?
Screenshot attached

I wanted to post the same thing... I haven't even installed all my apps on the new phone,
and I get terrible battery drain especially in standby, it's losing 20% overnight.
Then I factory reset it and it seems a little better now, but it's too unstable...
I was expecting better to be honest, and I only had it for less then a week...

How was your cell reception? Having bad reception has a big toll on battery performance, at least in my experience.
There have been reports of other users on battery drain with certain themes installed. What theme are running and could you compare with the default theme?

same here, not found the cause yet but tempted to do a full reset and start from scratch.
For wakelocks non root, download wakelock detector lite, you just enable it via a chrome app and usb debug, will have to do it when you restart the phone but thats not so often now days.

SLBoy said:
How was your cell reception? Having bad reception has a big toll on battery performance, at least in my experience.
There have been reports of other users on battery drain with certain themes installed. What theme are running and could you compare with the default theme?
Click to expand...
Click to collapse
In my house the reception is not very good, but that's why I set it to 2G and turn off mobile data, leave it only on Wifi.
Did not install any theme, default everything. But really, can a theme cause battery drain ?

Me too
The battery standby stability is not great is it?
I'm currently turning on "battery saver" when I am not using the phone - a slight pain, I know, but it does seem to have helped, a bit.
Will keep an eye on it and let you know (I am hoping to get away with charging the phone every two days rather than every day).
Will see if that proves possible - FWIW, for me, it seems that Ourlook and Bluemail are two key culprits. I have changed the settings on Bluemail from Push to Fetch every 15 mins, which has helped, but of course you cannot do this on Outlook. Well done Microsoft.
At this rate I'll end up using the "extreme" power saving mode

I know battery usage will never be consistent among different users, but the background drain is too much (based on what I see here and the other thread). If you can figure out your background drain you'll be sorted.
I know Dropbox had a bug that affected a lot of people recently, where it would keep the phone awake for hours at a time, they sorted it out in a BETA but not sure if its been pushed to stable yet.
I'd recommend everyone to download BetterBatteryStats, give it permissions via ADB and then use your phone normally until you reach 10% and see what is keeping the phone awake. My phone drains less than 1% an hour overnight (typically lose 4-5% over an 8-9 hour period.)
By the way, it is VERY common amongst the U11 and U11+ for mobile network standby to appear very high. It always does, even when I get 7-8 hours SOT, the mobile drain appears high. I think the battery stats are a bit bugged if I am honest. Sometimes it will say Spotify has been using battery in the background for 10 hours, yet it drains less than 1% and doesn't show up on battery historian. Other times it will say Nova is using 50% battery with 10 minutes screen usage (even though my phone has been running for 30+ hours). Doesn't always make sense.

My experience with battery drain is that I don't have any issues. As others have said, it will be different for different users depending on apps running in the background.
I have over 100 apps installed, some are running in the background, but I usually have 50% left most days. My battery drains really slowly. Couldn't be happier.

I think there is som bug with software
Hi there,
This is the problem I have with this HTC U11+ battery: if I don't reboot the phone after charging, kernel is always awakes
If you reboot your phone regularly you won't notice this.
I wonder if it is a common problem to U11+ and if HTC knows this.
---------- Post added at 07:00 AM ---------- Previous post was at 06:46 AM ----------
This is CPU
It has raisen to 100% during charging and never changed.

Seems more like a software issue.
I would try seeing what apps maybe like to wake up when charged (anything that backs up only when charging etc) or do a factory reset.

Galactus said:
Seems more like a software issue.
I would try seeing what apps maybe like to wake up when charged (anything that backs up only when charging etc) or do a factory reset.
Click to expand...
Click to collapse
I did factory reset, wipe cache, everything... Unfortunately there are many people with this problem since the last software update, so I think it's something HTC related that must be fixed.

AleCicc said:
I did factory reset, wipe cache, everything... Unfortunately there are many people with this problem since the last software update, so I think it's something HTC related that must be fixed.
Click to expand...
Click to collapse
I don't recall many people saying the kernel is constantly awake?

Galactus said:
Seems more like a software issue.
I would try seeing what apps maybe like to wake up when charged (anything that backs up only when charging etc) or do a factory reset.
Click to expand...
Click to collapse
Galactus said:
I don't recall many people saying the kernel is constantly awake?
Click to expand...
Click to collapse
Not here maybe but I'm Italian and I'm talking about an Italian forum where we are trying to understand what happens exactly.
By the way this is another thing I noticed
Of course any help would be appreciated. ?

Same here.
I have the China version U11+. After I upgraded to 1.24 via OTA, battery draining has become a serious problem, even in airplane mode.
I have solved it after I noticed the problem by doing a factory reset.

I have the European U11+ and I'm experiencing very fast battery draining after the latest OTA update too.
With me it's Google Play services causing the problem even in airplane mode and with extreme power saving on
handsome_hell said:
Same here.
I have the China version U11+. After I upgraded to 1.24 via OTA, battery draining has become a serious problem, even in airplane mode.
I have solved it after I noticed the problem by doing a factory reset.
Click to expand...
Click to collapse

kmitchpg said:
I have the European U11+ and I'm experiencing very fast battery draining after the latest OTA update too.
With me it's Google Play services causing the problem even in airplane mode and with extreme power saving on
Click to expand...
Click to collapse
Disable background data and motion permission and if you are rooted install magisk module dose on google play service

kmitchpg said:
I have the European U11+ and I'm experiencing very fast battery draining after the latest OTA update too.
With me it's Google Play services causing the problem even in airplane mode and with extreme power saving on
Click to expand...
Click to collapse
I don't think it's play services' problem… Because the maximum battery consumption is caused by the EPS.
Maybe it's a bug made by HTC. They may change some files after the update, but forget to deal with the case of these files have been generated. So my problem was solved after factory resetting.
I use Google apps too, they don't cause battery draining if everything goes well.

I reached out to HTC as I noticed an absolutely huge decrease in battery life. I was asked to calibrate the battery and that seems to have stopped the issues at the moment. Email I received had the following instructions:
Recalibrate the battery/charging logic with the following steps:
•Charge the device for at least 10 minutes
•With the device truly OFF while still being plugged into the wall outlet, push in and hold volume up and volume down AND power button, for 2 minutes.
•Let go. Device will boot up, and battery/charging logic are re-calibrated.
I tried that and then reset it and I've been getting about a day since then. It's definitely linked to the last software update despite what they'll try and say.

handsome_hell said:
Same here.
I have the China version U11+. After I upgraded to 1.24 via OTA, battery draining has become a serious problem, even in airplane mode.
I have solved it after I noticed the problem by doing a factory reset.
Click to expand...
Click to collapse
kmitchpg said:
I have the European U11+ and I'm experiencing very fast battery draining after the latest OTA update too.
With me it's Google Play services causing the problem even in airplane mode and with extreme power saving on
Click to expand...
Click to collapse
Aftab_khatri said:
Disable background data and motion permission and if you are rooted install magisk module dose on google play service
Click to expand...
Click to collapse
handsome_hell said:
I don't think it's play services' problem… Because the maximum battery consumption is caused by the EPS.
Maybe it's a bug made by HTC. They may change some files after the update, but forget to deal with the case of these files have been generated. So my problem was solved after factory resetting.
I use Google apps too, they don't cause battery draining if everything goes well.
Click to expand...
Click to collapse
I have to agree that something is happening with the software, and moreover, since last week the drain became really noticeable.
I was losing around 15% by night, so what I did to fix it was the following:
Clear cache of Sense Home
Disable the apps I was not using; for me those were:
Weather
HTC Account
Device configuration
Google Documents (didn't let me uninstall, but Sheets and Presentation let me)
Duo
Zoe Video Editor
Facebook
Facebook App Manager
HTC Alexa
HTC AppCloud
HTC Sense Companion
Instagram
Messenger
News Republic
VR Google Services
TouchPal​
Clear cache from recovery
After doing this, the drain was gone and I was getting 2%-3% drain overnight again, and so far, is behaving properly now.
Maybe you guys can try.

Galaxo60 said:
I have to agree that something is happening with the software, and moreover, since last week the drain became really noticeable.
I was losing around 15% by night, so what I did to fix it was the following:
Clear cache of Sense Home
Disable the apps I was not using; for me those were:
Weather
HTC Account
Device configuration
Google Documents (didn't let me uninstall, but Sheets and Presentation let me)
Duo
Zoe Video Editor
Facebook
Facebook App Manager
HTC Alexa
HTC AppCloud
HTC Sense Companion
Instagram
Messenger
News Republic
VR Google Services
TouchPal​
Clear cache from recovery
After doing this, the drain was gone and I was getting 2%-3% drain overnight again, and so far, is behaving properly now.
Maybe you guys can try.
Click to expand...
Click to collapse
I've ended up doing something similar- starting in safe mode I found that I wasn't getting the same drastic battery drain so I removed/disabled some apps, including HTC Weather and Touchpal, same as you. Now battery life seems much better and Google Play Services isn't causing a problem. I'm cautiously optimistic....:good:

When my phone battery 45% its dead

hello i have a problem with my xiaomi redmi note 2,im installing lineage OS 16 and its work fine but i feel weird about my phone battery indicator,when i using it its feel like my battery lasts a long time but turns out I was wrong,when my phone battery at 45% its dead and when i check the battery its empty ,so what should i do now ?.
I will be very grateful if anyone can help me

Look inside here:
How to Check Battery Health on an Android Phone
Wondering how to check battery health on Android? Learn how to see and monitor your Android phone's battery health.
www.makeuseof.com

jwoegerbauer said:
Look inside here:
How to Check Battery Health on an Android Phone
Wondering how to check battery health on Android? Learn how to see and monitor your Android phone's battery health.
www.makeuseof.com
Click to expand...
Click to collapse
I have checked this website but there is no method for my problem, besides this website only seems to tell me how to keep the battery healthy, besides my battery is not damaged,its the indictor this problem started happening after I installed the pie rom, before installing this rom I tried the oreo rom and my battery were the same before i switched to custom rom,is this the bug of the rom ?

Ubisoft3.0 said:
I have checked this website but there is no method for my problem, besides this website only seems to tell me how to keep the battery healthy, besides my battery is not damaged,its the indictor this problem started happening after I installed the pie rom, before installing this rom I tried the oreo rom and my battery were the same before i switched to custom rom,is this the bug of the rom ?
Click to expand...
Click to collapse
If your SOT run time is normal, the battery is most likely ok.
There are edits you can do if rooted but that's beyond my knowledge as to where/how to access them.
Otherwise try a battery calibration by charging to 100%, run until low battery shutdown, repeat.

blackhawk said:
If your SOT run time is normal, the battery is most likely ok.
There are edits you can do if rooted but that's beyond my knowledge as to where/how to access them.
Otherwise try a battery calibration by charging to 100%, run until low battery shutdown, repeat.
Click to expand...
Click to collapse
I already do that yesterday till today there is no change

Ubisoft3.0 said:
I already do that yesterday till today there is no change
Click to expand...
Click to collapse
Use the battery voltage to estimate the charge state of the battery.
If all that's wrong is a misreading you could just adapt to it.
You can try a hard reset (simulates pulling battery) and clearing the system cache but I doubt that will help. Worth a try.

blackhawk said:
Use the battery voltage to estimate the charge state of the battery.
If all that's wrong is a misreading you could just adapt to it.
You can try a hard reset (simulates pulling battery) and clearing the system cache but I doubt that will help. Worth a try.
Click to expand...
Click to collapse
When you say hard reset do you mean reset my phone to factory settings or delete all of my data from twrp ?

Ubisoft3.0 said:
When you say hard reset do you mean reset my phone to factory settings or delete all of my data from twrp ?
Click to expand...
Click to collapse
It simulates pulling the battery and doesn't touch any data.
It's usually done but holding the volume control and power buttons down until it reboots on my N10+ if I recall correctly. It's hard to find this with a Google search but the instructions are out there, somewhere.
Of course if you have physical access to the battery you can simply disconnect/reconnect it.

blackhawk said:
It simulates pulling the battery and doesn't touch any data.
It's usually done but holding the volume control and power buttons down until it reboots on my N10+ if I recall correctly. It's hard to find this with a Google search but the instructions are out there, somewhere.
Of course if you have physical access to the battery you can simply disconnect/reconnect it.
Click to expand...
Click to collapse
okay I'll try it later but if it doesn't work I'll go back to oreo again, and thank you for the help

Ubisoft3.0 said:
okay I'll try it later but if it doesn't work I'll go back to oreo again, and thank you for the help
Click to expand...
Click to collapse
On rooted phones there's a file edit you can do to fix that. I've seen it on XDA before. It doesn't apply to me so it was a curiosity.
Sorry I can recall the thread or file name.
Try this.
Try this Google search: fix battery percentage,xda rooted
Or something similar.

blackhawk said:
On rooted phones there's a file edit you can do to fix that. I've seen it on XDA before. It doesn't apply to me so it was a curiosity.
Sorry I can recall the thread or file name.
Try this.
Try this Google search: fix battery percentage,xda rooted
Or something similar.
Click to expand...
Click to collapse
My problem solved,its because the kernel when i try to reinstall my rom without installing the KERNEL then when i try it, my battery back to normal .