yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] pinghsien422:
Yeah, it's working great now! For the time being I'm just using stock ROM though. Maybe one day I'll flash back to pershoot's to see if everything's fine again.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
Good. And btw, I'm using latest pershoot's kernel and see no problem.

I was looking at source code of fg driver and find nothing that would definitely caused that kind of issue, the only code path I suspect is USB charging function. Or it might be as well just a hardware glitch.

I am saying all these to explain that mythical topic of battery calibration thingy which was prone to so much assumptions and speculation by persons knowing a very little on the subject.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Jay Rock:
Nice I've been having some battery issues too. I'll make sure to try this soon.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] macoy:
I get ridiculous fast battery drain after flash bonsai rom, guess because it enable usb charging ...the system reports 0 battery and auto shutdown while its actually half full. So i boot into recovery leave it all night. I woke up this morning and found the battery was completely drained so I plugin the charger till it says 100%,leave it unplugin for about an hour (not sure if its neccessery) and now my battery is back to normal!
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] thekendog:
Phantom and Task's new ROM has an auto-calibration script. The ROM is fast as hell too.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
"leave it unplugged for about an hour" - is necessary (actually twice, when it's empty and when it's full)
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
There are no scripts or apps for battery calibration.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Jay Rock:
That's what the thread says is in the ROM.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Grommish:
Probably jusy wipes the batt stats. that is NOT a calibration.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Jay Rock:
idk seems better for me than task650s v7.2
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] hosagot:
Hi all,

Just wanna confirm that Vlad_z second solution worked for me. Though it be nice to have the steps posted on the first post. Kind of avoid having to read all the posts for other noob like me.

I tried the steps on the first post and it didn't work and decided to read all the posts on this thread.

Then I tried the other solution vlad_z posted and it worked!

Battery seems to drain 1% every 5 minutes. I was experiencing 1%/min before.

Thanks again for the solution!
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] focusnick:
Hi everybody!

Thanks to Vlad_z for his investigation and working solution posted on the 5 page of this thread. It saved me from expensive time loss while dealing with service.

Just wish to add my history about this issue and how it was solved:

Battery started to drain ("full" capacity was drained through the 20 mins) after being fully discharged during one of the nights.

I was on the stock ROM and pershot kernel with overclocked CPU via setCPU (1.4GHz) at that moment. First of all, I tried calibration method twice from the 5th page of this thread. It wasn't worked for me for the some reason.

After that I did a full wipe and restock with Overcome 1.2.3 ROM + pershot kernel. Battery still drained. So I tried to calibrate it for another 2 times and it worked!

I should notice I tried to calibrate it at the 4th try a bit differently comparing to the first three.

At the first three attempts I charged it from 0 to full capacity while Android wasn't run - I just attached the charge to the completely turned off device.

But at the last, working 4th try, I started the Tab before attaching the charge cable - so it charged while being fully loaded. I don't know is this is a just coincidence or not.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] ellecsor:
Is it normal to have 15% battery loss for being completely idle/asleep for about 12 hours?
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] focusnick:
Looks like something eats your battery in a background. I have only 1-2% loss over 9 hours being idle now. Check if your wi-fi is disabled when screen is locked...
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
Same here. 1-2% overnight. Something is preventing your tab from going to deep sleep.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] sudhirkhanger:
When you are fully charged? Are you supposed to let it plugged in and shut down for an hour or so? Or unplug it and leave it turned off.

Should you use tablet during calibration? Will rebooting while calibration disrupt it.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
First, when it discharged, let it be off for couple hours. Than charge it... it does not matter if it booted or not. Then unplug it, shut it down and let it be for couple of hours.

Those couple hours of rest when tab is turned off needed to guaranty stable/constant voltage on battery for chip to start measurements of "open circuit voltage".
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] ellecsor:
Thanks. I'll try to calibrate the battery tonight using your method. I'll also make sure to have wifi turn off when the screen is off.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] yokuoh:
Hi everyone

Can someonle please tell me does this fix work for the original 7" model aswell?

Found this thread and only just realised it's on the 10.1 board.

:confused:
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
It depends on what fuel gauge chip is in use but generally this is a common method.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] yokuoh:
Thanks very much.

I'll give it a go tonight.

:)
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] hebbe:
tried the first solution. now it seems that my battery won't charge to a level above 60%.

will see...
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] yokuoh:
Works on GT P1000

Just thought to confirm that this fix also works on the P1000 original 7 inch tab.

Got an up time of 32 hours now and still going!

Might be worth mentioning on your OP.

Many thanks for the fix!!
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] royeight:
My battery usage is:

Android OS: 50-60%++

Display:10-15%

It should be the other way round, right?

And the battery is draining real fast! Any experts knows how to fix this?

Runnng on Android 3.1.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
How fast? All information needed to diagnose and recalibrate battery right here in this thread.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Icecold2012:
Hello!

I am running Overcome 2.1.1 on my gtab 10.1 with pershoot kernel (flashed back to the stock overcome kernel 1 hour ago).

I think there is something strange with my battery. When i am surfing on the internet he need nearly 1 percent of battery per 2 minutes or something like that.

And when i am in standby, the battery drains 3-4% an hour.

I deactivated nearly every background synchronizing app, deactivated the wlan in standby and so on. And backuped my overcome 2.1.1 with its stock kernel, but nothing improved.

Could recalibrating help me getting a better battery life?
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
1% in 2 min or 100% in about 3 hours. 7000mAh / 3 hours = 2.33 Amp current consumption - kind of too high even with 100% of screen brightness.

So, calibration should help.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Icecold2012:
Thanks for the perfect instructions!

just made the calibration like you said on page 5 and now 1 % battery drainage in 3 hours or more!

Thanks very much!
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
glad I can help.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] nichu010:
Hi,

I have tried all these techniques with nil effect...was using stock rom before..tried it with overcome series also...plz help
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
Give us some more information then that.

PS: if you were followed these instructions (with understanding what are they for and how it works in general) with nil effect then I'm afraid you have got hardware failure.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Hobbz:
Hi all,

Just to let you know the page 5 method worked wonder for me. Thx Vlad !

I'm running with stock ROM and latest Pershoot's kernel. Seems to me the problem started when i flashed an older version.

Ps : just registered for this post and discovered the noob video, pretty good stuff :)
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] nichu010:
could u plz sent me that link for stock rom with pershoot kernel?

i own a 3G + wifi tab

---------- Post added at 01:03 AM ---------- Previous post was at 12:58 AM ----------

Add: before, the tab used to say battery low when charge reached 50%... after i have done wat is said in page 5, it only said it when battery reached 40 %......:)
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] AntonioM:
hi all,

I have a similar problem with my p7500.

Latelly my tab is indicating 60%/70% and after browsing on internet for a while, I have a bip and a message indicating only 3% battery left. I restart the tab and battery gets back to 60%. But after a while, I have the message of low bat again.

Also, when I charge the tablet (shutted down), it indicates 100%, but when I turn it on, it indicates only between 70 and 80%. I have to continue charging it for a while until it hits 100%.

I tried the method of page 1 and 5 but without sucess.

The tab is completelly stock( it's about 1 month old) and updated to 3.1 through the update option in settings.

Thanks in advance for any kind of help and sugestions,

Antonio
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] aieromon:
Thanks for the tips.They'll come in handy when I need to flash my device.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] choppa26:
Battery issue

I hav a 10.1 wifi only tab n I am on the starburst rom n kernal. My battery life is killing me i get with my screen bright totally low and wifi on i say i get like maybe 2hrs out of it till it dies then when i cut it back on aggain its back to like 60-70% batt life n when i lewt it drain to 0 n charge it the charge batt showsits already ha;fway charged i wish i could get battery life like u guys can u help i tried to fix this issue with other thread saying charge n dnt touch for 5 hours n let it sit on for 1 hour but soon as i turn it on fully charged just lookin at a few sites i go frm 99% to 90% in like 10-15min plz any help is welcomed.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
@Antonio and choppa

Those are symptoms of bad battery calibration. Try to repeat calibration procedure couple more times. For some reason chip might did not get calibrated the very first time.

Make sure you are following procedure:

drain it;

shutdown and let it sit for 1 hour;

charge it back;

let it sit for 1 hour;

boot up and test if battery got calibrated.

edit: use wall charger not PC USB port.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] sl2222:
I'm having a similar problem. Right now i am trying the calibration method below that was recommended.

Hopefully that will correct my problem.

I do have one question tho. when i go into recovery mode and try to wipe the battery stats bin it doesn't do anything. I wiped the cache and then when i wipe the battery it just goes back to the recovery menu.

using in paris v5

any ideas? thanks

Well, here we go:

charge tab somewhere in between 80 and 100%.

edit: remove charger

shutdown tab (not put in hibernate/sleep) for 1 hour.

edit: turn tab on and run it for 30-40 min. or whatever it takes to drop charge to 40-50%.

shutdown tab again for 5 hours (overnight).

turn tab again and check... you should be fine now, charge it again 100% and use as usual.

That should do correct chip calibration.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] choppa26:
K in pm u say 5hrs but i will try this method u have posted in here. Damm im ticked my 32g not actin rt but ill will keep trying this method i got everything on to drain it i know u said it has to be lower than 3700 in Terminal but the only way to really check it is to put the plug to it to give a lil power to get to TE then pull it out wait bout a min to punch keys to get reading. I did get it down to 3646 in TE b4 i started the process you U pm'ed me imma try this method now i did make a backup of my bone stock rom n etc. Please stay in touch to help out.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
Where did you see I was recommended to wipe battery stats file?

And if you would read further down this thread here is an update on callibration procedure:

1. Go into CWM and let it sit till battery in terminal will show less then 3700. The less you can get it the better. 3400 is probably absolute minimum. You can check periodically booting into android and using terminal or just adb or just let it die sitting in recovery mode.

2. shut down tab and let it sit for 1 hour.

3. plug it to wall charger and charge it for 5 hours.

4. Disconnected charger and let it sit for 1 hour. Tab should be off.

5. boot up your tab and test it, it your battery still not calibrated you can flash back your backup and repeat calibration procedure.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] AnakTeKa:
question, when step 3, tab position turn on or turn off ?

btw, when i surf with stock browser, my battery drain 1% = 5 minutes

is it normal ?
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
when you charge tab it does not matter if it's on or off... just to avoid shutting it down later leave it off.

measuring discharge rate in 5 min will produce to much of an error. Surf web for 1 hour and then take a look at your numbers...

I would say somewhere in 8-12% would be fine, of cause with brightness set to no more then 20%.

If you read thread I have some information to how diagnose that problem in more scientific way by measuring actual battery capacity.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] choppa26:
vlad_z alright i got my tab in CWM rt now draining bone dry and then imma leave it off for a hour unpluged then charge it for 5 the unplug n leave off for 1 hour then test normal use n monitor batt % i mite also turn it off during use n restart to see if % batt life is thrown off and not the same as i seen someone else in here tried. If no luck will go back into CWM n re do process any thing i missed keep me posted i check this thread every 5min. P.S. read entire thread seems 7510 tab's like mine went at it alil different but i'll try any method at this point ur plan u command.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] zuperpailon:
Has anybody tried the "Battery Calibration app" to fix this problem??

Ive tried the app on my galaxy s2 and works great but im not sure if its compatible with the tab
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
you obviously did not read this thread... this app and other were already discussed
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] choppa26:
Flashed my bone stock rom n now doin the battery fix procedure. Have it in CWM draing rt now.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] AnakTeKa:
i already read thread, but there many troll post

you mean this ?

stock browser with wifi, already try your instruction on page 5

2012/01/18|12:56:02 AM|-674mA|69%|3801mV|32.1ºC|1|0
2012/01/18|12:59:51 AM|-639mA|68%|3778mV|32.2ºC|1|0
2012/01/18|01:04:51 AM|-176mA|68%|3908mV|30.9ºC|2|0
2012/01/18|01:09:51 AM|-325mA|68%|3816mV|31.9ºC|2|0
2012/01/18|01:14:51 AM|-689mA|67%|3752mV|32.5ºC|1|0
2012/01/18|01:19:51 AM|-771mA|66%|3775mV|32.6ºC|2|0
2012/01/18|01:24:51 AM|-772mA|64%|3760mV|33.0ºC|1|0
2012/01/18|01:29:51 AM|-772mA|63%|3748mV|33.3ºC|1|0
2012/01/18|01:34:51 AM|-724mA|62%|3779mV|32.9ºC|1|0
2012/01/18|01:39:51 AM|-736mA|61%|3749mV|32.6ºC|1|0
2012/01/18|01:44:51 AM|-781mA|60%|3744mV|32.9ºC|1|0
2012/01/18|01:49:51 AM|-753mA|59%|3732mV|33.0ºC|1|0
2012/01/18|01:54:51 AM|-666mA|58%|3760mV|32.8ºC|1|0
2012/01/18|01:59:51 AM|-767mA|57%|3679mV|34.0ºC|1|0
2012/01/18|02:04:51 AM|-735mA|56%|3685mV|32.9ºC|1|0
2012/01/18|02:09:51 AM|-721mA|55%|3701mV|32.5ºC|1|0
2012/01/18|02:14:51 AM|-806mA|53%|3678mV|33.0ºC|1|0
2012/01/18|02:19:51 AM|-719mA|52%|3665mV|32.9ºC|1|0
2012/01/18|02:24:51 AM|-648mA|51%|3737mV|32.0ºC|1|0
2012/01/18|02:29:51 AM|-666mA|51%|3655mV|32.8ºC|1|0
2012/01/18|02:34:51 AM|-823mA|49%|3718mV|32.6ºC|1|0
2012/01/18|02:39:51 AM|-759mA|48%|3645mV|33.0ºC|1|0
2012/01/18|02:44:10 AM|-828mA|47%|3650mV|35.8ºC|1|0
2012/01/18|02:49:10 AM|-207mA|47%|3786mV|30.9ºC|2|0
2012/01/18|02:54:10 AM|-606mA|46%|3695mV|32.0ºC|2|0
2012/01/18|02:57:44 AM|-795mA|45%|3677mV|32.6ºC|1|0

when my screen turn off

2012/01/18|01:00:29 PM|-37mA|29%|3756mV|35.6ºC|2|0
2012/01/18|01:05:29 PM|-35mA|29%|3751mV|35.4ºC|0|0
2012/01/18|01:10:29 PM|-34mA|29%|3758mV|35.2ºC|0|0
2012/01/18|01:15:29 PM|-35mA|29%|3751mV|35.2ºC|0|0
2012/01/18|01:20:29 PM|-33mA|29%|3750mV|35.1ºC|0|0
2012/01/18|01:25:29 PM|-37mA|29%|3756mV|35.1ºC|0|0
2012/01/18|01:30:29 PM|-35mA|29%|3750mV|35.1ºC|0|0
2012/01/18|01:35:29 PM|-35mA|29%|3758mV|35.2ºC|0|0
2012/01/18|01:40:29 PM|-35mA|29%|3753mV|35.2ºC|0|0
2012/01/18|01:45:29 PM|-35mA|29%|3747mV|35.3ºC|0|0
2012/01/18|01:50:29 PM|-34mA|29%|3758mV|35.1ºC|0|0
2012/01/18|01:55:29 PM|-35mA|29%|3747mV|35.1ºC|0|0
2012/01/18|02:00:29 PM|-33mA|29%|3757mV|34.9ºC|0|0
2012/01/18|02:05:29 PM|-34mA|29%|3752mV|34.6ºC|0|0
2012/01/18|02:10:29 PM|-36mA|29%|3751mV|34.4ºC|0|0

is it normal ?
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] choppa26:
Update

Ok did full wipe n then flashed bone stock everything back wehich made me loose root odd rt but i was able to use CWM to flash stock. So after that did the battery calibration drain charge process then reflashed root in recovery so far battery seems fine stable again knock on wood will keep all posted.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
@Anakteka

your average current consumption is around 700-750 mA. This is a bit high - means either you running with high brightness or some process is running on background.

but battery calibration seems to be normal - 12% per hour which is fine with that current consumption.

if you set min. brightness - average current should be around 500-550 mA when tab is idle.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
@choppa

glad you have sorted this problem
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] AntonioM:
Hi Vlad_z,

Sorry about the late feedback on my tab problem...

Tried it one more time after you suggestion, but with no sucess. So, i took it to tech support since the tab is still on warranty. After 2 long weeks of waiting I got the tab back again. On the technical intervention report, te guy from support wrote that after a lot of tests the anomaly was not detected and that they just reinstalled everything again. Guess what?? After 1 minute browsing on the internet, the same problem....from 56% to 3% instant drain. Shut down and restart and back again on 56%.

So now, my dilema... Should I try the calibration a couple more times or go back to the technical support and kill someone? :-)

Probablly I did something wrong in the calibration process, but it's not that difficult..;-)

Just one thing... I was charging the tab while on, and it was indicating 71% for a long time. I unplugged it and plugged it back on and the battery indicator was on100%. Strange, no?

Thanks
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
If you have tried calibration but still having instant drop from 56 down to 3 - looks like hardware problem. I would send it back... you don't want a lemon for that amount of money.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] AntonioM:
Just to let my feedback about the battery problem I "was" facing. Tried everything to calibrate the battery, but without success.

So, I opened the tab very carefuly and unplugged the battery for about 30 min to clean the circuit. After that, no more problems. Now, after a week, my tablet is 100% working. No more battery draining.:-)

Probablly this will help other users with the same problems.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] lanwarrior:
I have a couple of questions:

1). Is the above method still valid or do I have to use the CWR method?

2). On the step where I need to run down the battery to 40-50%, do I have to do this within 30-40 minutes? I tried to watch video, full brightness, GPS and Wifi ON, and I can't get it to go from 99% to 50% in just 40 minutes, so I tried to use it for about 1-1.5 hours total.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] Vlad_z:
This method is evolved down the thread... but bottom line, fg chip needs to do two readings when battery was at rest for at least 1 hour. And those readings should be apart at minimum 50% of charge (more is better, just to guaranty that the chip would run recalibration rooting). How you do it - there are many suggestions in the thread...
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] dsafety:
Just out of curiosity, what is the typical battery drain rate when the tab is in sleep mode? I am getting about 5% an hour. This seems high to me.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] sleeplessnights:
I lose around 2% you should check what apps are running, some keep running in the background even when they're shut down.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] lanwarrior:
I did a test for my Galaxy Tab 7+ as follow:

1). Charge overnight to 100%

2). Use an app called "Battery Stats" to monitor usage

3). On the next day, unplug at approx. 7:30 AM. Turn the following on:

- Wifi

- GPS

4). From 7:30 AM to around 8:00 PM, the tab is NOT used, it is on standby

As you can see from the image below (generated by Battery Stats app), the battery drain is VERY small. By 8:00 PM, it's at 89%. You'll also see in the image that screen was OFF from 7:30 AM to 8:00 PM. Additionally, even though the device was "awake" almost constantly (but screen is off) for email checking etc, the battery drain is still small.

The problem comes when I started using the device, as follow:

- Watch movie for 1 hour

- Browse the web

- Check email

- Read eBook

Keep in mind that, beside the movie watching, the rest of activities are occasional (i.e. browse web for 15 minutes, turn it off, do something else, turn on the device again for reading eBook, etc.).

From 8:00 PM to 12:00 AM, with the above usage, the battery was drained from 89% to 15%. That's a drain of 74% in 4 hours!

I did similar test to my iPad 2 and by 12:00 AM, I still have 60% left in my iPad.

This is definitely a problem with the tab circuit/charging/whatever component and not app related.
[Galaxy Tab 10.1 Q&A, Help & Troubleshooting] docfreed:
Plus One - This is from the Galaxy Player 5 forum (more specifically a thread of Entropy512 discussing his kernel here:http://forum.xda developers.com/showthread.php?t=1445840

"The way Samsung estimates state of charge on our devices is extremely primitive and, in general, poor. Instead of a dedicated fuel gauge IC, they have tried to estimate battery directly from voltage with some funky compensation offsets depending on current operating state - the offset for wall charging is so high that it is impossible for the battery to read higher than 80% when on a wall charger unless you're putting the device under heavy load to activate some of the other compensation offsets. Sometimes it seems like the compensation code doesn't "kick in" when plugging in a charger, allowing you to see a higher number, other times it'll get "stuck on" even after removing the charger. The general thing, though, is that any percentage estimates of battery state are WILDLY inaccurate"

Well I have both the Galaxy Player 5 and the Galaxy Tab 8.9 [the latter with Overcome's 2.2 ROM]. Until I applied Entropy512's kernel to the Galaxy Player, I had the same wild charge/discharge behavior as in the posts above - since the kernel was I applied the battery is spot on and discharges ~ 0.5% per hour when sleeping - no mumbo jumbo or mysterious charge /discharge cycles.

Now I'm looking for a kernel for my Tab 8.9 (and I figure it would work for the Tab 10.1 as well) - in the meanwhile I recommend Entropy512's thread - it is highly informative.