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For tabs with battery drainage problem... or how to calibrate

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regulator21
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My Samsung tab 2 7.0 brought up an "error with the OS" message after accidentally did a soft shut down. Now the battery is just draining very fast. I had first thought it was because of the new case I got that has magnets in it, but ive learned that the affect is negligable. Will a calibration take care of this issue with draining? any help is appreciated.

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Just for information, calibration didn't work for me so I decided to go hard and open up the housing. It is quite easy, when you have some old plastic credit card (start from the shorter side and continue towards the bottom side with the socket). Disconnected the batter for like 5 minutes and it seems to be working now correctly. For the scarred ones - there is no warranty seal so you won't void it.

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rupene
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Quote:
Originally Posted by Vlad_z View Post
I've got this problem with my tab (quick battery drainage). Symptoms would be your 100% charged tab would go down to 0% in unusual shorter time ( like 2-4 hours). You put it on charger and tab would be charged back to 100% again in substantial short time like 2-3 hours instead of 6-7 hours.

Well, after looking at this issue I think I have come up with solution.
At least, my tab looks like it's back on track... though, to say for sure I would need another couple days of testing.

The problem is not runaway wild application on a background but battery control circuit. This chip reports to OS much smaller battery capacity as it is for some reason. I will not go into details but here is what you need to try:

Flash stock kernel (may be custom kernel is not the reason for bad chip calibration and I'm 90% positive but just to be on safe side). You don't need to do factory wipe in OEM recovery for our purpose.

You also don't need to wipe batterystats.bin or use "Battery Calibration" apps from market (which does exactly the same wipe just in more end user friendly way). This wipe serves no other purpose then refreshing your usage statistics.

You also don't need to drain your battery all way down... nice, this way you don't have to wait for too long.

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.


PS: the reason why this chip calibration went bad at the first still remains open.



EDIT: just want to give a shortcut for those who does not feel like reading through the thread.

http://forum.xda-developers.com/show...1&postcount=41

Edit: here is calibration procedure which was modified down this thread ...

1. in CWM/recovery 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.

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

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

4. disconnected charger and let it sit for 1 hour.

5. boot up your tab and test it, it your battery still not calibrated you can flash back your backup and repeat calibration procedure.

Edit: if you physically disconnect battery (you have to disassemble tablet) and keep it for couple min. that would trigger FG chip to start with default SOC curve.
Awesome - had updated to ics and battery was draining overnight. tab now working fine. This post needs to be a sticky.
 
nexus_g
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(Last edited by nexus_g; 20th March 2013 at 10:24 AM.)
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Default Re: For tabs with battery drainage problem... or how to calibrate

Hi guys,
I install A1 kernel on my cm10 and got batt bug. So I flashed back the original kernel and followed the instruction on page one and get rid of the bug. My tab is back to normal again. Question still remain, if i could still use A1 kernel, will it give me the batt problem again? In other words, can we still use the kernel that give the batt problem after caliberation?

Thanks Vlad_z for his contribution on this problem.

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Serpentene
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Default Re: For tabs with battery drainage problem... or how to calibrate

It's a panacea effect.. Deleting the .stat file does nothing useful for battery drain.
Allow the battery to fully discharge and auto shutdown. Recharge 50%. Deplete to warning.
Fully recharge 100%. Stat file will gauge appropriately by third round recharge.

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melvine08
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Mine also, charging is also very slow.
 
HD-McSlacker
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This worked for me. It actually even worked just by shutting down my tablet for an hour or so, and then charging it overnight. It went from going dead in less than an hour, to now having run for the past 24 hours on a single change. And I haven't even done the second shut down as you've recommended. Thanks!
 
Lucas Kado
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Simple. How many things have been said about how to correct this issue?
 
drD16
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Thumbs up my galaxy tab3

I followed all the steps, and quite idiotically my battery indicator fell from 97 to 48percent in 2mins! I have switched off the tab and chk out tomorrow.... at first I thought there is problem with battery, but thn I found tht my tab lasted for about 4hours of heavy usage with just 1percent battery signal(ofcurs that's terrible as the brightness falls to zero) hope ur tech works for me! thanks in advance
 
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(Last edited by TTboy404; 14th January 2014 at 02:00 PM.) Reason: Update based on events
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Quote:
Originally Posted by drD16 View Post
I followed all the steps, and quite idiotically my battery indicator fell from 97 to 48percent in 2mins! I have switched off the tab and chk out tomorrow.... at first I thought there is problem with battery, but thn I found tht my tab lasted for about 4hours of heavy usage with just 1percent battery signal(ofcurs that's terrible as the brightness falls to zero) hope ur tech works for me! thanks in advance
Mine had become nonfunctional due to power issues like this. it got to where it run for maybe a hour or two, sometimes even less. Last week, it would run for like 20 minutes and shut off.
Last time i sent it in to samsung, 70.00 repair charge, and it did the same thing over time.
I got disgusted in July, and was going to buy a LTE ATIV Q, which never showed.
Then Note 10.1 2014 LTE in October, which has really never showed up either.

On whim, i got disgusted, and just restored back to factory. Orignial factory last week.
While upgrading via OTA, charge on battery went from like 10% to 75% after an OTA update. I had put that Team Battery bar on it, so it was obvious what just happened. Almost in front of my eyes, i was driving, and it rebooted between exits. Yes, i know i should not hack and drive...lol

That isn't battery. Thats battery meter or software or something. Physical battery, must be fine.

Restored to Stock Verizon Out of the box, Honeycomb a second time yesterday, and it ran 13 hrs on battery in standby today alone. Battery itself almost has to be fine.
I will read this thread again.

thanks!




I will update.
The official OTA updates is respnosible for the battery issue.
I restored again back to factory Honeycomb, because I have nothing on the tab.
This last time, After the first update, and one of the next OTA updates did the exact opposite as last time. My battery went to 70 to 2, then proceeded to die.
Instead of assuming I was out of charge. I turned tablet off, and let it set for an hour, no charger.
Reboot, back up to 70%
I cracked the case this time. Its easy, take care around the ear phone jack.
The battery has a simple connector right in the center, you just pop up. I let ithe tablet sit for about 20 minutes to make sure there was no residual charge in circuit

Been averaging standby for 16 or more hours. Yesterday it kinda unepectedly quit, but I had been on LTE for over 5-6 hours, tablet had been running on battery for a couple hours before.

Might look for a new ROM, if all I have to do, is crack the case, and reset the battery.
T Mobile Note 3

Previous Devices, all moded....
ATT SGS3
Verizon Galaxy Tab LTE 10.1
ATT SGS2
T Mobile HTC HD2
HTC Polaris
HTC Blue Angel (WinCE oh yeah!)

Verizon

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