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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.
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wouldnt wiping battery info from CWM do the same thing?
hhwong said:
wouldnt wiping battery info from CWM do the same thing?
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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.
I have samsung galaxy s2 just over a month or so and i have big problems, due to battery. I know this is common issue on this device.
Until now i try to recalibrate battery like that, no hard reset. The phone it;s new and it had ICS 4.04 installed on the first place.
1) drain all of your battery untill phone shuts down
2) turn on and drain battery until phone shuts down ( repeat until you are unable to turn the phone on- this step is very important because we need to drain the battery competely)
3) take the battery out and wait 5 seconds or so and put it back in
4) Charge the battery while the phone is off
5) when the charge is 100%, take the charger off then charge again to get 100% again
6) turn on your phone and enjoy your new battery
Once i try to take the battery out after charge, and wait over 2 minutes. I know this is a common issue of s2, but i have some screens, maby someone had similar problem.
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Next, i'll try Battery Calibration (can't post the link, new user) tool from the market / wait for Jelly Bean official update. Then hard reset. Next step: service.
The screens
Time to get a new battery !
Sent from my GT-I9100 using xda app-developers app
Farooq95 said:
Time to get a new battery !
Sent from my GT-I9100 using xda app-developers app
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But it's a new phone, new battery (
great
The batteries in these phones can't be calibrated per se. Just use it normally for a bit. The peaks and troughs in your battery graph are because you're clearing the fuel gauge data. Mine would drop from the 73% I'm on now, to about 14% if I cleared the fuel gauge chip data, until it relearnt its settings. Just charge normally and use it for a few days, it will sort itself out.
If not, new battery.
Sent from my GT-I9100 using xda app-developers app
Im having the same problem. Tried swapping batteries with another S2, recalibrating the battery and even installed another rom, same problem persists. The phone will auto switch off after a few hours of not using (overnight especially), and batter will drain like mad when it happens. Brought the phone back to samsung for repair now.
Same here...
TheReverend210 said:
The batteries in these phones can't be calibrated per se. Just use it normally for a bit. The peaks and troughs in your battery graph are because you're clearing the fuel gauge data. Mine would drop from the 73% I'm on now, to about 14% if I cleared the fuel gauge chip data, until it relearnt its settings. Just charge normally and use it for a few days, it will sort itself out.
If not, new battery.
Sent from my GT-I9100 using xda app-developers app
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I'm currently having the same (really annoying) problem. My international GS2 is less than a month old and uses the latest official firmware on ICS. It happens almost daily -- or should I say nightly? The phone has at least 60-70% of battery left by the time a go to sleep. When I wake up in the morning, it's completely depleted. My stats look exactly as in the screen-shots in the first post. I'm always charging/using it "normally" but it hasn't sorted itself out.
I don't really know how to solve this and it's frustrating. The Internet has mixed "feelings" about the solution(s)... However, same as with my battery issue, I'm looking for something more stable and reliable.
Am I missing something? Does anyone know the exact cause and how to fix it?
Hello, I took the phone to a local service (pointed by Samsung from my country) and they replaced my motherboard and another pice of hardware....something in the recharging sistem, i dont know details. I think there is a "lot' of bad motherboards... people form the service call it a generic name.
In conclusion, the problem was the motherboard, not battery. I have recovered the device from service one day ago, if i'll experience any problems... i'll get back with details.
Cheers
I've googled around and haven't found a solution for this. I won't return it, as its not a dealbreaker. My Nexus 10 takes a few seconds to come on after pressing 'wake'. I am okay with this.
However, when it charges overnight, I wake it up in the morning to see '0% charge'. After rebooting, it correctly reports 100% and the battery lasts throughout the day for work. When I plug it in, on occasion, it does something similar. The battery suddenly swaps from 'xx%' (58% last night) to 0, and reboots. It did this on day one when I charged it, and I thought it might be an OS bug. Since I didn't keep the stock 'droid, and put CM10.1, the problem has persisted. What nobody seems to know, though, is whether this is hardware or software. Anybody have any insights?
Bumping to see if anybody can answer
Sent from my Nexus 10 using XDA Premium HD app
Hey I've searched for help on the subject all over and. I'm not seeing anyone with this problem, on the contrary everyone seems to be doing better.
Anyway I got the OTA update to 4.2.2 from the. General forum a few days ago and flashed it without much consequence and everything seemed fine. I reaquired my root but I have noticed my battery is losing charge way too fast doing light browsing and use.
Checking battery use I got 2 hours of screen time with 30% of the battery and again this has been simply browsing sites with pure text. As I'm writing this it went from 70% to 68%
To list a few key things that have happened that might be important and I'm hoping anybody can help or give advice.
1) I stupidly forgot to wipe cache and dalvik before and after flashing the update, when I remembered I went to recovery and did this
2) I rerooted
3) On Friday I fell asleep using it and when I woke up it was completely drained, honestly I don't even remembered what I was doing cause I had a bit too much wine but I think I was playing an emulator and when I woke up it wouldn't even turn on so I charged it back to 100%
As I write this now I think back and problem seems to have started then.
I tried re flashing a backup, which didn't help and I flashed franco kernel reading it gave good battery.
My last idea is simply reverting back to stock and see if it helps but before that I wanted to check some opinions or advice here.
PS I have already used BBS and its finding nothing wrong in wakelocks or use (except something called AudioOut2)
As I finish this im down to 66%, definitely not normal.
Any help is appreciated.
Sent from my Nexus 7 using Tapatalk HD
Having the same problem.
Didn't even make it to work and was below 50%. Weird.
Sent from my Nexus 7 using xda app-developers app
Did you at some point let it drain completely to 0% after updating to 4.2.2?
If nobody has any idea ill just go back to stock and report results.
Sent from my Nexus 7 using Tapatalk HD
Well if anybody has a similar issue or cares, going back to stock seems to have fixed the issue. Regardless I did some light testing on the battery. It shows marginal better perfomance on 4.2.2
By switching Kernel there was no change it seems but then again the test only covered two activities perhaps with further comparissons better results would be gotten.
But long story short if anybody has this problem apparently going back to stock is the way to go.
I'll keep a careful eye on the battery and gauge on regular use and if it happens again have a better idea of what caused it.
Its a program that's running or not completely shutting down.
Torrent was my issue. Uninstalled rebooted and then reinstalled.
My battery life is good now.all day and still over 80%.
Sent from my Nexus 7 using xda app-developers app
twyztyd said:
Its a program that's running or not completely shutting down.
Torrent was my issue. Uninstalled rebooted and then reinstalled.
My battery life is good now.all day and still over 80%.
Sent from my Nexus 7 using xda app-developers app
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Well I have encountered a completely new problem lately.
In the last week this has happened 3-4 times. I leave it charging or simply on deep sleep for a while and when I try to turn it on it won't, I'm not sure if its shutting down since when I plugged it in (thinking battery had drained) not battery charging animation came up, instead I left the power button pressed and it came up with whatever charge it had.
Not sure if its a side effect of the original problem of the battery discharge or something to do with torrent clients as 3 of the total times it has happened I was downloading something and left it running.
Not sure what to do at this point since I find no info on this or it happening to anybody else. What I find are things like it not charging etc which really arent my issues.
I will avoid using torrents on it for a few days and see if it happens again, if it does I will seriously have to consider contacting Google or Asus since this device doesn't even have 90 days in my possession yet.
If anyone is following this (really just posting here to help anybody who finds the same problem and as a sort of journal) I found this post on the kernel im running thread
http://forum.xda-developers.com/showpost.php?p=38422891&postcount=4603
Somebody replied to that post stating its a 4.2.x problem
It could also be a kernel problem with torrents as further down the posts another person complains about the same happening when using a bittorrent client
I'll post with whatever I find out.
I've been having the same problem glad to see it isn't just me.
Sent from my Nexus 7 using XDA Premium HD app
Hi Chaps, Since my upgrade to 4.2.2 I thought the battery life was great. It stayed at 100% for ages and when I was streaming music for a few of hours and the battery only went to 96%. Superb I thought..
But, yes there is a but. My N7 now shuts down when the battery is at 32% and I need to charge it to get it to reboot as it is well drained. Is it possible to zero the battery indicator or recalibrate it for an accurate reading? TATA R.
Sent from my Nexus 7 using xda app-developers app
robertsmith1873 said:
Hi Chaps, Since my upgrade to 4.2.2 I thought the battery life was great. It stayed at 100% for ages and when I was streaming music for a few of hours and the battery only went to 96%. Superb I thought..
But, yes there is a but. My N7 now shuts down when the battery is at 32% and I need to charge it to get it to reboot as it is well drained. Is it possible to zero the battery indicator or recalibrate it for an accurate reading? TATA R.
Sent from my Nexus 7 using xda app-developers app
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Click to collapse
Battery calibration, which should be done rarely, is merely a matter of putting your device through one complete charge/discharge cycle. Don't waste your time with battery calibration apps, as they are 100% snake oil. Likewise, you can disregard any misinformation about wiping battery stats, as that has absolutely no bearing on battery charge indication.
Try unplugging your battery for a few minutes, and then plug it back in, ensuring that the connector is firmly seated.
Getting pissed off here. N7 shuts down at 42% now. WTF. Is this a 4.2.2 problem? If so how do I revert back to an earlier version?
Sent from my Nexus 7 using xda app-developers app
Mine is ****ing **** since 4.2.2 and its official, writing this it went from 40 to 37 the ****
Sent from my Nexus 7 using xda app-developers app
I am seeing reduced battery life on 4.2.2...
I used to be able to go all day on a charge. Now I can't make it through the evening ...
I know that is subjective as I didn't indicate my prior usage compared to my current usage pattern.
But my perception is that battery life has degraded ...
As an aside, I noticed that an el-cheapo IKEA power strip didn't provide enough juice to keep the battery from draining further while using it when plugged in...
It plugged in at 20% and kept using the N7... awhile later I was in the mid-teens.
I don't use that power strip any longer....
Sent from my Nexus 7 using xda app-developers app
Hello, :fingers-crossed:
i'm having a lot of troubles with the battery of my Nexus 4. I'll try to explain this strange situation...
Few days ago i noticed a ridicoulous battery drain while i was, as usually, listening to some music with my bluetooth A2DP headset Jabra HALO2. It was something like 1% every less then 1 minute. At first i thought it was due to a recently upgrade to CM10.2M1 (which is a monthly build of Cyanogenmod on 4.3) or due to a 5 minutes fast charge from the 2A charger of Nexus 10 that could have "upset" the battery.
At first i started focusing on the software side problem; i tried CM10.2RC1, CM10.2, stock 4.3, stock 4.4 and now CM11M1, and, while doing all of those wipes, i noticed that not only the discharge was insanely fast, but even the charge! The graph on the setting panel is almost vertical while cahrging, like 3% to 40% in 25 minutes.
But that's not all, sometimes, after rebooting, i noticed a battery level different from the previous boot, so i decided to wait a full discharge and then fully recharge it. I have waited the 0% (not so much time ) putting the screen always on and the LED flash too, then, i tried few times to turn it on and every time, after the boot screen disappeared it immediately started to turning off due to 0% battery.
Moreover, for being certain, i tried to turn it on in recovery and wait how much time it would take to consume the lasting charge on the battery. Surprisingly, after 30 minutes it was still there! I tried a reboot into system, showing me a 10% remaining battery (WTF), which discharged to 0% in like 3 minutes. Now i'm waiting the whole night the real discharge in recovery with screen always on, hoping that a full recharge could fix it. I would like to evidence that the phone do not overheat during both charghe and discharge, so i guess the battery itself may be ok.
I'm still not sure if it's a software problem, and i'm worrid if it could be an hardware related issue. Maybe it could have been the charge from the 2A adapter.
I really don't know what to do next. Someone knows how to help me?
Here 2 screenshoots, I wasn't able to upload it normally so here the links:
https://drive.google.com/file/d/0ByucdM-SwPNnMlFUOGU4bXkzaGs/edit?usp=sharing
https://drive.google.com/file/d/0ByucdM-SwPNnZEtXczNuTXhiMGc/edit?usp=sharing
EDIT:
I've done a full discharge until even the full hybernation has been shutted down, but seems that it hasn't solved anything. I've also noticed that in the battery stat is missing the display consumption (WTF?!?). Maybe it's a CM11M1 bug, it happen even to my Nexus 10. Here other shots:
https://drive.google.com/file/d/0ByucdM-SwPNnazVacUNZeEZkUlk/edit?usp=sharing
https://drive.google.com/file/d/0ByucdM-SwPNnRHU2QlJibk5TVVE/edit?usp=sharing
EDIT:
As happened to the N10, after a while the display appear in the stats:
https://drive.google.com/file/d/0ByucdM-SwPNnMEozbzNRVGdzSHc/edit?usp=sharing
EDIT:
I've noticed just now that while I was waiting a real full discharge of the battery the TWRP couldn't show me the battery percentage. Really strange...
[SOLVED]
In summary, the problem was the combination of kernel+ROM. The CM with his kernel on N4 was consuming tons of electrons. I tried Purity+Hellscore, now i reach few days of low usage and one and half of medium usage
How old is your phone? You might be able to get a replacement from Google under warranty.
Sent from my Nexus 4 using xda app-developers app
I don't think it'd be the 2A charge, I use the 2A charger on my battery all the time.
Sent from my Nexus 4 using Tapatalk
EDITed main post!
sshark said:
How old is your phone? You might be able to get a replacement from Google under warranty.
Sent from my Nexus 4 using xda app-developers app
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Click to collapse
It have 9 months, and yes is still under warrenty, but I've bought it in Spain, and I live in Italy. I think this will be hard to solve
I have some strange problemi too.
Sometines the phone reboot itself and the battery drops (i tried to flash all stock: recovery, bootloader,ROM ecc..)
It could be a faulty battery.. Read this topic, it looks like you have the same kind of problems.
Do you also have simlocks/loss of network connection?
EDITed main post!
Faeshaas said:
It could be a faulty battery.. Read this topic, it looks like you have the same kind of problems.
Do you also have simlocks/loss of network connection?
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I've already read this topic, i think the source of the problem may be related with mine, but symptoms are different. It is strange that this happened 9 months later!
Gully discharging the phone, rebooting, discharge again if any, reboot. Connect charger, charge full. Reboot, charge full again if any, reboot. This always worked for me.
You can also try to fully discharge, completely power off the phone and let it fully charge while powered off ( only a white battery should be shown on the display).
Sent from my Nexus 4 using xda app-developers app
I'm having the same issues with my phone.
Sent from my Nexus 4 using xda app-developers app
Oxious119 said:
Gully discharging the phone, rebooting, discharge again if any, reboot. Connect charger, charge full. Reboot, charge full again if any, reboot. This always worked for me.
You can also try to fully discharge, completely power off the phone and let it fully charge while powered off ( only a white battery should be shown on the display).
Sent from my Nexus 4 using xda app-developers app
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Click to collapse
Already done, nothing....
Did all of u found the problem? Cause it seems i have the same...
Sent from my Nexus 4 using XDA Premium 4 mobile app
Amiramac said:
Did all of u found the problem? Cause it seems i have the same...
Sent from my Nexus 4 using XDA Premium 4 mobile app
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Click to collapse
Unfortunately, no. Probably it is a battery related problem, i'm going to replace it and see what happen. In the meantime not even PurityROM+HellsCore kernel may handle this battery draining...