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Rebooted and battery went from 45% to 10% WTF

Anyone ever heard of this? What the hell is that about?
Thanks

Happened to me all the time.
Sent from my GT-N7000

Has happened to me many times on both phones. I'm guessing battery calibration goes bad and when reboot it tries to adjust. Also note that when this happens, battery will slowly recover as if the phone is charging. Say it dropped to 10%, leave the phone aside after the reboot, battery will increase to somewhere around 20%. I've had this problem on the stock ROMs of both Note and the SGS II. Hope this helps.
--
Sent via XDA Premium from SGS II

Try calibrate your battery by letting it blackout then take out your battery for two minutes then put it back again, dont reboot yet, let it charge to full, then go directly to CWMR and wipe battery stat and reboot.
Sent from my GT-N7000 using xda premium

same here, happened to me a few times.
Does battery calib really work or its all a myth??

I don't know to consider this a bug, or what.
But.. battery calibration won't help. I've tried.
On my device, it happened :
*) when my device got very hot (when use certain kernel), I reboot, then voila.... the battery drop around 20-30%.
At first I said WTF... then I faster charge (because at that time, after drop, my battery left only 1%)
The next time happened, I was on the road, and can't charge my handphone. So I just leave it there, laid in my bag.
Surprisingly, after some times, the battery start to increase again, though it's not coming back to the same percentage as before it drop.
So is it a bug ? Perhaps... but only happened when your device got very hot.
And when your device is very hot (under certain kernel), and you never reboot / switch off first, you will see that the battery flow like water.
But when you switch off, let it cool, then boot up again, the battery will stagnant at the same percentage when you switch off. Go up and go down at the same percentage for minutes to 1 hour+.
So you want to consider this is a bug ? perhaps, but.... not everytime happen. So long as you are on the correct kernel that suit your device.
:victory:

Huge drain may affect the stats.
The percentage is calculated based on the voltage of the battery. On heavy drain the voltage may drop unpredictably (for the ROM). Also, the temperature will affect the voltage (thus percentage).
With my phone if happened only once, the night after update to LRQ so I assume this is connected to battery stats.
But also, certain ROMs can affect this behavior.

[Q] Xperia TX Battery Problem - Using 2 Original Battery

Hi guys, I just want to share with you a problem I encountered using 2 original Sony Battery BA900. I have 2 batteries, both original. Both of them fully charged, 1 battery inserted into my phone and 1 as back-up. After my battery discharged up to 10, 20 or 30%, I will try to change to my back up battery. After changing it, the phone dispalys the same battery charge level with my first one, for example before I removed the first battery, the charge level is 10%, changing into a new one that is fully charged to 100%,it will also show 10%. The battery will continue to drain up to 1% and will stay there for several hours. So that means, the battery is really fully charged but the battery icon shows a wrong level.
However using another local battery (not original from Sony), I will not encounter this problem, meaning after the original battery drained up to 10%, I will change to a locally made battery that is fully charged, it will show 100% on the battery level.
Note that any ROM that I use, Stock or Custom ROMS available for TX, I will encounter the same problem using 2 original batteries.
Is there anybody who encountered the same problem with me? Any suggestions to fix this?
Thanks

I see someone have same issue like this.they call it normal
the way to solve that when you change new battery you have to wait 20-30 sec then put the new battery on.

paullu said:
I see someone have same issue like this.they call it normal
the way to solve that when you change new battery you have to wait 20-30 sec then put the new battery on.
Click to expand...
Click to collapse
I tried to do it, but still I'm observing the same problem. I even waited for few minutes before I put the new battery inside my phone. The only way it can show the normal readings of the battery level is when I charge it for a few minutes, if the battery level of the previous battery on my phone is 10%, changing it to a fully charged new battery the phone will also show 10%, after charging it for a few minutes, it will suddenly jump to 100%.
I hope Sony can come up with the fix with this because the unbranded batteries can work really well.
Thanks.

I have the same problem with Mugen Power Battery. I think that the battery meter is not working fine and I hope that Sony can fix it.

my xperia x10 had the same problem a couple of times the battery off instead of a hard way of inserting normal if you want to try

matti342001 said:
my xperia x10 had the same problem a couple of times the battery off instead of a hard way of inserting normal if you want to try
Click to expand...
Click to collapse
What do you mean? Can you explain it further? Thanks.

[Q] Large Battery Loss Overnight

Hi,
With all applications closed, data/wifi/gps/sync all turned off and no screen usage my phone went from 100% to 19% overnight (roughly 8 hours). I did this as a test after my phone would randomly throughout the day drop by large percentages.
Prior to running testing the battery overnight I put it to charge, and I found that it charged from ~20% to 100% in only an hour, which I believe is abnormally fast.
I am on the stock ROM with the stock kernel and no other applications installed.
What might be the cause of this?
Could this be a software issue (ie: software stopping the charge early or the displayed battery percentage being off)? Or is this likely to be the hardware?
Thank you for your help!

Try completely draining the battery then charging it with no powering on ( just plug it in then dont touch it) for 5+ hours
Sent from my LG-P880 using xda app-developers app

rudders93 said:
Hi,
With all applications closed, data/wifi/gps/sync all turned off and no screen usage my phone went from 100% to 19% overnight (roughly 8 hours). I did this as a test after my phone would randomly throughout the day drop by large percentages.
Prior to running testing the battery overnight I put it to charge, and I found that it charged from ~20% to 100% in only an hour, which I believe is abnormally fast.
I am on the stock ROM with the stock kernel and no other applications installed.
What might be the cause of this?
Could this be a software issue (ie: software stopping the charge early or the displayed battery percentage being off)? Or is this likely to be the hardware?
Thank you for your help!
Click to expand...
Click to collapse
many causes are possible, however most obvious one is rampant wakelock called baseband_xmm. no definite solution, although custom kernels have dealt somewhat with it.

rudders93 said:
Hi,
Could this be a software issue (ie: software stopping the charge early or the displayed battery percentage being off)? Or is this likely to be the hardware?
Thank you for your help!
Click to expand...
Click to collapse
I have stock ROM (JB India version). I noticed similar trend a few days ago. I had done factory reset and subsequent to that, battery loss overnight is less than 1%.
You could try the same.

rudders93 said:
Hi,
With all applications closed, data/wifi/gps/sync all turned off and no screen usage my phone went from 100% to 19% overnight (roughly 8 hours). I did this as a test after my phone would randomly throughout the day drop by large percentages.
Prior to running testing the battery overnight I put it to charge, and I found that it charged from ~20% to 100% in only an hour, which I believe is abnormally fast.
I am on the stock ROM with the stock kernel and no other applications installed.
What might be the cause of this?
Could this be a software issue (ie: software stopping the charge early or the displayed battery percentage being off)? Or is this likely to be the hardware?
Thank you for your help!
Click to expand...
Click to collapse
i have a similar problem :/

@rudders93 @zri best you can do now is to install betterbatterystats. it will tell if anything is keeping your phone cpu on.

Thanks so much for the replies!
As suggested, I found that completely draining the battery and then charging the phone while it's off resolved the issue

[Q] Battery problem, drops to 0% randomly

I'm aware that this problem has happened to others, and I have seen solutions for this problem, but every fix I've come across works temporarily...and by that I mean a day or two.
While using my Atrix HD, when the battery reaches between 20-35%, the battery will suddenly drop to 0% and shut down. This usually occurs when I am using an app, such as MixZing or the camera app. Any attempts to turn the phone back on cause it to shut off again as soon as the boot animation finishes. The only way to keep it on is to plug it into a charger, and when it does boot, the battery shows the same percentage it had when the phone conked out on me. I've even tried calibrating the battery using NèMa's Battery Calibration app, and the problem still occurs...mainly because I can't get the battery to drain completely so I can properly calibrate the battery.
Long story short, I need a fix, or at least a suggestion as to how I can keep this problem at bay. Does anyone have information regarding this problem?

did you ever wipe the battery data when you flashing a new rom ?
I think you need to re-reconigz the battery .

lounew said:
did you ever wipe the battery data when you flashing a new rom ?
I think you need to re-reconigz the battery .
Click to expand...
Click to collapse
Agree. In cwm there is an option to wipe battery stats.
I had a similar problem with my HTC First where at 25 % it would go straight to 10 an then to 0 in like 30 seconds...although that was on stock rom...

Do you have the m40 battery mod from maxx?

Just curious
TecknoFreak said:
Do you have the m40 battery mod from maxx?
Click to expand...
Click to collapse
Just curious (I am new here, hi :3)
What is the m40 battery mod?

Sorry i ment eb40
http://forum.xda-developers.com/showthread.php?t=1906371

TecknoFreak said:
Sorry i ment eb40
http://forum.xda-developers.com/showthread.php?t=1906371
Click to expand...
Click to collapse
I don't use the eb40 mod, it's all stock hardware. Haven't tried wiping the battery stats, though; can't believe I overlooked that. I'll give it a shot and see if it does the trick.
EDIT: CWM doesn't seem to have an option for wiping battery stats for this phone; I've tried three versions and none of them give me that option.

MysticRhythms87 said:
I don't use the eb40 mod, it's all stock hardware. Haven't tried wiping the battery stats, though; can't believe I overlooked that. I'll give it a shot and see if it does the trick.
EDIT: CWM doesn't seem to have an option for wiping battery stats for this phone; I've tried three versions and none of them give me that option.
Click to expand...
Click to collapse
I suggest you first write down the current battery volume , for example , now in the system ,you can see 60% battery left .
then you shut down the phone , connect your changer , the phone will change and the battery volume show . if this volume is not equal to the No. you see in the system , it means that your system have a wrong battery data record .

lounew said:
I suggest you first write down the current battery volume , for example , now in the system ,you can see 60% battery left .
then you shut down the phone , connect your changer , the phone will change and the battery volume show . if this volume is not equal to the No. you see in the system , it means that your system have a wrong battery data record .
Click to expand...
Click to collapse
Shut down my phone, battery was at 91% (had charged it overnight). Plugged it in and the charging screen showed 90%. Is that what you were talking about, with the two battery volumes not being the same?

I think it's fixed!
I did a full system reset (including formatting the system, which I apparently had yet to do throughout all this time) to install a new ROM. Today the battery drained all the way down to 2% while I was browsing the web (something that normally would shut off the phone at around 30%) before shutting off. It seems that by skipping that crucial step, the system could not properly read/calibrate the battery when installing a new ROM, which may have caused this problem.
I think it's safe to say it's fixed. For now, at least, but I'm remaining optimistic. Thanks to everyone who pitched in with an idea or just said a few words; great to know people care around here.

MysticRhythms87 said:
I did a full system reset (including formatting the system, which I apparently had yet to do throughout all this time) to install a new ROM. Today the battery drained all the way down to 2% while I was browsing the web (something that normally would shut off the phone at around 30%) before shutting off. It seems that by skipping that crucial step, the system could not properly read/calibrate the battery when installing a new ROM, which may have caused this problem.
I think it's safe to say it's fixed. For now, at least, but I'm remaining optimistic. Thanks to everyone who pitched in with an idea or just said a few words; great to know people care around here.
Click to expand...
Click to collapse
I'm glad that you fixed it. I did the same but I still have that problem. When It's 20% it drops to 15% and then to 5% in 30 seconds.

Arjomer said:
I'm glad that you fixed it. I did the same but I still have that problem. When It's 20% it drops to 15% and then to 5% in 30 seconds.
Click to expand...
Click to collapse
Thankfully, I haven't had it drop that low that fast. Of course, this IS the Atrix HD, which carries such a weak battery compared to other phones in its class. Nevertheless, I feel great knowing that my phone doesn't shut off so unexpectedly. If it happens again, I'll do my best to deal with it, but for now...it's just success.

I had this problem after i force rebooted my phone, it got stuck at 1% when charging for almost 15mins. I had to turn the phone off.

MysticRhythms87 said:
Shut down my phone, battery was at 91% (had charged it overnight). Plugged it in and the charging screen showed 90%. Is that what you were talking about, with the two battery volumes not being the same?
Click to expand...
Click to collapse
for my understanding ,before you shut down the phont , you saw the batter volumes in system is 91% , and then you shut down the phont ,plug it in , and see the battery volume is 90% .I think in this situlation , the battery record in your system is correct ,cause 90% and 91% almost the same . I think your battery is dying , you should replace your battery

lounew said:
for my understanding ,before you shut down the phont , you saw the batter volumes in system is 91% , and then you shut down the phont ,plug it in , and see the battery volume is 90% .I think in this situlation , the battery record in your system is correct ,cause 90% and 91% almost the same . I think your battery is dying , you should replace your battery
Click to expand...
Click to collapse
Well, a couple weeks later and I'm still not having the problem. The battery does still drain relatively fast (I go from 100% at about 9:00 A.M. to 35% at 3:00 P.M, with minimal usage such as checking Facebook/Twitter and stuff like that), but that's mostly due to the small battery capacity. The battery health is still good according to the scans and hardware checks I've done. I may, however, look into trying the EB40 mod if it means the battery will last much longer.

MysticRhythms87 said:
Well, a couple weeks later and I'm still not having the problem. The battery does still drain relatively fast (I go from 100% at about 9:00 A.M. to 35% at 3:00 P.M, with minimal usage such as checking Facebook/Twitter and stuff like that), but that's mostly due to the small battery capacity. The battery health is still good according to the scans and hardware checks I've done. I may, however, look into trying the EB40 mod if it means the battery will last much longer.
Click to expand...
Click to collapse
did you ever try to flash a new rom , you can try , if the problem still there , there is no doubt that the battery is bad .

Strange battery behavior, so i'm searching for a kernel

Here's my problem:
My battery level suddently drop from 50% or 30% to 0% in few seconds.
When i'm in system on (for example) 90% battery, if i go in recovery my battery level is 5%.
I tried a battery calibration program with no results.
My last chanche is to try another kernel but, i can't find one!
I'm searching for a stock kernel with root and recovery for 5.0.1.
Now i'm on rockz1 kernel.
Someone know where to find a stock kernel that i can try without losing root?
Or maybe there is already a solution to this strange battery problem?
Sorry for this noob request.

sar3vok said:
Here's my problem:
My battery level suddently drop from 50% or 30% to 0% in few seconds.
When i'm in system on (for example) 90% battery, if i go in recovery my battery level is 5%.
I tried a battery calibration program with no results.
My last chanche is to try another kernel but, i can't find one!
I'm searching for a stock kernel with root and recovery for 5.0.1.
Now i'm on rockz1 kernel.
Someone know where to find a stock kernel that i can try without losing root?
Or maybe there is already a solution to this strange battery problem?
Sorry for this noob request.
Click to expand...
Click to collapse
There is nothing strange about this problem. You have classic symptoms of a dying battery. No kernel, rom, battery calibration or any other solution will help. Replace the battery and your problem will go away...
The reason your battery goes down suddenly is that it can't hold power due to deterioration of cells. In other words, only 5-10% can hold. Think of it as an air baloon: your baloon can hold 10% of air it used to hold and it will still rightfully show 100%, but once you start using it, the air goes fast and once it is close to empty, the system shuts down the phone. I bet it does not also take long to charge for the same reason.
If you don't believe me, do a test: start a youtube video when your battery is at 50%: I bet your phone wouldn't last more than 15 minutes.

optimumpro said:
There is nothing strange about this problem. You have classic symptoms of a dying battery. No kernel, rom, battery calibration or any other solution will help. Replace the battery and your problem will go away...
The reason your battery goes down suddenly is that it can't hold power due to deterioration of cells. In other words, only 5-10% can hold. Think of it as an air baloon: your baloon can hold 10% of air it used to hold and it will still rightfully show 100%, but once you start using it, the air goes fast and once it is close to empty, the system shuts down the phone. I bet it does not also take long to charge for the same reason.
If you don't believe me, do a test: start a youtube video when your battery is at 50%: I bet your phone wouldn't last more than 15 minutes.
Click to expand...
Click to collapse
i believe you.
it is time to try to change battery but if something goes wrong...
...i'm coming Z5!!!