[Q] Nexus 7 powers off after boot - Nexus 7 Q&A, Help & Troubleshooting

I'm having some trouble with my Nexus 7. I foolishly discharged my battery fully. Now, when I plug it in, it boots up immediately, and then powers off with static after a few seconds, so I can't charge it properly. Do you know a way I can force it to charge without booting?

vahokif said:
I'm having some trouble with my Nexus 7. I foolishly discharged my battery fully. Now, when I plug it in, it boots up immediately, and then powers off with static after a few seconds, so I can't charge it properly. Do you know a way I can force it to charge without booting?
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That literally just happened to me haha but k I left it off and let it go to the charging screen then had a shower which took about 30 minutes then I reboot it and it had 8% battery and now everything is working
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xfrancis14 said:
That literally just happened to me haha but k I left it off and let it go to the charging screen then had a shower which took about 30 minutes then I reboot it and it had 8% battery and now everything is working
Sent from my Nexus 7 using Tapatalk HD
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The problem is that for me it doesn't go to the charging screen, it tries to boot, crashes, and tries to boot up again. I'm pretty sure it won't charge much this way and it doesn't seem very healthy.

That's odd um try if you have twrp go there and see if it says the battery is charging, if not can you get into your bootloader okay?
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Try this thread http://forum.xda-developers.com/showthread.php?t=1805772
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Related

[Q] Question regarding battery

I noticed that my nexus 7 automatically shuts down when the battery level is at around 12-14%. Is this normal? Does the nexus 7 have some sort of automatic shutdown feature to prevent battery depletion? If yes, is there a way to edit that option?
Thanks!
Does it?? Im stock rooted and the lowest I got mine to was 5% I'll give it ago today and hammer the battery see if mine shuts down
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I can see the battery go down to 1% before auto-shutdown.
Stock, rooted, 4.1.1
Must be a problem with my unit then. I'll try to tinker with and see what's the problem.
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Have you done a few full charge cycles since you got the N7?
i.e. fully discharge till it doesnt even power on into bootloader, then (while power off) charge to 100% in one sitting.
Repeat.
Do that a couple of times.
Im gonna try that. Thanks!
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Is there a fix for slow charging issue?

Since i updated my device to 4.2.1 charging my nexus 7 really get slow..... It takes 6 hours to 7 hours to fully charge. Im using the cable and charger that it came from the unit.
Is there a fix for this one? Thanks.
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AW: Is there a fix for slow charging issue?
Check whether the device charges in USB mode. It can happen for some reason I don't know. In this mode it charges much slower. I once had it happen when on AC.
It's on AC. It takes 6 hrs to fully charge from empty. =(
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Got a fix on the issue... Im rebooting my device everytime i charge it.
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ianmedina said:
Got a fix on the issue... Im rebooting my device everytime i charge it.
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Click to collapse
What do you mean by rebooting it? I have the same charging problem. It needs about five to six hours for me to charge fully. How did you solve it? Is it really the problem of android 4.2.2?
Just try rebooting it or restart the device while charging. Im using battery widget reborn app, to see how many hrs left to make my nexus 7 to be fully charged.
Here's what i do,
Plug the charger then check after 2 mins on the app battery widget reborn how many hrs left to be fully charged, if it's says more than 4 hrs or greater than that. Hit the power button and restart your device. Once the device booted up, check the remaining time left on charging if it's improved to 3 hrs or less to fully charged your device.
Try it. It's working fine for my nexus 7.
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ianmedina said:
Just try rebooting it or restart the device while charging. Im using battery widget reborn app, to see how many hrs left to make my nexus 7 to be fully charged.
Here's what i do,
Plug the charger then check after 2 mins on the app battery widget reborn how many hrs left to be fully charged, if it's says more than 4 hrs or greater than that. Hit the power button and restart your device. Once the device booted up, check the remaining time left on charging if it's improved to 3 hrs or less to fully charged your device.
Try it. It's working fine for my nexus 7.
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Click to collapse
I tried the app you mentioned. But the remaining time it indicates isn't equivalent to the real time used. Maybe this app doesn't work for my device, it still needs four to five hours for my nexus being fully charged. Anyway, thanks for your reply.
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Or you may try to go to bootloader, then turn it off.. Unplug the charger, then put it back in then turn on your device.. It works for me.
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Ultra fast charging..

Wow check that out has anyone's device done that? Stock charger, batt went from 50% to full in round 5 mins...?!
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Then, after you reboot, the percentage stays the same?
Nexus4 modded with cyanogen.
mine done that once... but it was trolling me.
After reboot? Nah.. it dropped to 28%!
Fastest discharge in history too.
Fail
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My N4 did that once even worse, went from 7% to 100% in under 10 minutes, I was do confused. I had to run out so I grabbed it and took it with me, battery went to 97% after about twenty minutes then phone just shut off. Plugged in and had the red led. I plugged in and booted to recovery and let it charge a few, then booted up and it was at 3%, has been fine since.
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Do you by any chance have lightflow installed...? I recently had my Nexus 4 going from 29% to 100% in perhaps 10 seconds and I have never seen this before and I have had the phone since december but have just installed lightflow about a week ago - after a restart everything was back to normal though....
No lightflow here...also hasn't happened again either so it seems random.
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Sudden battery drain

Hey guys!
Today my phone was at about 10% charge, so I decided to charge it. After I plugged it in, it immediately said charged (I unplugged it after it said charged). After about 30mins the phone completely turned off and wouldn't turn on. When I went home and plugged it in, a red light started to blink. After fiddling around with it and finally being able to turn it on, I went into the battery menu and realized there was a sudden drop. I would appreciate it if anyone could tell me why it happened, a fix/ a way to prevent this from happening!
Edit: I am using paranoid android 3.69 with twrp 2.6 and Franco kernel 3.4 milestone 3
Android 4.2.2
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thats a pretty big issue, but I just ran into a similar issue. My battery life was at 73, and then i powered off the phone then powered it back on. it was still at 73. then i powered off again and powered on again and it was down to 65. Not sure why that is, did you power off/on your like this too?
dabadoo said:
thats a pretty big issue, but I just ran into a similar issue. My battery life was at 73, and then i powered off the phone then powered it back on. it was still at 73. then i powered off again and powered on again and it was down to 65. Not sure why that is, did you power off/on your like this too?
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Click to collapse
no my phone was on the entire time. It had 10% charge so i plugged it in and then it said 100% charged. then i unplugged it. after a while it turned off by itself.
mmaster261 said:
Hey guys!
Today my phone was at about 10% charge, so I decided to charge it. After I plugged it in, it immediately said charged (I unplugged it after it said charged). After about 30mins the phone completely turned off and wouldn't turn on. When I went home and plugged it in, a red light started to blink. After fiddling around with it and finally being able to turn it on, I went into the battery menu and realized there was a sudden drop. I would appreciate it if anyone could tell me why it happened, a fix/ a way to prevent this from happening!
Edit: I am using paranoid android 3.69 with twrp 2.6 and Franco kernel 3.4 milestone 3
Android 4.2.2
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Woah, this is either a big coincidence or has something to do w/ PA. I had same thing happen to me and I had to RMA my phone. It had only been a few days since I had installed PA for the first time.
What do you mean by "I had to RMA my phone"? Sorry i dont know many terms.
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Didn't unlocking the boot loader void the warranty? How did you get a replacement?
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mmaster261 said:
Hey guys!
Today my phone was at about 10% charge, so I decided to charge it. After I plugged it in, it immediately said charged (I unplugged it after it said charged).
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Click to collapse
It's this... the battery is bugging out if it instantly jumps from 10% to 100%... mine did this the other day actually... nfi how to fix it besides having it shutdown
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Sorry if this is a nooby suggestion, but maybe get a battery calibration app?
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I did try that and I'm currently not experiencing any issuesl. Thanks for the suggestion!
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Strange problem with nexus 4

My friend recently bought an imported nexus 4 from eBay(on my advice). He's having a strange a problem. The device works normally till the battery drains below 50%. But then it suddenly turns off and doesn't turn back on again. When he connects the charger, it's stats charging from 0% again. The charging process is also normal.
Anyone had this type of problem?
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adil_ said:
My friend recently bought an imported nexus 4 from eBay(on my advice). He's having a strange a problem. The device works normally till the battery drains below 50%. But then it suddenly turns off and doesn't turn back on again. When he connects the charger, it's stats charging from 0% again. The charging process is also normal.
Anyone had this type of problem?
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Click to collapse
Whats the rom and kernel?
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Try charging it to 100%, disconnect charger, reboot and check if it already lost some charge during reboot. If yes charge full again.
I had something similar (not a total drop, but a fast drop when below 50%) a few days ago and this helped. I don't know why, though.
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I think you should try both suggestions.
Also inform us what is the ROM and Kernel he is using.
Keep us updated.

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