yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab General] wildcat777:
Henrylam if you do decide to go ahead and try what Shinji did can you keep us posted on if there's any improvement to the battery problems. . OK its worked for Shinji will be interesting to see if it works for you,hope it does:)
[Galaxy Tab General] henrylam:
Hi, I have taken out and put back the battery :). I am going to do a full charge and keep you guys updated.
[Galaxy Tab General] henrylam:
Updates.

I was doing charging with Tab switched on. Charging was smooth. No more stopping at 65% or 70%. I unplugged once it reached 100%.

As mentioned, my past experience was when I unplugged charger, battery indicator sometimes fell to 30% or it will auto shut down. So far, no encounter of such situation.

I will monitor the discharging upon usage and also monitor the battery indicator voltage versus %. Last time, it used to be out of syn. Finally, I will do a few cycle of charging & discharging to verify the condition (probably 1 week).

Regarding the tools, I spent $6 to purchase the tri type screwdriver (in a set with other heads), I used some hard plastic material to prick open the top portion of the tab. Lets hope everything works.
[Galaxy Tab General] henrylam:
Updates: 27 Mar 2011

SGT was discharging (with games, watching YouTube) well, no more sudden prompt of asking me to shut down becoz it has 3% battery left, in actual fact it is 30% left. Total standby plus heavy usage is about 17 hrs. With battery 19% left, I do a recharge.

Second charging of SGT, smooth charge to 99% (4078mV). And no false or erractic indication shown on the battery wideget (curvefish).
[Galaxy Tab General] wildcat777:
So what you thinking Henrylam? Do you think this could be the way to solve this problem? Gotta say i'm not looking forward to opening up my tab and removing battery. There's no way i wanna do that until i'm sure its worth while. How long are you gonna give it Henry until you think its definatley worked?.
[Galaxy Tab General] shinji21:
Its been a while for me and the battery is performing great. If you have those problems, i think its worth to give it a try.
[Galaxy Tab General] henrylam:
So far so good, even for warranty claim, I dont think Samsung will ever notice. Simply becoz no void stick can be found.

It's up to you on whether you wanna give it a try.
[Galaxy Tab General] henrylam:
Updates: 30 March 2010

I have charged my Tab for the third times, it seems the battery life can last longer (or maybe just my imagination), probably I left it on for another 1 hr after it reaches 100%.

No sudden drop of battery encountered, and charging is smooth up to 100%, although 99% to 100% still takes abit of time.

So, any of you guys that have encountered charging issues, battery draining issues, etc., do try out this method (removing battery and putting it back) if you can't stand it anymore.............. like me :)
[Galaxy Tab General] jeromejeremytay:
well actually i have a bad feeling that battery widgets are the major problems, especially those with percentages output for users. cause in other forum, one of the expert says that trying to get the battery information continuously might be the cause of such battery issue. Come to think of it, why the galaxy tab is not pre-installed with percentage battery indicator? and by pressing *#0228#, it reads the battery info. There was one time that it shows my battery with a temperature of 53.0degrees Celsius, which is a nonsense to me.
[Galaxy Tab General] henrylam:
Hi Jeremy, I personally tried 3 different types of battery widgets, and I have encountered the same old problems previously. Now, even if I used whatever battery widegets, it will give me an accurate readings. The key thing is what the SGT reads, it is not about the widget.

Somehow, there is some problem with the readings of the battery, inside the case, it has 5 wires connected to the battery, and such mis-readings can be caused by the battery information feedback to or from the processor. If I can figure out which wires that supplies voltage (or current) to the SGT, I can do a external switch to trigger it, in case the problem comes back. But so far so good.

Frankly, I have read from so many experts, but nothing helps, except I didn't do an "upgrade" to my ROM. So, I rather fiddle with it. And with this experience, I should be able to do a simple trouble shoot (for hardware) in case anything fail. A note to take, just becareful when you are opening the cover near the mic, make sure not to "dig" too deep.
[Galaxy Tab General] audin:
I have the same issue with mine, I have installed Battery Monitor Widget wich shows me a usage curve, and it shows that from 40% it goes staight down! My wifi, gps, mobile date are always off if i dont use it and i always use the RAM manager Level 2 when I'm done using my tab. and still it drops from 40-0 in 1hour or less every time..
[Galaxy Tab General] henrylam:
Yes, this is what frustrates me. The sudden drop of battery life and the charging issues make me crazy, so that's why I have resorted to this http://www.youtube.com/watch?v=urGUKerJOhg , I just remove the connector to the battery and after 10 mins, put it back right in. It is risky, but I am happy. Shinji and myself have tried it and it works great now.
[Galaxy Tab General] wildcat777:
Hi henry and shinji,glad to hear its still working,think i will hang fire for the moment as my problem seemed less extreme than yours,my problem was just the fact that when my tab had charged on some occasions when i unplugged the charger it would instantaneously drop to 89% so id have to plug it back in for 15 minutes and it would stay at 99%. Luckily i haven't experienced any of the sudden drops in charge like from 40% to 3% super fast. The only time it happens is when i reach 10% then it will drop to 3% within seconds,to be honest though i can live with that taking into account that when you hit 10% the screen becomes just to dim to become legible anyway. Nice to know though that if the sudden drop in charge problem arose there's a real possible fix for it.
[Galaxy Tab General] parasupaman:
After trying many ROM upgrades/reflashes, fully draining and charging etc. all to no avail, I finally found this thread and have been following this thread for awhile.

I received the tools today and just opened and disconnected the battery. It was a bit of a hassle trying to pry the thing apart, so I left the battery disconnected for a good 30 minutes, just to make sure. I did not want to have to open my Tab again anytime soon.

Nothing else has worked for me, so I have high hopes that this is the solution. But yeah, I'll let you know how I go.
[Galaxy Tab General] henrylam:
I am confident it will work for you and you will enjoy the fun of owning a SGT again :)
[Galaxy Tab General] henrylam:
Hi Wildcat, those "moments" doesn't happen to me in one shot, it just comes and goes, I can't tell you the sequence, sometimes, the charging is good, sometimes, it goes wrong, same as discharging. I just felt that it is not worth the time to monitor the battery status all the while, rather than optimising its feature.

If you can accomodate the SGT battery issues, I supposed it is fine.
[Galaxy Tab General] henrylam:
Any updates?
[Galaxy Tab General] parasupaman:
So far so good. After a few days of usage, it appears like the battery life and meter have returned to normal. Battery life is now as good as new.

I'm so relieved to have found a fix. An unreliable battery would have killed an otherwise great Tab experience. So it is good to know that I can just perform the battery disconnection procedure whenever I experience battery problems in the future.

Thanks very much for posting the solution and your experiences. Don't know how widespread this problem is, but it is probably something that every Galaxy Tab owner should know.
[Galaxy Tab General] henrylam:
Thanks for the feedback. I am very much happy that you have solved the problem by this method. This proves that the disconnection of the battery works 100%, so far :).
[Galaxy Tab General] black_math:
How does reconnecting the battery solve the problem exactly?
[Galaxy Tab General] henrylam:
By somehow, it reset the battery status of the SGT. Some of the guys has tried rooting and deleting the status bin, but it didn't work. This reconnecting procedure works so far. Remember, there are 5 wires connected to the battery, it should include status feedback, temperature sensor, battery monitor, etc.

Mine is still working extremely fine after doing the reconnecting battery procedures.
[Galaxy Tab General] howtodoo?:
I have this same issue. Anyone who hasnt pryed their tab open yet and dissconected the battery can give this a try. Im running a cdma gt, with the v5 kernal and ive been using boush's kernal from the get. I charge my tab while its on and get great battery life. I found that when i charge the tab while its off that i get the quick battery drain. Guys try this out let me know if it helps.
[Galaxy Tab General] MartinMu:
Hi

I am getting the same or similar issue on my SGT.

PDA:JJ7

PHONE:JK5

CSC:JK2(AUT)

What happens is that at roughly 65% battery drops to 3% and then the tab shuts down automatically.

What I noticed and maybe someone might want to verify this, it happens mostly when the screen is on at full brightness.

Could this be a hidden temperature shut down instead of a low battery shut down.

Maybe it simply gets too hot and Samsung by faking voltage level issues a shutdown of the OS. Maybe the only way to do it. ;)

Cheers

Martin
[Galaxy Tab General] DarkPal:
Try a barttery calibration app. Full charge the battery and click on battery calibration button.

Also http://xdaforums.com/showthread.php?t=1021910&highlight=battery
[Galaxy Tab General] henrylam:
Hi Martin, when you increase the brightness of the screen, it draws more power, it will shut down faster (at 65%). But if you power off and power up again, it will probably be around 64 or 63%. This is the problem. The CPU is not reading the right battery status on the battery, thereby giving a shutdown warning. For a normal operation, this should not happen.

I used to have this problem, this is so unpredictable that I have no confidence in using it when battery indicator shows 50%. Coz, you might not know if it will shutdown anytime. A good condition SGT should be able to let you drain out the battery flat (or at least do a recharge at 5% left).
[Galaxy Tab General] MartinMu:
Another strange thing I noticed and it might be a reason to power off earlier.

When plugged into a USB port, the SGT says, that it is not charging, however, and thats the interesting part, the battery indicator shows percentage going up till 100%. According to the specs, USB charging is not possible as it does not provide enough current (5V 2A).

So assuming that the charging is not really being performed, the battery indicator would be completely consufed and as such, not showing the correct charge information. Due to this SGT will turn off, sometimes at 65%, some times at 30%.

I have done several tests now and there is no real clue on what happens. From what I can see, the SGT battery temp goes up from idel 28°C when running browser and full brightness up to 55°C.

Cheers

Martin
[Galaxy Tab General] wildcat777:
Hmm the battery temperature going up to 55c seems excessive,the most my battery temp goes to is around 35c and that's with constant use for hours and brightness at full.
[Galaxy Tab General] henrylam:
Same, the max I will get for temp is 35 deg C. In idle mode, it is 27 deg C.

Martin, I think you are having the same issue with my tab previously. Once you have tried the tricks suggested by the guys here (e.g. calibration, flashing Rom, etc.) and it didn't work. I would advise you to pry open and disconnected the battery. I am sure it will solve your charging/discharging and temp problems.
[Galaxy Tab General] kaipro:
I faced exact same battery issues in this thread from the time i purchased my tab last year. From rapid drain to auto close and even overheat >50°c, now i just decided to do as suggested by remove batt. You guess what, everything solved like magic. I used it whole day yesterday without any charge, remaining 64% which never be before, and also today.

I will Recommend you who have this same problems to do so..

I love my tab a lot more than before..
[Galaxy Tab General] henrylam:
Congrats, I am happy you have made the decision. Only the brave one will dare to give it a try. However, the return is priceless :)
[Galaxy Tab General] texasreb:
What I am trying is to reboot the tab when it starts to freak out with the battery counter. What you do is power down the tab and then power it up with the power button and volume up key at the same time. You then reboot the tab. Seems to work so far as I will continue to experiment.
[Galaxy Tab General] greenbridge:
I confirm it works!!! It fixed my battery issue. I no longer need to physically open the SGT.
[Galaxy Tab General] greenbridge:
I had the battery problem which caused SGT auto shut down every 15 minutes due to fake battery status.
[Galaxy Tab General] henrylam:
Do you do it everytime the battery shut down warning comes on? Or you just do it one time and it solves the problem forever? That means, no more battery problem? Can you verify that it will not come on again for say, a week?

Thanks.
[Galaxy Tab General] texasreb:
It has worked for me for over a week now. It seems to be when I change out a micro sd card that the tab freaks out. I have my movies on a separate card.
[Galaxy Tab General] wildcat777:
If this is true then its great news,I don't fancy having to open up my tab if this problem ever occurs so to have an alternative fix is reasurring.
[Galaxy Tab General] henrylam:


If it does not occur anymore, then it is good fix. But if it comes back and forth, then it is not solving the root cause. I hope other can give it a try too :)
[Galaxy Tab General] henrylam:


Hi wildcat, can you give it a try and share your feedback? Thanks.
[Galaxy Tab General] greenbridge:
did it one time and the issue is gone. so far so good for almost 48 hours with no charge. will monitor and report later.
[Galaxy Tab General] wildcat777:
Hi Henry I've not had the problem of sudden drops in battery status likes you(30% to 3% or 60% to 3% etc etc)thankfully,my problem was just when charging it would give 100% message only for it to drop to 89% when i unplugged charger,so i would just plug it back in for 15 minutes and it would give the 100% message but this time only drop to 99% when i unplugged the charger,so my problem wasn't as extreme as yours. But rest assured if the problem of massive drops in battery status ever starts occurring i will try this new method out and keep you informed,by the way I've been letting my battery run down to 1% lately and then turning it of,i then charge it(whilst of). Well im keeping my fingers crossed because since I've been doing it this way my tab battery status as become more stable. It always without fail has taken exactly 31/2 hours to charge, there's no more 6 hour or 8 hour charges till the 100% message appears and now when the 100% message appears i unplug the charger and switch on the tab,now this is about the 30th time I've charged using the 1% left method and its always charged it to 99%,no more 89%..bye for now.
[Galaxy Tab General] henrylam:
Good for you if it works. However, monitoring the battery stats to wait till if left 1% is sort of stressful to me. If I own this tab, it should give me a piece of mind (that's why I decide to pry open it once and for all :p).

At this moment, I charged it like 3 to 4 days, battery life left about 20% to 30%, then I will recharge it again. So far after the disconnection procedure, I do not encounter past problem anymore :). But if there is a simpler way to solve the charging/discharging problem, I will recommend to all. The joy of owning the SGT is to use it with ease/convenience and not trouble by the battery issues.
[Galaxy Tab General] Climbingwez:
Hey Henri,

I'm suffering the exact same battery issues with my SGT, even after running custom kernal and ROM.

Wondering if you would mind lending me your tools and a half hour of your time to help me pull apart my SGT in exchange for a beer of Starbucks?
[Galaxy Tab General] wildcat777:
Have you tried what texasreb did,checkout page 7 of this thread,greenbridge confirmed it worked for him to,you might as well give it a go before you open up your tab.
[Galaxy Tab General] Climbingwez:
I haven't tried yet, as I only flashed the Overcome ROM and kernal last night. I suffered the same battery dead problem within 5 minutes of starting up the device, but since then after a full charge last night, the battery dead from 40ish% problem has not occurred.

Ill give it a couple of days before opening it up, and will keep informed.
[Galaxy Tab General] Rambler76:
Im also having the issue of the battery dropping from 30% to 2%.

Is it as simple as booting into recovery mode and then rebooting the galaxy tab from the menu to solve this battery issue ?
[Galaxy Tab General] henrylam:
First thing first, where are you from? I am in Asia :). If you are in other parts of the world, my air ticket is probably costlier than the tools........
[Galaxy Tab General] henrylam:
Previously, I used to try the rebooting method, however, it didn't work for me. But some of the guys have successful stories. So, you would need to try it first before knowing if it works for your SGT. Good luck.
[Galaxy Tab General] zaoltryence:
I confirm openning the tab does solve battery issues, i decided to open my tab a week ago because i started to have this issue
[Galaxy Tab General] lucid1018:
I have tried the tip of starting the tablet while pressing the volume increase button and that seems to have worked fine. 20 hrs since last charge and battery is around 67%.
[Galaxy Tab General] henrylam:
That is good, but do let us know the condition again after a few charges.
[Galaxy Tab General] henrylam:
Good for you to try prying open the tab, it ain't that difficult, was it? :)

You can rest assure, the problem will not return again, for me, it works perfectly.
[Galaxy Tab General] k0sh:
http://xdaforums.com/showthread.php?t=1067014 here is the solution guys :)
[Galaxy Tab General] henrylam:
This maybe for custom ROM only.
[Galaxy Tab General] marcowang:
I tried this method, "power it up with the power button and volume up key at the same time", but it will go into recovery mode. Do you means to select reboot in recovery mode? Is it correct? Thanks for your help!
[Galaxy Tab General] Rambler76:
Im still having issues and have had the 50% to 3% drop today while watching videos.

Ive tried booting into recovery mode and rebooting from there when it happened but it still brought me back to a 3% battery status.

Is it worthwhile sending my tab in for service to get the battery replaced ?
[Galaxy Tab General] vince_junior:
Is the battery covered by the warranty?
[Galaxy Tab General] henrylam:
I think it should be under 1 year warranty. So long if you can show them (right in front) the issue, they have no reason to reject the warranty.

However, it maybe a challenge to simulate the fault by yourself or by the Samsung customer support during that time.
[Galaxy Tab General] wildcat777:
Hi Henry, when you removed your battery was it charged,partially charged or totally discharged. Also once you'd taken out battery and then replaced it what did you do next? Charge it immediately whilst of then turn it on? Or did you just turn it on? One last question Henry,when you removed the battery how long did you leave it till you put it back in? Thanks.
[Galaxy Tab General] henrylam:
Hi Wildcat, when I took out the battery, it was partial charge. After prying out the cover and disconnecting the cables, I leave it disconnected for 10 mins. After that, I just put it all back and let it continue to discharge while using it normally. Do take note that after putting in the battery, do remember to set the correct calendar date and time, if not, all your email and calendar will be out of sync.

Good luck and enjoy your SGT after that :).
[Galaxy Tab General] johndwstark:
Okay, this drove me mad as I could have 70% on the battery and it would suddenly go to 3%. I'd power it straight back up and it would be at 60ish %.

No matter what ROM I tried, out was the same.

I installed Overcome's Gingerbread ROM 2 days ago and the problem hasn't returned - managed to get battery into the 20's and it didn't suddenly go to 3%.

I'll post again if it returns though
[Galaxy Tab General] black_math:
The problem has also completely disappeared for me on JQ1.
[Galaxy Tab General] henrylam:
Hi, what's the different between JQ1 and Overcome's Gingerbread ROM 2 (as what John did)? Are they the same? Sorry for asking such blunt question :D .
[Galaxy Tab General] Climbingwez:
Hey Henry,

Going back to my offer of coffee in exchange for your expertise and tools, i live in Punggol and work on Orchard Rd. :)

Let me know if you are free for an hour sometime. In the meantime, im gonna try the new Overcome ROM mentioned above.
[Galaxy Tab General] henrylam:
Ok, I received your message. I hope the Overcome ROM works for you. If not, you can try opening up by yourself :). I am actually stationed in Vietnam for my work. The key tool that is required is the tri-type screwdriver. You can easily find this from some of the $2 dolloar shop (not everything is $2, if you know what I mean). I saw them selling like $7 per pack. Very handy. It is used for opening 2 screws near the charging connector. You will need to lift up the sticky black tape on the screw head (round tape) to expose the screw (tri-type, mercedes without the rign). As for the prying tool, you can invent by yourself. Simply use one end of the toothbrush (you can easily find those in the hotel or worn-out tooth brush) and break the end, then just smoothen it with sand paper or simply on concrete floor. The main thing is to get a pry open the screen without damaging the casing. I used a plastic 2pin plug adapter for that, it is hard and easily available. For prying open, just follow the Youtube video and do it slowly at the beginning. Don't worry about the LCD, it is tough. Just take care not to leave any scratch on the side of the casing. It's easy.
[Galaxy Tab General] zoftdev:
Still waiting for solution with out remove battery.
[Galaxy Tab General] henrylam:
I agreed with you. I would suggest you try installing the Overcome ROM first instead of waiting for others to confirm. I noticed that some works and some doesn't. Good luck.
[Galaxy Tab General] johndwstark:
OK, had overcome 2.0.0 b2 for over a week now and can safely say that its no longer an issue. I only need to charge once our twice a day and that's with constant data use, including streaming

Regarding the difference between this and JQ1, short answer is I don't know what JQ1 is :s bit of a noob so sorry about that
[Galaxy Tab General] zoftdev:
sorry, but my fake battery come when i flash overcome 1.6.4
[Galaxy Tab General] johndwstark:
You should try installing the 2.0.0 RC1 ROM. It's a Gingerbread ROM which makes me think the problem was with something in the Froyo code.

Makes sure you read all the instructions first and backup your data from your INTERNAL SD card as by flashing this, you WILL 100% GUARANTEED NO QUESTIONS ASKED lose all the data from there.
[Galaxy Tab General] Climbingwez:
I can confirm that after flashing the latest Overcome GB v.2.x.x ROM my battery woes have been solved.

And they were huge battery woes.
[Galaxy Tab General] jpanggy:
For those whom are not upgrading to Overcome 2.0 yet. I can confirm that unplugging the battery works. Worked for the 2 tabs that I have.

I'm in Australia, the tri wing can be bought with the multi precision tools from bunnings or other retailers.

The two plastic covers, well you can use a small screwdriver or whatever that can pry it open.

To open the tab cover I used Guitar picks, choose the medium thickness (too thin it will bend, too thick it won't even fit the gaps between the case and screen).