yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] Beards:
Mine died whilst using it this evening..... It was on 6% so at that time I didn't think it much an issue.

However, as soon as I connected it to the mains and tried to power it back up it refused to boot up.

So, I left it for a few minutes and tried again.... this time it showed the white charge battery icon so I again left it for 2hrs.

When I came back I powered it up and was surprised to see the battery had only risen to 8%. I left it powered up but in Airplane mode.

I came back 30mins later and it had only risen by a couple of percent.

I then left it a further hour and noticed as soon as I picked it up to to turn on the screen it was stone cold..... Quick feel of the mains charger and that too is cold. Biting the bullet I pressed the power button and swiped the screen....... 14%

No matter when I come back to it it's not rising any further it's stuck at 14%....... any idea's?

Device is stock.
[Nexus 7 Q&A, Help & Troubleshooting] e.mote:
>any idea's?

Strange that no one suggested trying a different charger for this entire thread. Less hassle than shipping the unit back. There's a thread about testing different chargers.

Simpler still, bring N7 into your neighborhood electronics store/dept and try out various 10W USB chargers. Buy if you find one that works.
[Nexus 7 Q&A, Help & Troubleshooting] thebobp:
Died twice at 9% since i overclocked motley kernel. Going to try to duplicate again, I guess.

Edit: died at 3%. Duno.
[Nexus 7 Q&A, Help & Troubleshooting] Caifan09:
Yesterday my battery died at 3%, today it died on me at 15%. I'm charging it now, going to calibrate the battery and see if that helps. Or maybe will try to wipe battery stats from CWM. Using paranoidAndroid with stcok kernel.

Edit: today died at 14% and it would not boot up, so I let it charged for a few minutes and then it booted up just fine and it was at 16% battery and charging. Could it be that it is not reporting the actual percentage of battery life?
[Nexus 7 Q&A, Help & Troubleshooting] najaboy:
I hate seeing people wipe battery stats because those that have advocated it to them are simply ignorant of what it does. Wiping battery stats does not affect battery life or reported battery charge. The only thing that you are wiping is a list of apps that have consumed battery power. Furthermore, Android automatically wipes the file itself when the phone is unplugged after being charged to 100%. Anyone that has told you to do this previously has fed you bad information.
[Nexus 7 Q&A, Help & Troubleshooting] tiongkey:
my nexus 7 kept dying with exactly 23% left in the battery. tried to factory reset it and it still died at 23%. i charged it all the way up to 100%, used a battery calibration app and its going down to 0% again. what do you guys think causes this? and will the problem appear again in the future?
[Nexus 7 Q&A, Help & Troubleshooting] Beards:
Which battery calibration app did you use?
[Nexus 7 Q&A, Help & Troubleshooting] tiongkey:
the name's battery calibration. by nema. its the first one that pops up, sorry i cant post the link
[Nexus 7 Q&A, Help & Troubleshooting] Beards:
Thanks, added a Thank You.

Batteries can and often go out of calibration. Most are corrected as and when you use the device. From my observations the Nexus 7 though does seem to be plagued with this problem more than other devices.

I will try out the calibration app you mention. :)

EDIT: Just notice it requires root permissions...... Blast! Not Rooted and can not at this stage.
[Nexus 7 Q&A, Help & Troubleshooting] NRG-R9T:
I can't help with the problem, but just sharing this general knowledge as my first post:

it's a problem for you, but healthy for the battery, as it's lifetime is expanded slightly by not let it drain completly. Battery between 10%-90% is best
[Nexus 7 Q&A, Help & Troubleshooting] najaboy:
You're equating correlation with causation. It can be said with 100% accuracy that battery "calibration" apps are nothing more than snake oil. It is unequivocally impossible for such apps to affect battery life or battery indication. The short and sweet of it is that they are based on a gross misunderstanding of the operating system and battery stats.

The way such apps operate is by wiping batterystats.bin. This file is merely a list of the apps that have used battery since the last approximately full charge. It contains no information regarding charge level nor does it affect battery life. It also bears mentioning that the file is cleared automatically by Android when the device is unplugged after a near complete charge. The one and only thing accomplished by using a "calibration" app is a waste of storage on your device.

Neithr the battery nor its fuel gauge on your tablet can be calibrated by hokey snake oil. The one and only thing that you,as an end user, can do is periodically, but infrequently, fully discharge it to the point of shutdown.

It also bears a reminder that the myth of battery "calibration" via wiping batterystats.bin bin was clearly and concisely given an official public debunking by Google's Android team.
[Nexus 7 Q&A, Help & Troubleshooting] thebobp:
He's right; the fact is, your charging to 100% was probably all that was required. I just did that while the tab was turned off and it seems to be correctly running down.. for now.

Sent from my Nexus 7 "the most cost-effective iPad yet"
[Nexus 7 Q&A, Help & Troubleshooting] xarrek:
My n7 work fine. But sometimes after reboot I lose about 10-20%.
[Nexus 7 Q&A, Help & Troubleshooting] Shockz:
My n7 is weird. It is staying at full icon when its mot .
[Nexus 7 Q&A, Help & Troubleshooting] theomni:
I'm having the same problem. The battery will go down to 20% and then the device will automatically shut down.

What I've noticed is that if I charge the device to 100%, it will stay there for a long time. I mean, half a days worth of using the device, it will stay there at 100% and then come down. What I'm thinking the problem is that the software is over-estimating the charge, or that the software doesn't kick in until it reaches 80% actual, and then starts counting down from 100%.

Has anyone else noticed this? I started noticing this problem a few weeks ago. It was never like this when I first got the device.
[Nexus 7 Q&A, Help & Troubleshooting] smt8544:
Mine powers off at about 11%. Honestly I cannot be bothered to fix this as it never really goes below 50% because I charge it every day.
[Nexus 7 Q&A, Help & Troubleshooting] Linexus:
Is the problem has been solved yet?

Try to flash Stock ROM and Unrooting it.
[Nexus 7 Q&A, Help & Troubleshooting] dinzkie:
Hey i think ive got a similar problem. I kept on using my phone until 4% and it turned off instantly. Tried charging it for 20 or so minutes and tried turning it on and it was still at 4%. Tried to leave it on while charging but after a few minutes, it starts to fill up the screen display with different different horizontal colored lines and then turns off.

Tried charging it again this time off, it displays the battery icon animation that's being slowly filled up. The only thing ive noticed about this, though, is that it only does this animation 3x and then the LED turns off.

Im kind of scared to restore my device to factory settings for the reason that it's just at 4% and it doesnt seem like ive got an all to similar case with the majority.

This device is unrooted and has never been, BTW.
[Nexus 7 Q&A, Help & Troubleshooting] thebobp:
Again, try turning the device off then charging it to 100%. That caused a recalibration for me and probably one other person here.
[Nexus 7 Q&A, Help & Troubleshooting] dinzkie:
Tried turning it off for an hour before turning it on again and to my happiness, it was already at 23%. Charged it all the way to 100. I'm not going to let this reach 4% again after what happened.

Thanks!
[Nexus 7 Q&A, Help & Troubleshooting] Flyingfin:
Hi, do I have to unload the battery first or doesn't it make any difference?
[Nexus 7 Q&A, Help & Troubleshooting] vibraloop:
I'm not surprised. I have a feeling that something is really messed up with the nexus root.
[Nexus 7 Q&A, Help & Troubleshooting] audiodrive:
same...

My N7 experienced the same problem twice. Died at 20% the other night and 30+% last night while I am playing a game. Hopefully there will be a fix on this problem.
[Nexus 7 Q&A, Help & Troubleshooting] adamantell:
Don't have any problems here

Charge 0-100% can use it even down too 1% each when get down lower then 15% I get a warning mgs

So dunno what's up with all the problems

Sent From Nexus 7 XDA Premium HD App
[Nexus 7 Q&A, Help & Troubleshooting] thebobp:
That's what I did; I don't know if you have to.
[Nexus 7 Q&A, Help & Troubleshooting] Scythe024:
I had mine dying at 50% consistently when I use to be able to run it down to 4%. Factory data reset fixed it, it sucks , but works
[Nexus 7 Q&A, Help & Troubleshooting] TylerDurden1999:
Mine does it at 20%...

Doing a full charge with the screen off.What do you guys recommend?
[Nexus 7 Q&A, Help & Troubleshooting] BrianDigital:
no your right as soon as you charge fully android wipes the battery stats anyways
[Nexus 7 Q&A, Help & Troubleshooting] Caifan09:
Ok I think this could be a solution. Before, my nexus 7 right when it hit 15% it would just power off completely. What I did was removed the back cover and unplugged the battery, then pressed the power button for about 10 seconds so it could discharged completely. After this I plugged the battery and power the thing back on. When I did this I had 49% battery, so once it power back on it showed me 48% but after like 5 minutes it started to show the correct battery percentage, heard the low battery sound and looked at my tablet and it was at 2%. Next I just connected to the charger and let this bad boy fully charge. Now my tablet is showing me the correct battery status I guess because right now I'm at 5% and no shutting down problems like before. Anyone tried this?
[Nexus 7 Q&A, Help & Troubleshooting] rockstang:
I have been having the same problems as everyone else with the battery force rebooting the device. I seemed to be in a loop of rebooting for about 30-40 minutes. It would boot up, work and charge for about 30 seconds and then shutdown. Sometimes static would flash before shutting down. I switched back to stock cable and the loop continued. After about 10 minutes with the new cord I switched to a different outlet. I don't know if this is anecdotal, but switching sockets worked almost immediately. I began to receive a regular charge screen. My original charge location was an old extension/splitter. I switched to an outlet that was not shared with any other devices. Can this possibly affect charging?
[Nexus 7 Q&A, Help & Troubleshooting] lionsh:
Sometimes my N7 connected to an AC charger (original one) detects it as a USB charger...

When I disconnect and reconnect it, it detects it as AC charger.

So i guess you had the same problem with your outlet.

My N7 shuts off at 32% without any notice. It's like 32 is the new 0...

there is an open issue on the matter on google code, perhaps it would be a good idea to comment and star it:

http://code.google.com/p/android/issues/detail?id=41224
[Nexus 7 Q&A, Help & Troubleshooting] dnwright:
If you've flashed a number of ROMs sometimes the battery statistics are inaccurate. May want to try wiping battery statistics.
[Nexus 7 Q&A, Help & Troubleshooting] dinzkie:
I have a similar problem. THe problem with mine, though, is that it never rises. Still at 6%. Is this a charger issue? Here's a video i've recorded. I'm also on stock and using the charger that came with the device.

Also, device was never rooted.

Weird. Can't use the YouTube tags here somehow. So here's the link:

Google Nexus 7 Battery Charging Issue

---------- Post added at 05:17 AM ---------- Previous post was at 04:59 AM ----------

this solved my issue as well. thanks much!
[Nexus 7 Q&A, Help & Troubleshooting] biggiestuff:
Mine was HD widgets. I was getting random reboots and it would shut off at 20%. I thought HD widgets update fixed it, but the minute i tried to uninstall HD widgets it rebooted. Since it's removal it hasn't randomly rebooted and goes down to low percentage before I need to recharge.
[Nexus 7 Q&A, Help & Troubleshooting] alexeiz:
The battery on my nexus 7 was dying at 70%. My first reaction was 'crap!' Then I wanted to see if the calibration tricks help. So I installed the Battery Calibration app. Charged my device for a really long time until I could noticed no more change in battery mV level (my battery got to 4170mV only at 100%, instead of the supposed 4325mV). Then I tapped 'calibrate', unplugged my device and used it (for more than a day!) until the battery was dead again and the device shut itself down. This time it happened at 15%. This is way better than the original 70%, but still not ideal. I couldn't improve it any further. Guess, the battery is a little worn out, and it's the best result you can get with it.
[Nexus 7 Q&A, Help & Troubleshooting] najaboy:
The battery calibration app had nothing to do with it, as that app is 100℅ snake oil. The methodology of this app was clearly and concisely given an official debunking by Google's Android team about a year ago.
[Nexus 7 Q&A, Help & Troubleshooting] psychart:
Mine was dying @ 25-30%, bit after all night charge i notice it stays @ 100% for too long. Normal use for a few days and now its OK, could get to 2%
[Nexus 7 Q&A, Help & Troubleshooting] obi1visionary:
So this incident happened to me as well, I don't know if this thread is dead already but Id like to show how I handled the situation in my end.

If you look at the screenshot you'll see that the device dies at 15% on the left side and then charges from that point as well, my solution is on the right side where I charged the device to 100% then immediately stopped charging and turned it off for approx 4 hrs.

When I turned the device on again, it was at a charge level that is below 100, the correct reading. I should now have the ability to run it down beyond the 15% mark but that remains to be seen.

Hope this helps some people who might be having this issue.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
This has just become a problem for me as well.

For me, it started turning off yesterday at 23%. Holding down the power button for 20 seconds did not work. Adding power to the N7 and doing the power-button-hold method works for me only on the 3rd attempt. It died at 23% again this AM. Same deal with the power-button-hold method only working on the 3rd attempt. I've also noticed that when I charge my N7 up to 100%, it stays right at 100% for a very long time. This leads me to believe that battery calibration is totally wacky.

After doing a bunch of research this AM, there are a handful of potential fixes I plan to try...

- Charge with the original charger up to 100%, and then leave it on charge for a few more hours. Use/discharge the N7 down to 0%. Repeat. This is what I am trying right now and it's reported to be the best way to re-calibrate the power management. As with other N7 owners, it seems to be charging veeeeerrrrryyy slowly right now. I take that as a good thing.

- Do a factory reset.

- Pop the back off, unplug the battery, wait a moment/two, re-seat securely and add a bit of tape to ensure that secure connection. A loose connector seems to be a common issue with N7's. Then, do the method mentioned in the previous point.

- Uninstall HD Widgets. Who knows? It's been reported as a problem. I happen to have this app installed and will try it if previous fixes don't work.

- Return the N7 to Google (rather not do this).

I'll report back.
[Nexus 7 Q&A, Help & Troubleshooting] najaboy:
Bear in mind that this negativity affects the battery.
[Nexus 7 Q&A, Help & Troubleshooting] giobooo:
This works for me:

1. Turn off your device

2. fully charge your tab

3. When it is fully charged turn on the nexus 7

4. Wait 4/5 minutes.

5. Unplug the device from the charger.

With this method my nexus turns off at 1% and it no longer stays forever at 100%.

Inviato dal mio Nexus 7 con Tapatalk 2
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Well, my N7 charged for 7 hours to go from 23% to 100%. It has never taken more than just a few hours to charge up. I let it sit on 100% for a couple of additional hours. Now that it's been unplugged for a couple of hours, it's been on 100%. Not sure things are fixed. I'll let it run down and see where it goes.
[Nexus 7 Q&A, Help & Troubleshooting] giobooo:
Well mine never took that long to charge (with the original charger) so maybe my findings won't be useful to you.

Sorry.
[Nexus 7 Q&A, Help & Troubleshooting] jabsys:
Mines done this a few times, last time it turned off at 45% but the one thing I've noticed is that the battery life hasn't changed, just the battery level shows wrong.

Going to try this & hopefully it sorts the issue.
[Nexus 7 Q&A, Help & Troubleshooting] giobooo:
Let us know if you solve the problem... I just tried on my friend's nexus 7 and this method actually works also on his device.

Inviato dal mio Nexus 7 con Tapatalk 2
[Nexus 7 Q&A, Help & Troubleshooting] x3SNSDx3Tiffany:
mine is also having the same problem and auto off at 30% battery level.

will give this a try.thx
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
I am in the process of troubleshooting this issue. I've researched many threads on different forums that have reported "fixes". Most of these "fixes" are anecdotal and are not likely to work for the majority of us. This issue also appears to possibly be multiple, closely-related but distinct issues:

- N7 turns off randomly

- N7 turns off when the battery is low

- N7 won't turn on

This further complicates the landscape.

Since troubleshooting this issue involves running through full battery cycles, it's not something that can be completed in an hour or two. If I can come up with a reliable/repeatable "fix", or at least, helpful info that I learned along the way, I'll probably start a new thread instead of posting under just one of these issues.
[Nexus 7 Q&A, Help & Troubleshooting] NeoMagus:
If you are comfortable taking the back cover off, unhook the battery from its connector, and plug it back in. Used to have this issue(you can do a search thru this thread or others for my posts), but after reading that suggestion in another thread and unhooking/rehooking, my N7 decharges like it should and doesn't shut off sub 20%. Wouldn't surprise me if a lot of the connectors are just badly seated from poor QC
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Check out this post...

http://xdaforums.com/showthread.php?t=2090826
[Nexus 7 Q&A, Help & Troubleshooting] ynrozturk:
Mine was dying at 40% so that bugged me enough to do a factory reset. Did the reset, unlocked, rooted, and installed Paranoid Android. Installed all my apps and got the thing absolutely rocking, starting reading a book and bam! at 65% this time, the device just shut itself off. I tried a calibration app so we'll see if that works.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Check out my post above yours.

If you are like the majority of folks with this problem, you'll be fixed-up.

Good luck.
[Nexus 7 Q&A, Help & Troubleshooting] ynrozturk:
Thanks, I had read that already. I forgot to mention that I did that battery pull as well.

I guess my best bet now would be to return everything to stock, and start all over again. Hell, 40% was better than 65%..
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
The OP in my thread assumes that you are not rooted and not unlocked. Those are variables beyond the research that I did. So I agree - take it back to bone stock and try my recommendations again. If those don't work, if you wish, you can try some of the "outlier" suggestions that you can find all over the net. Who knows, something might click. If not, go for a replacement. For your money, you deserve a "perfect" N7.
[Nexus 7 Q&A, Help & Troubleshooting] ynrozturk:
Yep, thanks for the advice man. It's just that I'm too lazy to do all that stuff again.. sigh. I guess I will have to. I will post the results once I'm done with it, hopefully I can get it to work like it's supposed to. Thanks for the help.

Edit : I unplugged my drain all the way it could, then unplugged it. Gave it a full charge, and was amazed to see that it went all the way down to 2% before it finally died again. Giving it a fresh, maximum charge now. Hope this fixes the problem.
[Nexus 7 Q&A, Help & Troubleshooting] xateeq:
I have a strange issue (or should i say luck) usually when ever my nexus 7 drops below 30% and i turn screen off and left of for 2-3 hours its battery seams to charge it self 2-5 %. I know this is some messed up battery stats but i never had dead nexus at 30-25-20% battery :D
[Nexus 7 Q&A, Help & Troubleshooting] vihang.idnani:
My battery dies out at 20% precisely and i downloaded a battery level monitor widget and it showed battery capacity at 3260mAh which is completely wrong as all know the battery capacity is above 4000mAh... what should i do?? i cant caliberate as my n7 isn't rooted and i dont wanna pop the battery as it'll void my warrenty... help!! :(

---------- Post added at 09:35 PM ---------- Previous post was at 08:50 PM ----------

additionally, my battery stays "charged" (ie 100%) for far too long than its natural... so any help is appreciated and thanked for... :)
[Nexus 7 Q&A, Help & Troubleshooting] Fotogravin:
Follow directions of post #64 of this thread if battery life hasn't changed but battery level seems to be wrong (stays long at 100%, dies with percentage >10%). That calibrates battery levels. Calibration apps don't do anything useful. No need for battery pulling, unless this doesn't work and problems are caused by loose battery connector

Verstuurd vanaf mijn Xperia Z
[Nexus 7 Q&A, Help & Troubleshooting] clarkeyboy72:
Simple fix worked for me

Ok folks. Second time this has happened to me. Nexus 7 (2013) starts to shut down at xx% (20% for me this time but different from last time). I tried a Factory Data Reset to no avail then finally came across a post that gave me the simple fix of: Switch it off, wait 2 hours, switch it on. Bingo! Battery indicator dropped from 100% (which it had been on for 8 hours to 76% and now discharging normally.

Hope this works for you. Try it before you do an FDR.

Cheers
[Nexus 7 Q&A, Help & Troubleshooting] sietze535:
You should just go to you recovery mode and wipe cache partition if this doesn't work you should use an custom ROM
[Nexus 7 Q&A, Help & Troubleshooting] noise79:
I have no idea why but this method did work! Thank you verynmuchi for sharing this info.. Nkw my nexus 10 runs dkwn to 1% instead of shutting off at 30%.

Brilliant sokution!
[Nexus 7 Q&A, Help & Troubleshooting] 6ix Side:
Mine died at 30%- FIXED!

Hey All,

I recently had the same issue with my S4 and I came across a very cheap but effective fix. There is an app on the play store called "Real Battery" that scales your battery level down to the percentage it dies it. My phone kept dying at 30% so I set the indicator to 30% and it scaled my battery level so that 30% is my new 0%. It lets you know more accurately when your phone is about to die, so that you won't be fooled when your phone says it has charge. Check it out, its called Real Battery.