yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] dalanik:
And it did! I had like 50-60% of the battery, left N7 off for like 2 hrs and upon turning on and booting, surprise, surprise :) My battery was at 12%.... :) Strange...
[Nexus 7 Q&A, Help & Troubleshooting] d4nteps:
big problem here too, nexus wont turn on...

i downloaded with the franco kernel app the v65 and was going too flash this kernel from the app. went into trwp, flashed...reboot...then bootloop...i had 6 % battery left so i thought..leave it and check later...my nexus turned off, perfect but now, if i plug in the charger...nothing happens....press power putton button- nothing!

tried some combinations with vol +/-

plugged in the charger for + 1 hour...

pressed the power button over a minute

removed battery and replugged it..

still nothing..any other possibilities?

do i have to go for an rma? bootloader is unlocked, i'm sure this will be a problem

thanks

edit: its back..atleast for a second...plugged the usb cable in my laptop, pressed power and it startet but stucked at android is upgrading/updating..rebooted itself and now i have some flickering...like someone said before..wth
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Great to hear.

BTW, the battery status is not really strange - it's actually a symptom of the issue. I detail that aspect in the sticky.

Enjoy your N7!
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
These are all typical symptoms as defined in the sticky I referenced above. But, additional variables for you are being rooted, having a custom kernel and possibly a custom ROM. Still, I'd suggest reading the stick all the way through, and trying every "fix" listed in that post prior to doing an RMA. Alternatively, you could also go back to stock prior to doing all the fixes.

Good luck.
[Nexus 7 Q&A, Help & Troubleshooting] surferdude73:
Thanks for responding. I was on vacation and had to put this on hold for the week of the fourth and I'm just now getting back to my N7 issues.

I am unable to perform a factory reset as the N7 won't boot.

I am currently following your instructions as of Wednesday night. The N7 has had the battery pulled since Wednesday night around 9 EST, which is roughly 36 hrs ago.

I am now plugging in back in but not turning it on. I will wait a few hours and then connect the official charger, plugged into a wall.

Tell me if you have any suggestions, otherwise I'll report back after lunch.

Thanks,

Jay
[Nexus 7 Q&A, Help & Troubleshooting] BobbaLouie:
As an anecdotal comment, I have had my N7 only for a few weeks and had been tinkering with the various ROMs, finally deciding I liked good ol' CM10.1 the best. After that I experimented with the Franco kernel, seemed to work great for battery life until I realized it was stuck at 100% forever then would shut off w/o warning at 20%.

I basically updated to the latest stable CM, thereby switching kernels, and wiped the dalvik and cache while I was in TWRP. Battery gauge seems to be accurate again.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
No suggestions other than those in the OP.

-bk
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Sounds good.

If the battery level sticks at 100% again and/or shuts down your N7 prior to 0%, just refer to the OP, and welcome to the club!

I just routinely leave my N7 off for a while once a week or so, usually during a recharge, and I've never seen this issue reoccur.

Good luck!
[Nexus 7 Q&A, Help & Troubleshooting] BobbaLouie:
I should have mentioned I did recharge it when powered down when I was changing back to the CM10.1 kernel.
[Nexus 7 Q&A, Help & Troubleshooting] surferdude73:
Ok so nada.

Left battery plugged in for three hours after leaving unplugged for 36hrs.

Plugged it in, no screen flicker, no reset, no power 60 seconds, no power + vol down worked. Nothing worked, just as before.

Left it on charge for 15hrs. Nothing.
[Nexus 7 Q&A, Help & Troubleshooting] Aessaya:
Ok, so i had the "doesn't boot at all, screen lights up upon charging but no picture" issue. Holding power+voldown while charging did nothing but flicker the screen as the tablet resets. However, i have tried holding down voldown button while plugging the charger in and magically a bootloader menu appeared, so i did the "power down" option, the tablet turned off, i removed charger, connected it back again and the charging graphics came up, i'll leave it to fully charge now and will report if it starts up, but so far i think it'll start up w/o a hitch now.

Thanks for the tips and you may want to add this one to somewhere to the OP, just in case someone runs into this problem as well.

update: it works! :good:
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Awesome!
[Nexus 7 Q&A, Help & Troubleshooting] Armada17:
Hi. on my Nexus 7 3G has a problem with self-discharge batteries in standby mode. maximum life in standby mode for 19 hours off WiFi and bluetooth and 3G. check with Battery Stats tablet goes into a deep sleep but why then he is discharged? sorry for my english.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
I might suggest that you post this question outside of this thread, on the main board, as your issue is a bit off-topic for this specific thread. You may have a better chance of getting answers to your issue if you do so.
[Nexus 7 Q&A, Help & Troubleshooting] reijndert:
Same problem here.

Just turned off at 90% or so.

Could turn it on again. Tried everything.

Finally disconnected internal battery, waited 15 mins.

Reconnected and put cover on.

Turned on immediately and showed 90% charge.

Very weird.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
I would recommend the practice of turning off your N7 every now/then, for more than an hour, possibly during an overnight charge.

You will likely never see this problem again.

Good luck!
[Nexus 7 Q&A, Help & Troubleshooting] noobxdauser:
Issue #4?

I just ready every post in this sticky and I'm not finding anyone with the same problem as me so maybe this is issue number four:

My N7 from 2012 was left alone for a couple months and even though it charges and works fine the battery level always shows 0%. I can charge it over night and just assume it is fully charged and use it for many hours - never actually counted how many - with no problem at all. I've completely reset/erased it many times with no joy. I gave up on this issue actually, but I'd like to upgrade it to 4.3 if I can. I have never pulled the battery but I think I've read that does nothing(?). If there was a way to trick the install into not checking for battery level I would love to upgrade to 4.3. The install file downloaded is there on my device, so it says, ready to install, just it complains about the battery level, even though it is plugged in the battery level is 0% and I have a charging indicator. Even when off I have the charging icon showing it charging... it just always says 0%.

Any advice for me?
[Nexus 7 Q&A, Help & Troubleshooting] noobxdauser:
Well showing what a true noob I am, I finally got brave enough to pull the battery cable off for a few seconds and it solved the problem, no more zero percent battery. Wow. I waited way too long to do that.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Awesome!

Yup - sometimes just pulling the battery cable will do the trick. Glad it worked for you.

As I said in the OP, this is a bunch of somewhat-related issues, with a handful of different fixes. Sometimes ya just gotta work through them all to get to the one that resolves your specific issue.

Enjoy your N7!
[Nexus 7 Q&A, Help & Troubleshooting] noobxdauser:
easy

Let me add, for anyone afraid of pulling the case apart, it was so easy and I did not even need tools, just my little fingernails. No harder than pulling the battery cover off any phone with a removable battery. In fact, you could easily carry a spare battery for this device and swap them in under a minute. No glue seal to break or anyhing. I watched this video to build my confidence youtube (link removed bysystem. Title of youtube video is "HOWTO: Remove and Replace Nexus 7 Battery"
[Nexus 7 Q&A, Help & Troubleshooting] mrdanastubblefield:
Further confirming all the replies here. Charged for an hour, disconnected power and immediately reconnected, and battery icon finally appeared. All is well.

Thanks!
[Nexus 7 Q&A, Help & Troubleshooting] hagizma:
after ota 4.3

It started to turn off from low battery even though it was plugged into a.c charger after 4.3 update. I feel like the ordinary charges is not enough for the device after update, how can I fix this?
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
You can certainly try the fixes noted in the OP - maybe they will help. But, your exact issue is a bit OT for this thread. Try creating a new thread and you are likely to get some good assistance here at XDA.
[Nexus 7 Q&A, Help & Troubleshooting] Naaser:
In the morning my nexus won't to turn on ,, I just hold power button for 20-30 second and its work,,
[Nexus 7 Q&A, Help & Troubleshooting] jptech:
I had issue 3 and luckily the google play support drone was a nexus 7 user and xda fan.

I can confirm plugging in and holding power for 30 seconds works.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Great to hear when things work!
[Nexus 7 Q&A, Help & Troubleshooting] surferdude73:
Yeah but when they don't...

Anyway, I guess I'll try the last few replies here again before calling ASUS.

Edit: Nevermind, just called them for RMA. Will report back.
[Nexus 7 Q&A, Help & Troubleshooting] rtiangha:
Just wanted to write about my experiences; might save some people some grief/spending unnecessary $$ on repairs and may save a few more Nexus 7s from hitting the landfill.

I had the same issue: Wouldn't turn on, wouldn't charge, wouldn't boot into the bootloader. Turned out that the battery connection to the main board became loose. That fixed it for a bit as I was able to boot into the bootloader and use the menu to power it off. Got the charge icon back, and I thought all was well. Left it to charge.

But then after an hour or so of charging, the device seemed to be dead. No charge icon, no nothing. Couldn't boot or boot into boot loader. I figured the motherboard was fried or something, so I ordered a new one off of eBay. When it arrived and I installed and reconnected everything, I had the same exact issues as before with the old motherboard.

So I ordered a new battery off of eBay and tried that. Voila! Charges fine and boots fine. Still need to try it with my old mainboard to determine if it really was the battery all along, but I know that switching back in my old battery with this new configuration again shows the same symptoms of not being able to charge.

Therefore, if all else fails and you're out of warranty, it might be worthwhile trying to track down a new battery. It could be that your current battery is too dead to revive (probably why Google replaced the power management chip in later revisions of the 2012 Nexus 7; the old chip may not have been doing a good job at shutting down the tablet before the battery was too far gone to re-charge) and all it needs is a new one.

And if anyone knows a way to externally revive a completely dead Li-po battery, specifically my old one, let me know. It'd be nice if it could be fixed after all. :)
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Thanks for sharing your experience.

Good to hear that things are back in order.
[Nexus 7 Q&A, Help & Troubleshooting] rtiangha:
Thanks! And I just installed my old mainboard this morning and it booted fine. So yep, it was a bad battery all along.

So...anyone in the market for a freshly wiped, 100% working and upgraded to the latest 4.3 android version 16GB 2012 Nexus 7 mainboard? It'd make a lovely upgrade to any 8GB versions out there. I do have a spare (some assembly required)... ;)
[Nexus 7 Q&A, Help & Troubleshooting] smiffyt:
Battery meter calibration problem

Hi, I have a Asus Tf201 and I purchased a ME301T for my wife approx 5 months ago, both great tablets but dock with each Tf201puts it in different league. The 301T started developing what appeared to be battery issues several days ago. The tablet switched off when showing a battery level of around 65 % an would not switch on again at least until it had been recharged.

Tried fully discharging and recharging, restored factory settings with no success. It looked like a battery calibration issue, I then came across this thread suggesting powering down the tablet for over one hour, I powered down the ME301T for over an hour and battery meter recalibrated itself and has worked great for the rest of today. I will power down overnight tonight and every week or so from now.

Sorry if posting in the wrong thread but is is where I found the solution to my problem. Many thanks for your help and a great thread.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
You are welcome!
[Nexus 7 Q&A, Help & Troubleshooting] smiffyt:
Battery Meter issues

Powered down overnight and all is well today. It is interesting that the common link between my wife's tablet and the Nexus is Asus/Google, would be interesting to find out what specifically caused the issue. Surprising that Asus/Google have not provided a fix or raised awareness with these issues.

My TF201 is powered down probably every week or so, however my wife never powers hers down. (at least until now) I have updated her tablet to Android 4.2, and a further interim update, so not sure if that has any relevance or not as posted elsewhere.

She does however switch her tablet on and off all the time when charging as she plays Words with Friends with family over the internet? I will keep reviewing the thread to see if the cause is identified.

Thanks again to billykxda, for this thread.
[Nexus 7 Q&A, Help & Troubleshooting] gbennett:
+1
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
You're welcome!

Hope you are enjoying your N7.

-bk
[Nexus 7 Q&A, Help & Troubleshooting] evobb10:
Thank you so much. My N7 back to normal. After 6hr off, it got a doctor finally. Just pressing power for 30 sec huhh
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Happy to help!

Don't forget to occasionally turn off your N7, maybe during a nightly charge. This still seems like the best defense to ward off many of these issues. I do this weekly, and I've yet to have another occurance since early this year.

-bk
[Nexus 7 Q&A, Help & Troubleshooting] millicent:
many thanks for this thread.

just solved my mom's n7 battery issue where the device just stops dead at around 30% remaining battery. as suggested in op, just kept the device powered off unplugged for 2-3 hours, it came back at 2%, it is charging now. Hopefully this calibrates it all right..

however my question for you savvy N7 users: seeing that this is a new device, bought it less than 2 weeks ago from B+H, I see mentions on these forums of a N7 with an improved battery controller as well, shouldn't I better exchange it for maybe the new N7, or maybe is there a way to tell the good battery chipset version from the box, or leave it be and calibrating the battery every once in a while the way I just did should suffice?
[Nexus 7 Q&A, Help & Troubleshooting] joel.inman:
logical fix

hey i am posting this here as i had just about given up with my nexus 7....i have read multiple forums and guides and no combo of button pressing, charging times etc has worked, my nexus 7 is out of warranty and i cant justify paying for a fix to a common and widespread problem.

anyway, i saw my nexus 7 lying on the table gathering dust earlier and it has been a few months since i had a look for a fix so i thought i wouold have another browse online to see if anyone had discovered a fix....nope!

anyway as im reading through the endless numbers of post and complaints but no actual solution that worked --- one popped into my head

think about it....

the issue is normally because the battery wont charge or hold enough charge to boot up-- mine has been in this deep sleep crap for a couple of months now so any charge it did have will have probably gone now anyway.

i tried the standard routine today of button smashing and left it plugged in at the wall for 6 hours while i went out to friends... came back no change, still in the nexus coma!

BUT, if the battery wont charge enough to boot even the slightest, can i run it straight from the mains?? that way i can manually boot it up and the shut it down properly before re-connecting the battery again

so i popped the back cover off, disconnected the battery, popped the back cover back on -- plugged it into the mains and the first site of life appeared in months ... be it only the "pixel party" it didnt boot, but atleast now i knew my charger was definitely working!!

so i unplugged it feeling a little optimistic, and re-connected the battery, the put the cover back on and inserted the power cable.....**sweating from the brow in anticipation** ....... one quick click on the power button and the battery charging icon appears!!!!! woooooo!!!

technically i dont know what has happened, whether getting some power into it before re-connecting the battery has helped i dont know but all i know is that after months of waiting and hours of searching online and sore fingers from all the button bashing, it seems to be working!!!

i urge people to try this if button pressing does not work for you and you are getting no life signs from your nexus!

i was so excited and chuffed i thought i would post straight away because it is such a widespread and common issue!!! i even joined this site today just to share it with you guys, i've been creeping on here for a couple of years though now, have just never had anything worth sharing before today!

i really hope this helps people....especially those that have almost lost hope

DON'T BE DEFEATED BY THE NEXUS COMA!!!
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Hard to make a recommendation on on this. I think the jury is still out on the 2013 N7's as users have posted here with the same ole' battery calibration issues. It comes down to how much time you want to spend and how much risk you want to expose yourself to. A different N7 could be "better", or it could have other issues - who knows. If I were you, I'd hold onto the N7 you have now and just turn if off once in a while. But that's me. It's really up to you.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
The tips in the OP will resolve this issue for almost all users. The most frequent cases where the tips here did not "work" was when the user never really read through the OP, or actually tried the tips.

It seems that in your case, removing and replacing the battery (which is one of the tips), didn't do the trick. But removing the battery, plugging in the N7 to the charger for a period of time, and then replacing the battery worked for you. Good news!

I'll keep this in mind as one of the possible fixes. If it's repeatable for others, I'll add it to the OP.

Thanks for contributing!
[Nexus 7 Q&A, Help & Troubleshooting] gostl:
Dont get discouraged about warranty (in the EU)

I've had the same issue and claimed warrenty with the place I bought my N7 (Saturn) only 2 Month earlier. They first tried to make me pay 265 Euros for a repair (ridiculous) ... I send them an email with friendly notice via Email that I'm going to sue them if they don't grant warrenty within one week - done, could pick it up three days later :)

My advice: Tell them briefly, kindly but firmly that you know your rigths. And dont by at Saturn/MediaMarkt :)

The battery-issue is well known and widespread and they have to take care of that, regardless whatever you flashed or elswise messed around with your device.
[Nexus 7 Q&A, Help & Troubleshooting] LordAurium:
Hi,

I really need some help with my n7. I have tried everything I could find on the internet, all combinations of buttons for various lengths of time, as well as disconnecting/reconnecting the battery and I still havent gotten anything from my tablet, its completely dead and wont charge. I cant afford to buy another one so if anyone could help me out I'd rteally appreciate it.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Hi,

Did you try every fix listed in the OP? Typically, if a N7 owner can't get their device to respond, it's b/c they really didn't read through the OP, then, they find a "fix" (that's already listed in the OP) somewhere on the 'net, tries it and it works. They they report their "find" here, only for me to point out that it was already listed in the OP. Maybe this isn't your case, but it happens so often it needs to be said up-front.

Reading this entire thread is helpful as well, as there are some tips that haven't yet been repeatable, but they may do the trick. One recent occurrence was fixed when the owner pulled the battery, connected the charger for a period of time, disconnected power, reconnected the battery and it worked. It's possible that applying power to the circuit w/o the battery was key, or it's possible that disconnecting the battery (possibly for a longer period due to connecting power) was the fix. Can't tell.

All of the fixes listed in the OP have worked repeatedly for N7 owners. Only a very small number of owners had an issue that persisted, causing them to return their devices.

Good luck. Report back.
[Nexus 7 Q&A, Help & Troubleshooting] LordAurium:
I did see that post and I tried connecting it with the battery unplugged and then plugging it back in but I got nothing. I also reskimmmed the op and i can veify that i have tried everything listed there. I have not used the tablet for the past few months as I left it home while I was away for the summer. I had a problem similar to this several months ago but the power +volume down was able to fix it. This time though nothing has worked. That being said I did see a sign of life from it which I will detail below so I'm hoping it isnt dead.

Two nights ago when I tried getting it to boot for the first time I plugged it into the wall using the charger and cord it came with and tried the various button and time combinations as well as disconnecting/reconnecting the battery and got no response. After that I tried plugging it into my computer and did the same thing and still no response. I got a little frustrated with it so I just left it there connected to my computer. A couple of hours later It suddenly turned on and I got the X symbol it shows when booting accompanied by a sound effect. It did this two or three times, never fully booting and then shut off again. Since then It has had no signs of life, but I have a hard time believing its dead after seeing the screen come on like that. Now when I plug it into my computer i get a windows message saying a usb device has malfunctioned, showing that it is being recognized in some way. I have also tried swapping the batteries in it with the battery from my friends nexus 7 and tried to boot it up so i could get to the bootloader and shut it down to have it charge correctly, but it still did not respond. I also had one of my friends who is a developer for android try and talk to it through the computer and he told me he could not even get it to read through its BIOS (i maybe saying this incorrectly as i am just repeating what i thought he said, i dont know much about android programming).

If anyone has any idea of anything else i could try i would be glad to give it a shot. The most frustrating part for me is that this is all happening about two weeks after my warranty has expired.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
If you have carefully performed every action in the OP, then you are probably in the small group of owners that need to return it for repair.

If you have not carefully performed each action in the OP, in detail, in order (again), you run the risk of returning the device when it didn't have to be.

At this point, this thread has shown that owners:

- discover that there was a tip in the OP that "really does work!"

- discover a "new" tip somewhere on the 'net that's actually listed in the OP (i.e. they never really read/performed the actions in the OP) and their device is fixed

- determine through careful examination that there really isn't any fix, and they return for warranty or repair

Hope this helps!