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[RESOLVED] Phone dead due to overheating?

Hello everyone. I have a Galaxy SL running stock Gingerbread (2.3.6). It's not even rooted.
A few hours ago, I was playing Angry Birds. Battery level was around 80%. Then I switched to another game (SliceIt, to be precise). At this point, I noticed that the backside was unusually warm. I checked battery temperature via Elixir 2 - 45C. Usually it would be around 37C. I thought it was probably due to the game. And the day was hot too. But after a few minutes, the game just hung. Home button, lock button - all unresponsive. Then I pulled out the battery and reinserted it, but now it won't even turn on. I've tried charging it again, but no luck. Please help!

Strange never heard of this problem before
so is your phone is not turning on

Try to go to download Mode by pressing volume down+home button+power button

A Friend of me had a similar Problem, we took out the battery for about ten minutes. After that it booted again.
Sent from my GT-I9003 using XDA App

slaid480 said:
Try to go to download Mode by pressing volume down+home button+power button
Click to expand...
Click to collapse
The thing won't respond! I think it committed suicide
Taraen said:
A Friend of me had a similar Problem, we took out the battery for about ten minutes. After that it booted again.
Click to expand...
Click to collapse
Tried that, nopa!
tarunagg said:
Strange never heard of this problem before
so is your phone is not turning on
Click to expand...
Click to collapse
Yes, it won't turn on even to save its life.

Nah, mine went to 60 degree celcius, while on Skype videocall with OC to 1300MHz. Then i kept on charging and aftr a min or two, it said, charging stopped due to extremely low or high battery temp.
Later, i removed battery, and later, turned on after like 15min, smooth and normal as ever.
So your problem definitely isn't because of overheating.

ggclanlord said:
Nah, mine went to 60 degree celcius, while on Skype videocall with OC to 1300MHz. Then i kept on charging and aftr a min or two, it said, charging stopped due to extremely low or high battery temp.
Later, i removed battery, and later, turned on after like 15min, smooth and normal as ever.
So your problem definitely isn't because of overheating.
Click to expand...
Click to collapse
Then what could permanently brick a phone like this? Hardware failure? But then this would be the first time. I've given the phone once to service center for a camera-related problem already, but I haven't experienced any hangups, or sudden reboots. Then again, maybe that's because I haven't even rooted it yet...

ggclanlord said:
Nah, mine went to 60 degree celcius, while on Skype videocall with OC to 1300MHz. Then i kept on charging and aftr a min or two, it said, charging stopped due to extremely low or high battery temp.
Later, i removed battery, and later, turned on after like 15min, smooth and normal as ever.
So your problem definitely isn't because of overheating.
Click to expand...
Click to collapse
I didn't know our phone had a safety cutoff
what we do know is that not all phones are the same. if kbar's phone's safety cutoff wasn't working or something, or something else wasn't made 100% as designed, it's possible that the soldering on a circuit melted and he lost the electrical connection needed to run his phone. happened to my laptop before. I know a laptop doesn't have a cutoff (in most cases), but you get the point. even if the electronics are rated higher, the solder may melt sooner.
@ kbar, it's best to take it in for service if it won't go to download mode.

Case closed
Thank you all for your help. Got it back from service center. The guy was vague. "Board problem" or something. Makes me agree with what supergaijin said: probably a faulty chip. Anyway working fine now...

kbar1 said:
Thank you all for your help. Got it back from service center. The guy was vague. "Board problem" or something. Makes me agree with what supergaijin said: probably a faulty chip. Anyway working fine now...
Click to expand...
Click to collapse
Thread closed, problem resolved.

Hard Bricked...

Last ditch effort for a solution here.
I have a 16gb white that's been performing just fine... i did unlock the bootloader and root, but had no issues. That was several days ago. Today, I installed a flashlight app from the play store. (Droidlight LED Flashlight by Motorola). Once I ran the app, the camera LED came on for about 2 seconds, and then both the LED and the screen went dark. The battery was at about 80% when this happened.
The device is now completely non-responsive. Holding down the power button and any combination of keys does nothing, and there is no charging indicator when it's plugged in. I've never bricked a device before, surprised this seems to be caused by a play store app (although if it's truly bricked, I suspect some sort of power issue).
Thanks for any advice anyone can provide before I have to RMA this thing. Any Ideas?

Can you get into the bootloader? Hold Vol down + power
---------- Post added at 02:17 PM ---------- Previous post was at 02:16 PM ----------
Nothing works? You might be the second brick of the day

You could try to remove the battery, maybe that'll help.
edit: ofc try RMA first.

kylgore said:
Last ditch effort for a solution here.
I have a 16gb white that's been performing just fine... i did unlock the bootloader and root, but had no issues. That was several days ago. Today, I installed a flashlight app from the play store. (Droidlight LED Flashlight by Motorola). Once I ran the app, the camera LED came on for about 2 seconds, and then both the LED and the screen went dark. The battery was at about 80% when this happened.
The device is now completely non-responsive. Holding down the power button and any combination of keys does nothing, and there is no charging indicator when it's plugged in. I've never bricked a device before, surprised this seems to be caused by a play store app (although if it's truly bricked, I suspect some sort of power issue).
Thanks for any advice anyone can provide before I have to RMA this thing. Any Ideas?
Click to expand...
Click to collapse
Hook it to a charger for some time and then try to get in fastboot mode once in a while, then go to recovery and delete the cache and do a data factory reset and reboot. That is what i would do at least.

jd1639 said:
Can you get into the bootloader? Hold Vol down + power
---------- Post added at 02:17 PM ---------- Previous post was at 02:16 PM ----------
Nothing works? You might be the second brick of the day
Click to expand...
Click to collapse
Can't get into the bootloader. I've tried the following combination of keys...
Vol+ and Power - nothing
Vol- and Power - nothing
Vol+, Vol- and Power - nothing
Power on it's own for 2+ minutes - nothing
---------
Contacted Google and they're getting me an RMA... regardless, I'd be careful about running that particular app, or possibly any flashlight app.

jd1639 said:
Can you get into the bootloader? Hold Vol down + power
---------- Post added at 02:17 PM ---------- Previous post was at 02:16 PM ----------
Nothing works? You might be the second brick of the day
Click to expand...
Click to collapse
What do you mean with second brick, does this happen, if you install a Custom ROM?

maumaumau said:
What do you mean with second brick, does this happen, if you install a Custom ROM?
Click to expand...
Click to collapse
I think he means someone else started a thread as well indicating that they also had a bricked phone. I read that thread before I created this one, as mine wasn't related to fastboot or recovery. My brick occured from actions that occured during runtime, and root wasn't even acquired by the app that caused the failure.

maumaumau said:
What do you mean with second brick, does this happen, if you install a Custom ROM?
Click to expand...
Click to collapse
No it doesn't happen unless you don't do your homework and screw something up. If you read and learn it's very hard to hardbrick your phone. But this is the second one I've seen today. In both cases there are unique reasons it happened.

jd1639 said:
No it doesn't happen unless you don't do your homework and screw something up. If you read and learn it's very hard to hardbrick your phone. But this is the second one I've seen today. In both cases there are unique reasons it happened.
Click to expand...
Click to collapse
I flash my Phone with custom ROMs since the beginning of the Nexus era. To root and to flash my Nexus one took me like 2 hours to complete it (I admit, that I received some help back then).
For me it doesn't look here like it happened because of anyone's fault. The phone is available since this week and he's already rooted. He doesn't look like someone, who is new to it.

drain and recharge
if you have a secondary phone use it for a few days and leave your Nex5 to drain. Should be completely drained in 2-3 days. Then charge it up and try to enter bootloader.
PS: you could also try to open the phone and manually disconnect and reconnect the battery...

agent47er said:
if you have a secondary phone use it for a few days and leave your Nex5 to drain. Should be completely drained in 2-3 days. Then charge it up and try to enter bootloader.
PS: you could also try to open the phone and manually disconnect and reconnect the battery...
Click to expand...
Click to collapse
I'm going to let the battery drain, but there's literally no power running through the phone right now, it's doing nothing. Something was fried, I'm afraid it will take a lot longer than 2-3 days for the battery to naturally drain.
I'd love to pop the back off and unplug the battery (that was my first thought) but I'm not doing anything to risk getting the phone replaced. I'll RMA it.

kylgore said:
I'm going to let the battery drain, but there's literally no power running through the phone right now, it's doing nothing. Something was fried, I'm afraid it will take a lot longer than 2-3 days for the battery to naturally drain.
I'd love to pop the back off and unplug the battery (that was my first thought) but I'm not doing anything to risk getting the phone replaced. I'll RMA it.
Click to expand...
Click to collapse
Just rma it. It's the best you can do at this point

Replacement phone leaves the warehouse in 3-4 weeks. arggh.

kylgore said:
Replacement phone leaves the warehouse in 3-4 weeks. arggh.
Click to expand...
Click to collapse
Scratch that, for those interested, my replacement phone is already in hand. Google moved pretty fast on this one.

[Q] Randomly Powering itself off? Battery issue?

So I've had my 16gb Tablet for a few days. Upon first power up, I ran through all the updates, including 5.0. When all the updates were done, I did a complete reset of the system to get Lollipop nice and fresh.
I've noticed that a few days ago, I left the tablet on my nightstand at about 50%, the next afternoon it was completely dead. I didn't think much of it, thinking maybe a program went crazy and sucked it dry. It happens.
Yesterday I left it on my bed at 64%, a few hours later I went to use it and it was powered off. At least I thought it was powered off. I'm noticing this unit might have bad buttons, as they are really squishy and don't have a lot of feedback for the up volume and power. So after pressing the crap out of the power button, it seemed to power back up. It greeted me to showing about 60% battery. Ok, that was weird, but not the end of the world. I plug it in to charge to 1005%.
Last night, I unplugged it at 100% and left it on my computer desk. Just now (next morning) I went to flip open the cover and it wouldn't turn on. I try hitting power and nothing. I hold the power down for about 20 seconds and it finally powers on. It boots up to 48% battery. Now keep in mind that I didn't do anything to it last night when I unplugged it. As a matter of fact, I didn't open apps, but I made sure I swiped all open cards away so nothing was running.
Sorry for the long post, but I want all the details here.
A couple questions:
Anyone else having random sleep issues where it won't wake up? I thought a lot was resolved going to lollipop?
Anyone have issues with soft sloppy buttons with no travel or click on the side? This is my second unit and I thought the first one had better buttons..

I'm having the same issue. Once it goes to sleep, sometimes it randomly just shuts down on its own. When I leave it on overnight, it's almost guaranteed to be off in the morning. Since I've come to work today, it's already automatically shut down twice. What the heck is going on?

cflow said:
I'm having the same issue. Once it goes to sleep, sometimes it randomly just shuts down on its own. When I leave it on overnight, it's almost guaranteed to be off in the morning. Since I've come to work today, it's already automatically shut down twice. What the heck is going on?
Click to expand...
Click to collapse
Are you sure that the auto shutdown feature is disabled?
Sent from my SHIELD Tablet using XDA Free mobile app

Stresa said:
Are you sure that the auto shutdown feature is disabled?
Sent from my SHIELD Tablet using XDA Free mobile app
Click to expand...
Click to collapse
It was the first thing I checked, and yes, it's disabled. I did a reset of my device yesterday and I've only had one random shutdown thus far. Not ideal, but still an improvement....

You need RMA, Please read this : http://forum.xda-developers.com/showthread.php?p=56907689
Same story for me, tablet was defective, battery drain even in airplane mode with no application installed. If your tablet do this, don't lose time and change it.

I've just purchased one and it's happening exactly the same, it happens constantly, also the battery drain is considerable.
I'm in Lollipop, and I've already done a coupe of factory reset.
Does anyone know if this can be repaired somehow? Or I'll have to return it...
Thanks!

R-M-A.

Judge584 said:
R-M-A.
Click to expand...
Click to collapse
Never requested a RMA to NVIDIA, are they fast? I've bought the tablet in Amazon, I have doubts yo who should I request it.
Thanks

So you should request amazon, unless Nvidia offer you a direct replacement in their forums.

Quick question. Does everyone here experiencing shutdowns have a case with an auto wake/sleep feature?

I too have this issue. Auto off is disabled.
I tried going back to gingerbread and the power issue is non-existent. Once I do all the updates to Lollipop the issue returns. Think it's an issue with the rom, since gingerbread works flawlessly.

I have both a skin and one with auto wake and my k1 has been shutting down on its own even with just tye skin on it.

Battery issue (battery indication level stuck at 20%)

After a shut down due to low battery, I powered up my Xperia Z5 while charging it and the battery has been stuck at 20% every since. I tried doing a factory reset and also letting the battery discharge until it power offs and charge until the battery seems full (roughly 2 hours for quick charge), but the battery level is still stuck at 20% not even budging at all. I removed the battery icon from the status bar and re-added it but it still remains as 20% (when I press battery usage I would only see a horizontal line at the 20% mark). My phone is not rooted, what should I do that might work..? I purchased my phone from Taiwan and I'm currently in the states so requesting for an RMA would be a pain.:crying::crying:

Press volume up or down(can't remember which one) together with the power button till the phone give 3 vibration.
Or repair your phone with pc companion,backup your data first.

gm007 said:
Press volume up or down(can't remember which one) together with the power button till the phone give 3 vibration.
Or repair your phone with pc companion,backup your data first.
Click to expand...
Click to collapse
I think it's volume up! I already tried repairing my phone and also hard reseting the phone (pressing volume up with the power button till phone vibrates 3 times.. ):

So is it fixed after the repair?

gm007 said:
So is it fixed after the repair?
Click to expand...
Click to collapse
No, it's not

Try to charge your phone while power off.
Sent from my E6653 using Tapatalk

gm007 said:
Try to charge your phone while power off.
Sent from my E6653 using Tapatalk
Click to expand...
Click to collapse
I tried depleting my battery completely twice and charged the phone while it was off for a few hours (making sure that's its getting a full charge) and both times when I turn on the phone it still remains at 20%

Think you have bad battery and need replacement. Hope I'm wrong.
You can try to go into service menu there is something about charging try it.
It is Factory charging.
*#*#7378423#*#*
Sent from my E6653 using Tapatalk

gm007 said:
Think you have bad battery and need replacement. Hope I'm wrong.
You can try to go into service menu there is something about charging try it.
It is Factory charging.
*#*#7378423#*#*
Sent from my E6653 using Tapatalk
Click to expand...
Click to collapse
Okay, I'll try it whenever I get back to my phone! I might have to send this phone back to Taiwan just for a replacement/repair though since it's not even out in the US yet.. Tried calling Sony Mobile yesterday and they said they can't do anything about it..

HI. i'm having the same problem and searching for the answer. hope you'll update battery issue. tnx.

Try to do simulated battery pull.. Turn off your phone then press volume - and power button and count to 20 then release and start up your phone.

Same problem here
gm007 said:
Press volume up or down(can't remember which one) together with the power button till the phone give 3 vibration.
Or repair your phone with pc companion,backup your data first.
Click to expand...
Click to collapse
I'm having the same problem with my Sony Xperia Z5. Just bought it May this year. It just happened Tuesday this week. I charged it but it went only to 20%. Tried charging it the next morning but it's still the same. I am now doing what you advice to vfyk. Hope it will fix my problem tonight. I'll get back to you after charging it for 1 hour and see what will happen.
Thanks gm007!
---------- Post added at 03:31 PM ---------- Previous post was at 02:48 PM ----------
sonyxperiaz5_TR said:
I'm having the same problem with my Sony Xperia Z5. Just bought it May this year. It just happened Tuesday this week. I charged it but it went only to 20%. Tried charging it the next morning but it's still the same. I am now doing what you advice to vfyk. Hope it will fix my problem tonight. I'll get back to you after charging it for 1 hour and see what will happen.
Thanks gm007!
Click to expand...
Click to collapse
Aw... Done with the instructions unfortunately, no progress made. Maybe I'll try the *#*#7378423#*#* you suggested. I saw some menu in their. Customization Settings-Reset Customization. I'll try resetting it. Maybe it'll work.

Hard reset didn't solve the problem
Hey guys. Just an update. I already tried hard reset for my sony xperia z5 but it didn't solve the issue. This is my first sony phone and I'm having a bad experience. Anyone can help me there? Thanks!

Did you ever solve this? Having the same problem with a Z5 compact.

svejav said:
Did you ever solve this? Having the same problem with a Z5 compact.
Click to expand...
Click to collapse
If Phone is rooted, try battery calibration app or wipe battery stats in recovery if available.

Case solved!
sonyxperiaz5_TR said:
I'm having the same problem with my Sony Xperia Z5. Just bought it May this year. It just happened Tuesday this week. I charged it but it went only to 20%. Tried charging it the next morning but it's still the same. I am now doing what you advice to vfyk. Hope it will fix my problem tonight. I'll get back to you after charging it for 1 hour and see what will happen.
Thanks gm007!
---------- Post added at 03:31 PM ---------- Previous post was at 02:48 PM ----------
Aw... Done with the instructions unfortunately, no progress made. Maybe I'll try the *#*#7378423#*#* you suggested. I saw some menu in their. Customization Settings-Reset Customization. I'll try resetting it. Maybe it'll work.
Click to expand...
Click to collapse
I read some instructions regarding this last year and it helped. I forgot where did I search it. Just open the port where sim card and sd card is, then press the yellow tiny button inside simultaneously with the power button until it vibrates for sometime until it ends. It didn't work for just one time, you'll have to do it over and over again until its fixed. The next day, I tried it again and voilà! Battery level tells the truth again! I'll try to find who gave this instruction for you to have the full details, and also to thank him.

You have to delete "/data/system/batterystats.bin" file, WHEN your charge 100%.
Shutdown your phone charge until 100%, then follow one way..
Two possible way to delete this file.
1-)Rooted Device (with file manager like Root Explorer)
2-)Flashing stock FTF with select all WIPE options on Flashtool.

Case solved! Full instructions...
sonyxperiaz5_TR said:
I read some instructions regarding this last year and it helped. I forgot where did I search it. Just open the port where sim card and sd card is, then press the yellow tiny button inside simultaneously with the power button until it vibrates for sometime until it ends. It didn't work for just one time, you'll have to do it over and over again until its fixed. The next day, I tried it again and voilà! Battery level tells the truth again! I'll try to find who gave this instruction for you to have the full details, and also to thank him.
Click to expand...
Click to collapse
Okay, here it is, the full instruction.
*It will take several attempts but be patient. Hold down the red/yellow button (whatever the color is, I can't see it clearly with my xperia z5 because I previously used a ball pen with it and it tainted mine) inside the sd slot and hold down the power button at the same time. When it hits the last vibration (1 buzz then some buzzes=1) do this until it vibrate three times then plug the charger. Leave it within 5 mins, and if it has not done anything different, repeat.
I got this instruction (*with some minor edits) directly from a member in another site (talk.sonymobile.com). The name is "metalfacemegan". Well, there you go! Goodluck!
---------- Post added at 05:13 PM ---------- Previous post was at 05:07 PM ----------
svejav said:
Did you ever solve this? Having the same problem with a Z5 compact.
Click to expand...
Click to collapse
Just made some recent posts. Try following the instructions and hope you get the same result. Follow the thread. Thanks!

This tiny yellow button help to reset phone, if it freeze and won't shutdown because of the static electric. I never used but it may format all data on your phone? sonyxperiaz5_TR, you used that before. It was delete data or not?

The button
sceryavuz said:
This tiny yellow button help to reset phone, if it freeze and won't shutdown because of the static electric. I never used but it may format all data on your phone? sonyxperiaz5_TR, you used that before. It was delete data or not?
Click to expand...
Click to collapse
It didn't reset mine and yes I used that before, like several times when I was fixing the battery issue. As far as I know, all the data of my phone were not deleted including the internal storage. All is good for me.
---------- Post added at 03:18 PM ---------- Previous post was at 02:56 PM ----------
sonyxperiaz5_TR said:
It didn't reset mine and yes I used that before, like several times when I was fixing the battery issue. As far as I know, all the data of my phone were not deleted including the internal storage. All is good for me.
Click to expand...
Click to collapse
Maybe you should back up first your data on the internal memory just to be sure. When I did it to mine, all apps, messages, logs, calls, and etc. were fine.

Phone shutting down at random %ages (50, 60, 40+)

Hi All,
I'm facing a weird issue with my phone from more than 2 months and it has reached a frustrated level now. It used to shut off at levels like 15%, sometimes between 15-25%. But nowadays, it shuts down automatically at 40-60% and that is really unreliable. So, i wanted to check if there are other people facing the same issue or is it only my device. Please share your views, any possible solutions, possible reasons, and if applicable, similar experiences.

thanks for the info, i got my oneplus one back in 2013, hopefully it will not shutdown after a while. i have not found such problem and hope i will not in the future as i want to have the phone for at least 5 years

karthics4 said:
thanks for the info, i got my oneplus one back in 2013, hopefully it will not shutdown after a while. i have not found such problem and hope i will not in the future as i want to have the phone for at least 5 years
Click to expand...
Click to collapse
Well i do hope you won't face any issues with your phone. But this is totally weird. This is making my phone unreliable for me.
Sent from OnePlus One

abhibnl said:
Hi All,
I'm facing a weird issue with my phone from more than 2 months and it has reached a frustrated level now. It used to shut off at levels like 15%, sometimes between 15-25%. But nowadays, it shuts down automatically at 40-60% and that is really unreliable. So, i wanted to check if there are other people facing the same issue or is it only my device. Please share your views, any possible solutions, possible reasons, and if applicable, similar experiences.
Click to expand...
Click to collapse
Clear all data from recovery and reflash system with fastboot images. http://forum.xda-developers.com/oneplus-one/general/guide-return-opo-to-100-stock-t2826541

kushal.purkar said:
Clear all data from recovery and reflash system with fastboot images. http://forum.xda-developers.com/oneplus-one/general/guide-return-opo-to-100-stock-t2826541
Click to expand...
Click to collapse
If you won't mind asking, how actually will that help with this issue? I'm just curious to know

abhibnl said:
If you won't mind asking, how actually will that help with this issue? I'm just curious to know
Click to expand...
Click to collapse
I had the same issue after I updated to MM and recently after latest update also. I had to do the same thing. Reason behind that was xposed was incompatible. But as I flashed everything. (/system/data too ) now its working fine

kushal.purkar said:
I had the same issue after I updated to MM and recently after latest update also. I had to do the same thing. Reason behind that was xposed was incompatible. But as I flashed everything. (/system/data too ) now its working fine
Click to expand...
Click to collapse
Thanks for the details. Unfortunately, i would need some time to perform this as i barely get time to flash roms. Thanks again!
Sent from OnePlus One

Dude... just get a new battery...

Traace said:
Dude... just get a new battery...
Click to expand...
Click to collapse
Just the answer i was looking for [emoji106] [emoji106]
Sent from OnePlus One

abhibnl said:
Well i do hope you won't face any issues with your phone. But this is totally weird. This is making my phone unreliable for me.
Sent from OnePlus One
Click to expand...
Click to collapse
thanks so much, bought it after my nexus4 died which im still sad about because its one of my 1st real android phones after having a contract android phone.

As an update, i kept my phone on charge for straight 4-5 hours. and now it shuts down after 20-25%. Definitely an improvement. But still it's a mystery why does it show this bug in the first place.

Umm, how has no one mentioned maybe trying battery calibration!? Seems like a fairly obvious first step here to take before swapping out for a new battery.. Plug the phone in and let it charge entirely. Even at 100% in Settings > Battery it will still show "100% - Charging on AC" (or USB whatever you've got connected)
You need to wait for that to turn into "100% - Charged." Then, calibrate using any battery calibration app from the playstore, ( I use this one )
After it charges to 100% - Charged, hit "calibrate" in the app, disconnect the charger, and let it drain entirely. You might find it dying out before 0% once again, but this hopefully should have been the last time. Plug the phone in and switch it on as soon as you can while it starts to charge. Let it charge uninterruptedly to 100% - Charged, again.
Not saying this might solve it 100% but it is an option to try.

GuitarGuy96 said:
Umm, how has no one mentioned maybe trying battery calibration!?[emoji14]Seems like a fairly obvious first step here to take before swapping out for a new battery.. Plug the phone in and let it charge entirely. Even at 100% in Settings > Battery it will still show "100% - Charging on AC" (or USB whatever you've got connected)
You need to wait for that to turn into "100% - Charged." Then, calibrate using any battery calibration app from the playstore, ( I use this one )
After it charges to 100% - Charged, hit "calibrate" in the app, disconnect the charger, and let it drain entirely. You might find it dying out before 0% once again, but this hopefully should have been the last time. Plug the phone in and switch it on as soon as you can while it starts to charge. Let it charge uninterruptedly to 100% - Charged, again.
Not saying this might solve it 100% but it is an option to try.
Click to expand...
Click to collapse
Well already tried and i may sound a bit silly, but studies have proved that battery calibration is a myth. Android automatically cleans the batterystats.bin file after every single full charge. Rest assured, i have already done that with no avail.
Sent from OnePlus One

I had the same problem, phone was switching off @ 40% and at times @35%. Battery calibration certainly helped. No more problems now. Works well if the phone is rooted.