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Nexus 7 dying at 25% battery

Without fail my Nexus 7 seems to die around 25% battery. Strangely, this only happened after I unlocked/rooted it, but now it happens every time. I even charged to full, used CWM to wipe battery stats and let it run down from there, still no dice.
Safe to say I should get a replacement?

No? I'd be surprised if I'm the only one having this problem... Seems like the Nexus 7's hardware issues are pretty widespread.

I must admit, when it died, I dont know what % the battery was at.

omnikai said:
No? I'd be surprised if I'm the only one having this problem... Seems like the Nexus 7's hardware issues are pretty widespread.
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Click to collapse
Since youve rooted it, your warranty may be void, assuming that it wont be have you tried a custom rom? as daft as it sounds i had this issue on my old HTC desire, but a custom rom did fix this.
I havent had any issues at all with my nexus 7, my nexus was down to 8% last night when i plugged it in to charge before bed.
Aslo i wouldnt assume there are "wide spread" issues with the nexus7, for every device ever made there are always numerous threads about faults and the odd pixel being missing, people like to come onto the internet to broadcast there views when they feel they have been slighted or wronged in someway, if there was any "widespread issues with the nexus" (such as apples antenagate issue with the iphone 4) then it would be everywhere over ever tech blog.

Jjust reflash a different Rom
》》》Samsung Galaxy S3《《《

Been down as low as 2% before relenting and letting the poor thing power up. Rooted and on jr5.

Thanks for the feedback all, perhaps I'll try un-rooting it while at 100% battery and see if it fully discharges. Perhaps it's just sensitive about the battery capacity when it changes ROMs/Bootloader status.

My Nexus 7 is doing the same thing at 20%. What happened to yours?

Have you tried a factory reset? That's fixed similar problems on other devices.

Factory reset yes, but not at 100% charge.

Mine dies at/or around 30% - I'm stock+not rooted.

Factory reset it. It doesn't matter what the charge percentage is. I did it to mine and it's working fine

clear your batter stats in CWM, full charge, full discharge, full charge

davidcampbell said:
clear your batter stats in CWM, full charge, full discharge, full charge
Click to expand...
Click to collapse
I tried this and it didn't work for me. The only thing that did was a factory reset by flashing the stock image through the root manager tool.

A user named NeoMagus has received two units with this issue, but I haven't seen many people mention it otherwise.
http://forum.xda-developers.com/showthread.php?p=30787728#post30787728
I'm new to tablets but I returned a Fire with the same problem. I assume it's a freak battery thing and not something innate to this device.

Yup my first C6 and last C7 also had this problem. Charged/Decharged fine for about a week, then just started turning off at about 19-20%. The screen would also display in very small text "show low low battery logo". Re-flashing stock, wiping, calibrating by deleting batterystats.bin, nothing helped, always died at 20%. Just ended up exchanging both so don't know what to tell you guys, everyone else seems to be fine so my only conclusion is bunk battery

omnikai said:
Without fail my Nexus 7 seems to die around 25% battery. Strangely, this only happened after I unlocked/rooted it, but now it happens every time. I even charged to full, used CWM to wipe battery stats and let it run down from there, still no dice.
Safe to say I should get a replacement?
Click to expand...
Click to collapse
Flash back stock ROM, lock boot loader and see if it fix. At this point, you got back your warranty and can ask for replacement
Sent from my Nexus 7 using Tapatalk 2

I have the same issue on mine, which is stock/unrooted. I just did a factory reset and it's been okay so far, but it's a little early to tell if it really worked.
**UPDATE** - Doing a factory reset did not fix the issue. It died again after some more use. I'm going to return it to Google.
**UPDATE 2** - After connecting the device to the charger and powering it on again it reported 0% battery. I charged it back up to 100% and I've currently run it back down to 7%. I'm not sure how or why it's working now, but it does seem to be a problem with the software misreporting the remaining battery life.

Mine shut down at 9% last night. Not that bad but not ideal I think it should go to 2-4% or 'go down with the ship' at 0% like my phone does.
Oh well I'm going to get a replacement after my next trip due to audio and touchscreen issues, I've been putting it off in hopes that they iron it out but I can't wait much longer a dead left headphone and random zooming when I scroll is a drag.

Same here ,last week my N7 died at 15% battery
but now at 20% ..
no Low battery Logo show
Should i do Factory Reset ???

Battery 0% - Unkown

Hi,
My battery info screen is always showing 0% - Unknown. I´ve tried different charging options but with no success.
The battery is charging and when I connect the Nexus 7 to the adapter/pc is says charging - 0% when locked.
Any help is appreciated.
Thanks

Had the same problem. It was not ROM specific. Even though the reading said 0 it was still charging normally (as far as I could tell).
I called Google (I bought my Nexus 7 from the Play Store) and they replaced it. I think that the battery sensor was bad.
Sent from my LG-P999 using xda app-developers app

Charge your battery to 100 percent, for the best that you can assume as 100 percent - about 3 hours, - and then run this program https://play.google.com/store/apps/details?id=com.nema.batterycalibration root required
Sent from my rooted Nexus 7 via xda-developers app.

MrSchroeder said:
Charge your battery to 100 percent, for the best that you can assume as 100 percent - about 3 hours, - and then run this program https://play.google.com/store/apps/details?id=com.nema.batterycalibration root required
Sent from my rooted Nexus 7 via xda-developers app.
Click to expand...
Click to collapse
wouldnt wiping battery info from CWM do the same thing?

hhwong said:
wouldnt wiping battery info from CWM do the same thing?
Click to expand...
Click to collapse
OP did not explain if they were rooted or not.
Sent from my rooted Nexus 7 via xda-developers app.

Reflash kernel

Just to let everyone know I tried both that app and clearing battery sats in CWM, neither did anything. I even ran it dead and then fully charged with no change. The OP may have a different problem but in my case I definitely think it was a hardware sensor issue.
Sent from my LG-P999 using xda app-developers app

Um, weird, I came home after leaving my tablet on my desk all day at home, with about 35% battery.
It was dead. Like really dead. Dead dead. I don't know if it should've run down 35% totally idle; I'd left it for 3 days before without a problem.
Now when I plugged it in, it turned straight on. Google Screen -> Lock Screen. No colored X.
Showed 0% for 10 minutes. The battery graph was especially weird. For one thing, it had locked the stats and showed as still on battery basically. For another, it showed going from the low end of green to instantly dropping to 0%, red. Unplugged it, and it died instantly.
I'm letting it charge now with it off. Quick power button press shows the charging indicator thing.
I actually have an RMA out for this one for the touch screen issues, so it doesn't matter, but still... weird.

battery sensor/calibration issues
Old thread but I thought I'd add to it for other people with the same problem.
I have basically have the same issue on a stock, rooted 16GB Nexus 7. It's highly intermittent.
It first reared it's head about a month after I got the device (in Aug 2012), on the original firmware. My nexus 7 wouldn't (appear to) charge past 25% and would shut itself off after being on for only a few hours. I spent a day trying to fix it, including wiping the device, but nothing worked. Then magically, a few days later, the problem was gone.
The Nexus 7 worked fine for another month or so and then one day, after having charged it for several hours, I noticed that it was reporting a 0% charge. (Firmware was still stock but had been updated) This time it didn't power off, it just misreported it's charge. I could still run it for 10 hours or so, even though it said that it had a 0% charge and that I should connect the charger. I tried the "battery calibrator" mentioned in this thread which didn't seem to work but the next day, the device reported it had a charge. It's been randomly fluctuating between reporting 0% and a having charge every since. Sometimes it works fine for several days but then it will say 0% again.
It hasn't really affected my use of the device but it can be inconvenient not knowing how much charge you have left. Today I finally called Google and explained the problem and they promptly offered to exchange it. Hopefully this is not a design flaw but a faulty component from bad batch..

There's more than a good bit of bad advice in this thread. That anyone would waste people's time by recommending a ”battery calibration” app or to wipe battery stats is disheartening, as it is widely known that they have no correlation to battery indication.
More often than not, it seems, this problem with the N7 involves the battery connector not being properly seated.
Sent from my Nexus 7 using Tapatalk HD

I'm also having a similar problem, though when my nexus 7 completely dies from the battery I plug in and right away power back up and when it comes to the home screen with 0-1% charge it right away powers down. I tried leaving it off while pluged in let it charge for 5 mins and then power back up again till I see it have a minimum amount of charge, it seems to work not sure if its ROM or kernel related, I'll keep an eye on it.
There's a helpful article that seems to help other nexus 7 users, hope this helps
http://www.droid-life.com/2012/12/27/fix-nexus-7-refusing-to-charge-try-this-trick/
Via Galaxy Nexus [LTE]

I have the same problem with my nexus 7 3g.
Factory reset does not help.
Finally open the back cover (quite easy) and found that the battery cable connector is loose. So I tightened and my tablet is well again.
Hope this help.

Yeah what worked for me was to also unplug my battery. Seemed to correct itself after that. Mine would shut off showing a charge of 60%.

dudung0 said:
I have the same problem with my nexus 7 3g.
Factory reset does not help.
Finally open the back cover (quite easy) and found that the battery cable connector is loose. So I tightened and my tablet is well again.
Hope this help.
Click to expand...
Click to collapse
Does the back just unsnap like a regular battery door?

I have issues sometimes. Like the other night it charged all night and when I woke up it was fine, turn off the alarm on it and had breakfast. Came back and it wouldn't come on. Tried all I could without taking it apart. Ended up removing the back cover, unplugging the battery for ten seconds and then it worked fine. Battery was at 100% once it booted up.
---------- Post added at 08:07 AM ---------- Previous post was at 08:07 AM ----------
atistang said:
Does the back just unsnap like a regular battery door?
Click to expand...
Click to collapse
Use your fingernail to get between it and the chassis. It pops off pretty easy. Just be careful. I'm sure YouTube has a few videos showing it.

atistang said:
Does the back just unsnap like a regular battery door?
Click to expand...
Click to collapse
search for ifixit+nexus+7+battery
You can use your fingernail.

Nexus 7 - Battery 0% Unkown.
dudung0 said:
I have the same problem with my nexus 7 3g.
Factory reset does not help.
Finally open the back cover (quite easy) and found that the battery cable connector is loose. So I tightened and my tablet is well again.
Hope this help.
Click to expand...
Click to collapse
Hi.. I Have the same model and I had the same problem...
I made the turn off method (https://plus.google.com/+DerekRoss/posts/563EVVEPMDS) and did not work...
I rooted my Nexus to calibrate the Battery (http://forum.xda-developers.com/showthread.php?t=1838429) and did not work.
But the in my case the most simple solution works : Unplug /plug the Battery (http://productforums.google.com/forum/#!msg/mobile/Knrn4DThksg/ovuWYHUytZ0J).
Show this video about how to do it:
http://www.youtube.com/watch?v=bjh0H6SZHRM&list=PLBGUp1nK51h0Zyb2wIJjIhtTVQKyfj4BB&feature=mh_lolz
I hope have luck
bye.

Odd battery problems

Hello,
My N4's battery has been behaving really weird over the past days. My phone completely fails to predict the battery's current charge and it often would shut off at for example 40%. When I reboot it's at 0% charge and shuts down again. The battery at that point is 'completely' empty. Which means that even date and time have been reset!
You can see the sudden battery drop here:
Stats (after few minutes on charger):
The weird thing is, that although the screenshot says 4h runtime on battery, it was running more like 8 hours at that time.
The screen time is also calculated completely wrong. It should be more like 2 hours, but it says 43 minutes:
Besides that, it happens often, that I unplug it after a night of charging and while it says 100% while still plugged in, once I remove the cable it drops to ~90%, sometimes even lower.
This was today morning after a night of charging (same day as screenshots above). Mind, that I had to replug it to achieve 98%, after I first removed it before showering it was at 91%.
I'm running Franco Kernel and Mahdi ROM. Though the problem exists on other kernels and roms as well.
Should I revert to stock and completely whipe everything? The only thing I restored from Titanium Backup during Rom switches are user apps and wifi networks. So I wouldn't consider it dirty flashing, right?
I hope the battery itself isn't damaged, since I get a maximum of 2 hours OST, where a week ago I would get around 3,5h-4h..
Thanks for your input.
Edit: Forgot to say, that another problem is, when using the wall-charger, it would tell me after 20 minutes charging from 0% battery that it's at 100%, while after a reboot it again shows only 20-30%.

try using xposed disable battery critical shutdown to recalibrate the battery
if dosent work -> rma it.

opssemnik said:
try using xposed disable battery critical shutdown to recalibrate the battery
if dosent work -> rma it.
Click to expand...
Click to collapse
Thanks. As it has shut down again after about 3h on battery (1h of usage) I've noticed a relatively big buldge on the back of the phone. I think the battery somehow popped
I have absolutely no idea how that happened. Will write to the LG support now.

opssemnik said:
try using xposed disable battery critical shutdown to recalibrate the battery
if dosent work -> rma it.
Click to expand...
Click to collapse
what is rma?
edit: searched, now i know what is..

bragih said:
Thanks. As it has shut down again after about 3h on battery (1h of usage) I've noticed a relatively big buldge on the back of the phone. I think the battery somehow popped
I have absolutely no idea how that happened. Will write to the LG support now.
Click to expand...
Click to collapse
yeah, the n4 battery is really random. mine is doing that too, called lg and they will exchange it in few days

sergio_f said:
what is rma?
edit: searched, now i know what is..
Click to expand...
Click to collapse
Return To Manufacturer, looks like your battery is worn out. If your N4 is over a year old you'll need to buy a new battery.
Sent from my Nexus 4 using Tapatalk

Any recommendation for where to buy a new battery?

I have same problem bro
Your shutdown at 40% mine loses network at 40% and shut down at 30%
Sent from my Nexus 4 using Tapatalk 4
---------- Post added at 10:29 AM ---------- Previous post was at 10:28 AM ----------
I had no battery problem till my display cracked and i went to service center
Sent from my Nexus 4 using Tapatalk 4

Battery drops suddenly to zero then in complete charge

I have Note 4 SM-910C Unrooted international on stock ROM 5.0.1.
my problem started with battery charging to around 80% then stops or take like 5 hours to reach 100% then when I use the phone battery suddenly drops from 20-30% to zero.
if I remove the battery then reinstall it reads 16-18% but may drop back to zero.
when turned off while charged it charges to 100% normally
It is irrespective of charger/cable i use (2mA).
tried hard reset and battery calibrate (non-root) but no good.
Any help with this problem

aalim said:
I have Note 4 SM-910C Unrooted international on stock ROM 5.0.1.
my problem started with battery charging to around 80% then stops or take like 5 hours to reach 100% then when I use the phone battery suddenly drops from 20-30% to zero.
if I remove the battery then reinstall it reads 16-18% but may drop back to zero.
when turned off while charged it charges to 100% normally
It is irrespective of charger/cable i use (2mA).
tried hard reset and battery calibrate (non-root) but no good.
Any help with this problem
Click to expand...
Click to collapse
Sounds like your battery has gone rogue so you might wanna buy a new battery. A great example why not to buy Note 5 lol.
Maybe it's a bug in your rom build so why don't you try and upgrade from 5.0.1 to 5.1.1.
I have not used stock roms since the s2 days and after using custom roms I have never looked back.

Zionator said:
Sounds like your battery has gone rogue so you might wanna buy a new battery. A great example why not to buy Note 5 lol.
Maybe it's a bug in your rom build so why don't you try and upgrade from 5.0.1 to 5.1.1.
I have not used stock roms since the s2 days and after using custom roms I have never looked back.
Click to expand...
Click to collapse
i have the same problem with my N910F.. at 20% my phone dies.. like today it was 20% dropped to 4% in an instance and then died..
this is happening since upgrading to 5.1.1 (dirty)..
is it possible to fix this with a factory reset ?

Try Battery calibration and battery repair from the store... If it's not doing something, then replace the battery

make sure your battery is fully charged. From dialing interface typing in *#0228# to check battery info and clicked "quick start" at the bottom of the screen, then your battery will drop down quickly, try these steps several times.

inwithyou said:
Try Battery calibration and battery repair from the store... If it's not doing something, then replace the battery
Click to expand...
Click to collapse
any app suggestions ? also i forgot to mention my phone isn't rooted..
p.s. i had a random restart a moment ago.. is this battery related issue ?
thanx.

the same problem N910C.
Any solution?

I have the same problem with Dr.ketan port note 5 rom. I install cm12.1 and bug is gone! Just report

SUNUN said:
the same problem N910C.
Any solution?
Click to expand...
Click to collapse
Yeah, Samsung has a solution. Buy a new phone as they will never update the 1 year old one even though they ****ed it up...
As much as Iove Note family I am more and more pissed with Samsung and eventually will stop buying their ****.... Already done with their watches by the way...

Definitely a degraded battery problem.
I got a new battery and problem now solved.

I have the same problem and already bought a new battery but the issue continues.
(Sorry for my English)

10-20% (+/-) battery drop after a reboot

I've already tried doing a battery calibration as recommended by many people on the V20 threads, buts this is still happening to me. If I reboot my phone, when the phone comes back on, my battery level has dropped 10-20% (give or take). I know reboots can consume battery, but this is quite a large consumption.
Last night, for example, my battery was at 60%, but after I rebooted, I was immediately at 25%.
Again, I've down the whole calibration thing at least 5x now, and it hasn't helped with this. So now I'm wondering:
1) Is anyone else having this issue, especially with the same variant as me (see below)
2) Is this a Nougat 7.0 issue
3) Is this a battery (hardware) problem. I ordered one of the spare battery kits that come with an extra battery. I figured that I'd try the new battery, but if it doesn't help, then I have a second battery anyway.
ATT variant (h910)
Running on ATT
Battery life has been mediocre to poor, and I've disabled so many features by now that it's gotten kinda ridiculous.
Sent from my SM-P600 using Tapatalk

Try the battery if not, warranty, that's not normal

wing_addict_usa said:
Try the battery if not, warranty, that's not normal
Click to expand...
Click to collapse
Yeah, I didn't think it was normal. I was hoping it was a Nougat 7.0 issue, but I wasn't hearing anyone else with this issue. And as stated too, my battery life hasn't been great. I make it through the day, but only of the phone isn't used much. Otherwise, the battery will drain pretty fast.
Sent from my LG-H910 using Tapatalk

What was your calibration method? Running it down to zero once should be good enough then charge with phone on or off without using it to 100%. If still doing it try your other battery. If still doing it exchange.

@rbiter said:
What was your calibration method? Running it down to zero once should be good enough then charge with phone on or off without using it to 100%. If still doing it try your other battery. If still doing it exchange.
Click to expand...
Click to collapse
I pretty much did as you just said.
I ran the battery down until the phone powered off. Then I kept attempting to power it on until the LG logo stopped showing up and the phone said that there wasn't enough power to turn on. Then I charged the phone to 100% while phone was still off. Once it hit 100%, I left it charging for another 2 hours.
Overall, it helped, but once I reboot the phone, the battery always drops quite a bit as stated in my first post.
Sent from my LG-H910 using Tapatalk

spexwood said:
I pretty much did as you just said.
I ran the battery down until the phone powered off. Then I kept attempting to power it on until the LG logo stopped showing up and the phone said that there wasn't enough power to turn on. Then I charged the phone to 100% while phone was still off. Once it hit 100%, I left it charging for another 2 hours.
Overall, it helped, but once I reboot the phone, the battery always drops quite a bit as stated in my first post.
Sent from my LG-H910 using Tapatalk
Click to expand...
Click to collapse
Do you have twrp intalled? I think Lg has a problem with it's battery stats because of the removable battery. On my v10 I had two spare batteries. When one got to like 4% I would power down and pop in the new one. When back on it would read the battery at like 19% or something to the liking. I had to leave my phone off for about 30 secs between changes. I was having similar issues to what you're describing with my v20. I ended up formatting data in twrp and then set my phone up old school style with manual app installation and no data transfer whatsoever. I let the phone die completely and then charged while on uninterrupted. I then at 100% unplugged it and plugged it back in for 20 minutes. My battery has been perfect since. I would also note similar issues on the G4 too. I think this is the cause for the notorious Lg bootloop.. My G4 did it right before the battery drained out and so did my V10..

I had that problem on an old note 4. But not a drastic a jump in percentage. Brought it to Samsung and they just changed the battery and the problem went away.

Swizzle82 said:
Do you have twrp intalled? I think Lg has a problem with it's battery stats because of the removable battery. On my v10 I had two spare batteries. When one got to like 4% I would power down and pop in the new one. When back on it would read the battery at like 19% or something to the liking. I had to leave my phone off for about 30 secs between changes. I was having similar issues to what you're describing with my v20. I ended up formatting data in twrp and then set my phone up old school style with manual app installation and no data transfer whatsoever. I let the phone die completely and then charged while on uninterrupted. I then at 100% unplugged it and plugged it back in for 20 minutes. My battery has been perfect since. I would also note similar issues on the G4 too. I think this is the cause for the notorious Lg bootloop.. My G4 did it right before the battery drained out and so did my V10..
Click to expand...
Click to collapse
I have the ATT V20, which doesn't have the bootloader unlocked. So, no TWRP.
Sent from my LG-H910 using Tapatalk

koppee1 said:
I had that problem on an old note 4. But not a drastic a jump in percentage. Brought it to Samsung and they just changed the battery and the problem went away.
Click to expand...
Click to collapse
I heard similar issues when I had my Note 4, but in this (using a new Android OS that not many other phones have yet), I wasn't sure if this was hardware or software. I really hope the second battery fixes the problem!
Sent from my LG-H910 using Tapatalk

spexwood said:
I have the ATT V20, which doesn't have the bootloader unlocked. So, no TWRP.
Sent from my LG-H910 using Tapatalk
Click to expand...
Click to collapse
I would still try a full reset if you haven't yet..

Swizzle82 said:
I would still try a full reset if you haven't yet..
Click to expand...
Click to collapse
I'd rather not since I don't have the time to re-setup all the programs I need for work. It takes several days to get everything up and running again, and after having to do this 2x already this past month thanks to the Note7, I don't want to go through it all AGAIN. Its too much of a hassle and shouldn't be necessary since this is a new phone. I mean, w y reset a new phone that's only a couple weeks old?
Sent from my LG-H910 using Tapatalk

spexwood said:
I'd rather not since I don't have the time to re-setup all the programs I need for work. It takes several days to get everything up and running again, and after having to do this 2x already this past month thanks to the Note7, I don't want to go through it all AGAIN. Its too much of a hassle and shouldn't be necessary since this is a new phone. I mean, w y reset a new phone that's only a couple weeks old?
Sent from my LG-H910 using Tapatalk
Click to expand...
Click to collapse
Do as you wish I understand, just a suggestion..

Swizzle82 said:
Do as you wish I understand, just a suggestion..
Click to expand...
Click to collapse
Thanks. I only factory reset as a last resort. Ill do it if nothing else fixes the issues (including a new battery).
Sent from my LG-H910 using Tapatalk