yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab 8.9 General] krunel:
On the chance the following may be helpful to someone: opening up the tablet & removing the battery connection for a few minutes seems to do the calibration trick. I realise this approach is not going to be to everyone's taste but for those that don't mind this takes a few minutes' effort.

Thanks to http://xdaforums.com/showpost.php?p=33001931&postcount=1215 where I saw this approach suggested and also to http://www.youtube.com/watch?v=thTt6G27NV8 that shows how to crack open a 7510 & at 2:54 shows disconnecting the battery.

Background: I have a 7300, was on kk's CM10 from early October, the battery started to go haywire. I switched roms & nandorids a few times to see if that helped. It didn't - the roms drained within minutes & were showing zero % whereas voltage_now was showing > 4000000. I switched to kk's CM10 20 Oct battery fix build - same problem, i.e. what this thread is all about. Using the battery disconnection approach (it really is easy) seems to have done the trick. I've had video going on the tab for ~30mins the battery drain is 4%.

EDIT 30 Oct:

I noticed some more entries since I posted & just wanted to reassure anyone who's having problems with calibrating via battery drain that the hardware approach does work and is easy and quick (and fun). I've been on the battery-friendly CM10 from 20 Oct (and the later CM10 releases). My tab gets a fair bit of use & has been charged many times during the last 10 days & battery is good.
[Galaxy Tab 8.9 General] chongox:
Many thanks for taking the time to create the guide & also the Hardware solution seems a good idea

However I wish I had the guts to crack open that baby, but honestly I hate anything related to using tools

My battery started to play stupid, but after this calibration thing it goes to 4% in 25'

I wonder what are the other choices rather than open the tab? go back to HC ? (teh horror!!!!)

I was in a ICS sking rom

now Im in KK CM 10 (that is amazing fast and stable)

Any help would be appreciated
[Galaxy Tab 8.9 General] fred_be9300:
Your safest bet is to move to a stock p73x0 ICS.

Once you're on that, it should be easy to get your battery to behave.

Alternatively, you can read the last 7 days in the cm10 thread. Latest Rom may fix or improve battery functioning. Or use c-o-m special kernel from the weekend. It too may fix battery issues. Can't be more specific, there were a lot of new drops in cm10 thread lately, and it will take a bit for the dust to settle there.

Sent from the road
[Galaxy Tab 8.9 General] chongox:
Thanks buddy nice to have a plan of action now!!!

Now If im not wrong the ICS of sking was the port from kk just rooted , so yeah that is when the battery problems started.

I been following the cm10 discussion and I'm sure i have one of the latest versions , still the problem .

I would give another chance to the calibration thingy, try the kernel of C-O-M and if case is not working I would go back to ICS until is fixed.

Many thanks
[Galaxy Tab 8.9 General] stevb:
Where could we find c-o-m kernel?

Thanks!

Inviato dal mio GT-P7300 con Tapatalk 2
[Galaxy Tab 8.9 General] fred_be9300:
Hmm. Safariking is creating so many variants of ICS ports and stock, that confusion comes easily.

Anyway, if you have p7310, then you could get the clean stock p7310 ICS from sammobile, or floating around here (odin flash)

If you have p7300, you can still use the same p7310 stock ICS (you just don't have 3g). This is my current situation for 6 weeks, coming from kallt_kaffe's port ICS with miscalibrated battery.

Or you can flash the stock ICS that tracid pulled out of an OTA file. It's stock Samsung, but just not publicly released for unknown reason. Works well, per general opinion. I just don't need 3g now.
[Galaxy Tab 8.9 General] RuiFerraz:
Hello everybody, I'm Rui and this is my first post here.

I'm Portuguese, so sorry for any mistake in English.

My problem is that I've bought a Galaxy Tab 8.9 and it becomes to have problems with the battery. It lasts about 1 hour or so.

I've done this method once and it doesn't work. Now I'm trying again. The thing is that my tablet is in the warranty but it is already rooted. I'm thinking that I need to unroot it and give it back to warranty if this second try dont solve the problem. Is there any way to unroot the device?

Thanks anyway. :D
[Galaxy Tab 8.9 General] boscorama:
Welcome.

First we need to know what model of tab you have. Then we need to know what Recovery and/or ROM, if any, you installed and how you gained root.

Once we know all that we'll have a better chance of helping you.

(BTW, if you used nirogu's excellent toolkit thread to do any of this, he mentions how to unroot there too.

http://xdaforums.com/showthread.php?t=1406137 )
[Galaxy Tab 8.9 General] i04055:
Hi, I have the same battery problem here... I'm using Tracid's official ICS and A1 kernel....

Yeesterday I tried this procedure and see the voltage_now showing 40xx while my battery show 0% in android...

I tried the procedure step by step and wait for voltage_now show 335x and turn odd the tablet for an hour before charging it for about 6 hour.

this morning I unplug the charger and wait for about 2 hour before boot it on.. After 1 hour of use, my battery is 45% now...

what should I do? should I redo the prcedure?
[Galaxy Tab 8.9 General] fred_be9300:
What version of a1 kernel? I believe you need 1.7.3, all other have battery problems...
[Galaxy Tab 8.9 General] Henu:
Hello, another silent reader raises his hand and cries for help here.

I decided to flash kalltkaffe´s CM9 (Oct.5th build) and it ran quite smoothly for a week. And then, the Battery problems started. So, as I was aware that it might happen (had been reading this thread since the beginning) I followed the instructions and tried to re-calibrate.

First attempt didn´t work, so I guessed my battery had still too high voltage as it was 3650. What happened instead was that the drainage just got faster. So, I emptied the battery in CWM into 3300 until it didn´t even boot to CWM anymore.

1.5 hours of waiting, 6 hours of charging, 4 hours of waiting. Booting up, tab starts at 97%. 10 seconds later it´s 95, ten seconds later 91%. The drainag is about 1% / minute now. And here´s the fun part: I flashed back to HC and it was even worse. So I´m pretty much out of ideas right now. Would anyone have an idea how to proceed? The voltage seems correct all the time, as expected, yet the communication between the chip and the OS is horribly bugged.

Here are some stats:

Rooted (obviously) P7300, Nordic (Finnish) version. No Sim lock whatsoever.

HC, stock version:

Baseband Version P7300XXKJ6

Kernel Version

2.6.36.3

dpi@DELL151 #1 SMP PREEMPT Fri Jan 27 16:30:46 KST 2012

Build Number

HTJ85B P7300XWLA2

ICS, Cyanogenmod 9

Baseband Version P7300XXKJ6

Kernel Version

3.1.10-cyanogenmod+

kalltkaffe@VirtualUbuntu #2

SMP PREEMPT Fri Oct 5 14:29:28 CEST 2012

Build Number

cm_p5_userdebug 4.0.4 IMM76L eng.kalltkaffe.20122005.181906 test-keys

CyanogenMod Version

9-20121005-UNOFFICIAL-p5

CPU

ARMv7 Processor rev 0 (v7l)

ClockworkMod

Version 6.0.1.0

At this point, my battery voltage is ab. 4050 mV and I have a whopping 46% of battery left according to the OS. Please help if you can, as I´m starting to get quite frustrated and desperate. :/

Thanks,

Henu,

Finland

PS: How fast should battery voltage go down as a general rule of thumb? Mine tends to diminish about 100 mV per hour now with reboots and minor settings browsing/ changing (no active use otherwise). This would indicate fastly counted as about 60 hours of rather idling usage with a screen on- sounds reasonable to me, right?

Oh, and now the tablet just shutted itself while the voltage was about 3960. Hurray.

*cry*

PPS: Another thing struck me: I´m 100% positive I had CWM 6.0.0.8- now it seems I have 6.0.1.0. Any chance updating Rom Manager would had actually changed this while updating it via Play Store? Could it even be possible? And when I flashed CM9, I flashed it via CWM 6.0.0.8. Technically, even though CWM might be behind this, it definitely shouldn´t affect the Rom after installation anymore, roiiiight...? *confused*
[Galaxy Tab 8.9 General] fred_be9300:
The CWM 6.0.1.0 was distributed by kallt_kaffe under filename 6.0.0.8 (...

accidentally)

Redo the battery calibration now that you are on a battery-safe Rom.

You could also flash a stock ICS, and calibrate on that.

You should report this on cm9 thread. Probably it has the same battery issue that plagued the cm10 when kernel 3.1 was first introduced on it... Just that cm9 is receiving next to no attention, now that cm10 is getting better. Also, kallt_kaffe and pershoot (devs of cm9, cm10) have said some problems in cm9 are hard to fix... All of the above means cm9 is almost an orphan right now

Ps: don't despair... Your battery will start behaving again... It just takes a bit of patience
[Galaxy Tab 8.9 General] i04055:
I used A1 1.7.1... but now I tried to recalibrate using CM10... Is it alright?
[Galaxy Tab 8.9 General] Henu:
Thanks a lot! :)

But as some things remained me rather unclear, I´d have some more questions concerning your answers if you don´t mind....

First of all- is there a reason why the battery calibration is also screwed in stock HC now? Afaik, they use different kernels and don´t affect each other´s calibration at all, or have I misunderstood something? Or is it that once the battery is calibrated to hell, it means that all roms are affected unless you calibrate it with a working rom again? I haven´t calibrated it with stock HC for now, always with kk´s ICS.

I´ve now restored stock HC and am currently discharging my battery in CWM. So...

I take it as CM9 wasn´t battery- safe but that stock HC I have is? And that should be used for calibration?

What would be your advice here as the stock ICS? Tracid´s perhaps? And, would the procedure be the following:

1. Make a factory reset, wipe everything from SD to Dalvik and back

2. Install Tracid´s ICS

3. Do the battery calibration 1+5+1 hrs- thing

4. Wipe battery stats (?)

5. Make sure Tracid´s ICS is calibrated

6. Flash back to my Nandroid backup of CM9 I have from yesterday

^ or is my backup "plagued" and I have to flash a completely new CM9? Or not even CM9 as it has problems with the kernel but something else, like CM10?

Would you recommend me hopping straight into CM10 then? As in, ditching CM9 completely in order to avoid the battery problems? The thing is that I´d love to have a working custom rom, preferably CM- which I wouldn´t have to install again in two weeks as it would render all my work with customizing the tablet useless. :(

I´d just want to have a working rom basically without having to flash a new one from scratch every three weeks or so, if you get my point. So, if using CM10 would demand me wiping my tablet once in a month, that is unfortunately out of question for me. Unless, of course, you can just update OS "on top" or rollback if needed without having to wipe the whole tablet, losing all my own customization and apps/etc. Even though I´m not a complete noob on Android, this has never been clear to me, to be honest. :D

Thanks for your time, you have been very helpful already! It´s just that I bought this tablet in July, and it remained pretty much untouched since then as I was waiting for working CM9 ´til October and now when I finally thought I got it, it worked for two weeks and then got screwed..so you can probably understand my reactions, especially when flashing the stock rom didn´t help either.

EDIT: I cannot post anything to the dev forums yet, so if someone is in touch with KK or Pershoot before my magical limit of ten posts are up, I´d (and prolly them too) appreciate letting them know about this.
[Galaxy Tab 8.9 General] fred_be9300:
Pretty much... A few have said they managed to calibrate on a "battery-broken" Rom (especially back in the day of using kallt_kaffe's ICS p7500 ports), but most have not.

Sorry, that's all I have time for now
[Galaxy Tab 8.9 General] Henu:
Thanks, I will try it- going to flash Tracid´s ICS then. Let´s see how it goes....

Wish me luck. :eek:

EDIT: Tracid´s ICS installed smoothly. Got about 100 mV off before the battery went from 40% -> 0% and now I´m sitting at CWM with 3797 mV...gonna be a long night tapping it every 45 minutes. :D Meanwhile I took the time to get myself a cheap electricity- timer- adapter so I can do the charging- thingie overnight. I´ll just plug it in to the socket, and adjust it to go on after 2 hours of no power, stay on for the next 6 hours and go off again. Let´s see if that works!

EDIT2: The abovementioned ICS seems to have corrected my battery calibration. I´m now letting it sit idle and thus far 3883 mV / 79% seems legit to me. I´m going to let it drop until 20%, charge full and repeat the cycle a couple of times in order to make sure the bad behaviour doesn´t start "later", like it happened with CM9.

For anyone having time to check out my questions, please read this last one as that´s the most important for me:

EDIT3: The tab was set running with everything on (like in the first boot, bg services etc) + 3G. Screen brightness at max, constantly on.

The battery lasted a bit more than five hours, I started charging when it reached 4%.

The weird thing is, that according to Battery Monitor Widget and ABD, my voltage calculations were a bit different they probably should:

17:00 - 4010 mV - 100%

22:05 - 3547 mV (Battery Monitor Widget number) - 5%

(plugged the tab into PC, used ADB)

22:15 - 3594 mV (ADBnumber) - 4%

Shouldn´t the numbers be more than 4010 when fully charged and less than 3550+ when discharged? Is this still somehow bugged, or will it start behaving better after some time? Right now these numbers feel a bit awkward to me still. Could anyone confirm if these should be correct?
[Galaxy Tab 8.9 General] Henu:
Something is seriously at least very akward.

I´ve now frustrated myself to death with watching the stats like a madman + looking for more info about this for two days. Current situation is that the tab is taking with all battery- consuming stuff at max about 19% per hour, running Tracid´s ICS. It seemed ok at first, but then I marked the numbers up as explained in previous post. Battery lasted about 5.5 hours each session. Which, I think, is not very good. But that´s another thing.

Battery Monitor Widget tells the following: Min Voltage 3225 - Max Voltage 4065.

On use- test #1 gave me Max Voltage 4010 and at 5% it was still 3547

On use- test #2 gave me Max Voltage 4063 and at 1% it was 3540. (ADB gave 3568 at 1%)

So, definitely too high still when percentage reaches close to zero. However, I went to CWM to drain the rest. For my surprise, CWM shut itself after 30 minutes and didn´t boot up anymore. So I charged two minutes, plugges it into ADB and....what the heck, suddenly the voltage was 3272.

How is that possible that the battery voltage goes from 3568 to 3272 in 30 minutes in CWM?

I´m starting to think there´s something flawed in my battery instead. I wiped the stats (yes, I know it doesn´t help but still, heh) and am now doing the calibration procedure once again. After running a 100% -> 0% test and nothing has been changed, I think I´ll go Odin -> retail version and try the calibration once more.

If that doesn´t help, I take the damn thing to the warranty repair, explaining that the battery chip is broken which probably is the truth if even going back to retail doesn´t help.

EDIT: What the stevejobs, after starting to charge the tab, it went accidentally on. So, I thought "ok, here went the calibration down the drain, great". So I decided to keep it on just to see what numbers I´d have. After 6-ish hours, my battery climbed to 4100 mV at 100%. Then I switched it off and it started charging again, even more. I switched it on after a couple of hours and I had almost 4200 mV. I´ve now ran Nyancat (!!) Youtube for 1 hour with wi-fi: 9% per hour. With 3G, same result. How is this possible? Maybe my tab got scared of my threats? :D
[Galaxy Tab 8.9 General] lrcquest:
Follow the op to the letter as much as possible... It's the only way out of this ordeal.
[Galaxy Tab 8.9 General] zittergie:
Battery drain when completly turned off

Hi,

I'm on KK's CM10 (11-11) and i have another battery problem. When in standby or in on position, the tablet seems to work fine.

But when I turn off the device, it seems to rapidly drain the battery (almost empty in one night).

Anyone else with this problem, or a solution?

Just as a reference:

18%: 3615
[Galaxy Tab 8.9 General] zittergie:
Solved: Battery drain when off

Found the problem. After removing the apex launcher, the problem was solved.
[Galaxy Tab 8.9 General] smehks:
My battery seems fine but when i shut the screen off and just leave it in "sleep mode" it for some reason uses the same amount of energy, i can watch a movie etc without much battery loss but when i just klick the powerbutton to shut the screen off the battery is empty in the morning, even if it was full when i went to sleep... I had this problem with the cm and aosp roms but not with the overcome rom, with overcome rom it could be in standby for a week and still have a good amount of battery left...

Anyone have the same problem or know how to fix this? :)

And its not just a calibration? because the tab is completely drained after one night of standby with full charge :/

Same problem as zittergie mentioned 2 posts upp but not with the tab off but standby mode instead.
[Galaxy Tab 8.9 General] kfawan4n:
how to check battery voltage in terminal or adb shell didnt get this step

hi thnx a lot u did a very great job but my prob is this am new to android can u help me checking battery voltage in terminal or adb shell i installed sdk in my computer i am till sdk android-windows platform-tools and adb

after tht whn i type cat/sys/class/power_supply/battery/voltage_now thn no command found plz help.
[Galaxy Tab 8.9 General] 21raja:
Based on my experienced, I did make it drained with let it ON while in CWM with battery less than 3400. So, it will complete drained (your tablet will shutdown) and let it for 1 hour just like the instruction..

After 1 hour, i charge it for 5 hour (make sure you count the time), and discharged it and let it sit for a while for 1 hour again..

After that, i turn it on, and the battery back to normal..
[Galaxy Tab 8.9 General] herbertsilver:
Tip for running battery out faster for recalibration

Hello there,

I've had the same issue 2 times at first time i left it on in CwM until the battery was completely exausted, but that takes too much time.

I found out that if you turn the tablet on while connected to the charger then quickly remover the usb cable from the charger and connect it to the computer the tablet will not self shut down nor charge, because usb won't charge it. So you can keep using it ultil it goes off. To make it even faster u can run a movie or a very demanding game.

Hope it helps someone.

See ya.
[Galaxy Tab 8.9 General] yadayada01:
Stupid question:

If I flash another rom, will that solve it? Guess not, but Im thinking of installing Jelly Bean anyways.
[Galaxy Tab 8.9 General] yadayada01:
Problem.. I have CWM 6.0.1.0 and I dont see any numbers at all. How come?
[Galaxy Tab 8.9 General] Abrown0920@gmail.com:
There is an app called minimalistic text that is a widget creator and it has battery voltage as an option to have your battery voltage show up as a widget. I dont know how to use terminal emulator so i am using this.

View attachment 1565500
[Galaxy Tab 8.9 General] nutstan53:
I can't drain my tab with 3400, it shows higher than 3700. Even when I got it to 15 percent, it showed 3694. I did all the steps but it didn't fix the problem, any help guys?
[Galaxy Tab 8.9 General] fred_be9300:
You need to drain in recovery. (repeatedly cause it shuts down every hour)
[Galaxy Tab 8.9 General] huynhson:
]Dear all

I had a problem with my tab charging and i need help from all. When i plug my charger, the tab can't charge, it show an "X" on the battery icon like you connect to the computer by usb, but when shut dow the, it can charge, i don't know have a crash with software or hardware problem, but the battery used time is good. i use android 4.04, baseband I9103XXLQ3, this rom made by Tracid, this rom is really good for me, just had this problem, but i'm not sure this cause of the rom or not.Thanks so much[/QUOTE]
[Galaxy Tab 8.9 General] Idlekilla:
Or just stop on the screen where you choose cwm or downlod mode and let it drain there without having the 1 hour shutdown cycle.
[Galaxy Tab 8.9 General] Jaggle:
I just disconnect the battery from my tab and let it rest for a few minutes and connect it again. For me it worked perfect and cost me 15minutes. :D

Verstuurd van mijn GT-P7310 met Tapatalk
[Galaxy Tab 8.9 General] lastiko:
how can you disconnect the battery from the tab? do you disassemble it first?
[Galaxy Tab 8.9 General] yadayada01:
Tried this yesterday, didnt work :( I didn't take any shortcuts, far from, I usually took longer on each step then recommended. Maybe that's the problem? Or maybe I need to change rom too? I have kallt_kaffes ics 4.04 IMM76D.XXLQ8
[Galaxy Tab 8.9 General] fred_be9300:
Strongly advices to change ROM. See my reply to you in kk's ROM thread
[Galaxy Tab 8.9 General] xyrovice:
Quick question...maybe odd:

Will this procedure/fix work on a completely different device? Say, a Sony Xperia Acro S or HTC One XL?

I always seem to get in this rut where I flash a buncha sh*t and get an improperly calibrated battery & thus a false reading in the ROM. Battery Calibration apps in the market don't work obviously (batterystats.bin is not the problem).

If this might work with other devices to fix battery readings I'm gonna be EXCITED.

Afterthought: Could the "quick charge" feature in a kernel contribute to potentially botched readings? Turning if off anyways...Russians don't use fastcharge either I bet.
[Galaxy Tab 8.9 General] Jaggle:
Yes, and it's very easy. There are some videos on YouTube that shows how to do it. There are no screws involved.

https://www.youtube.com/watch?v=SdFxzq40Niw&feature=youtube_gdata_player

I use a guitar plectrum to do the trick for the backcover. Then after I disconnected the battery I let it rest for a few minutes before I connect it.

Verstuurd van mijn GT-P7310 met Tapatalk
[Galaxy Tab 8.9 General] yadayada01:
What do you mean by "flash your backup " ? Because this guide didn't work for me but I'm trying again now.

Ye but unfortunately it seems to have a few bugs itself http://xdaforums.com/showthread.php?t=1895496 ? I think I'm gonna wait to the really official ICS comes out :)
[Galaxy Tab 8.9 General] josiniscal00:
Ty
[Galaxy Tab 8.9 General] yadayada01:
Amazing.. second try and now it much more worse than before. 4.160 V and it shuts down immediately.

Help anyone? :(
[Galaxy Tab 8.9 General] picasco:
for me it definately helps do disconnect battery. after that it shows correct percentage value and behaves normal. but unfortunately it does go crazy after each recharge cycle.

what i found out, in my case i'm using juice defender which does switch to airplane mode as soon as screen is off. if i configure JD to enable radio or even wifi in charge mode then it does charge and report battery level correct.

maybe it has something to do with deep sleep while charging. haven't got a look at this yet. so anyone who still has this problem could try to charge the tab while preventing it to go into deep sleep.
[Galaxy Tab 8.9 General] binkyubk:
question for all tech Gurus

So I was able flash this Rom http://xdaforums.com/show....php?t=2398003 with out any hitches. now my problem is that my p7300 isn't charging. And it's so low that it won't start up. how do I get it back up?
[Galaxy Tab 8.9 General] iZLeeP:
A1 Kernel V1.7.3 3g

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