Nexus 7 False Battery Information

[Espis]

So, I'm having some oddities with my Nexus 7. Whenever I charge my tablet to 100%, the battery percentage stays on 100% for a disturbingly long time.(I love it when my devices stay on 100% battery, but this feels just wrong). Even though I use it a little bit after it's charged, it can go through the night(While I'm asleep and not using it) and even longer without dropping the battery percentage. At all.

That's not the problem, however. The problem is that my Nexus then dies at random times. The worst thing is that my Nexus doesn't even warn me of low power! Last charge it died as it had 18% left, and at this charge it died with 24% left. The only way to turn it on afterwards is to plug it in the charger, and hit the power button.

Does anyone else suffer from this too, and is there any way to fix it?

I use an app called Battery Indicator, if that's of any importance...

 

[rootbrain]

If you go to the settings and use the stock battery indicator, is it the same? If not, probably your app. If so, sounds like a defect to me.

Do you have root, custom ROM, kernel etc. etc.?

 

[Espis]

No root.

I can't find a battery indicator in the settings! My S3 has one, which I use, but I can't find one in the stock Android settings... Is it somewhere else, or not there at all?

Thanks for the quick reply, btw!

 

[PhaseBurn]

Your battery stats file is likely corrupted. To fix this delete the old one.

1. Root your device and install Root Explorer.
2. Plug in charger & leave in charging until 100% (overnight)
3. Reboot, leave charger plugged in.
4. Open your root explorer.
5. Open the 'Data' folder.
6. In the 'Data' folder, keep scrolling at the bottom and you will find 'System' Folder.
7. Open the 'System' folder and find 'batterystats.bin'.
8. Now you have to delete the 'batterystats.bin'. How to delete it?
9. Tap the 'batterystats.bin' and it will show the file option, select 'delete'.
10. Once it done, quick the root explorer, unplug the charger, and use the tablet as usual until it switches itself off (battery empty). Do not charge it.
11. Charge your phone while running phone as usual until it shows 100% battery.
12. Make sure that during discharging, you don't reboot your phone or the system will create a new batterystats.bin file or if already made, it will get corrupted and you will have to start again.

 

[Rxpert83]

If you're already rooted. Either do as described above or use the battery calibration app to so the same thing.

If you aren't rooted or don't want to root, the device may have to be replaced


Also, look under power for the stock battery info

 

[PhaseBurn]

If you're already rooted. Either do as described above or use the battery calibration app to so the same thing.

If you aren't rooted or don't want to root, the device may have to be replaced


Also, look under power for the stock battery info

Nah it sounds like a software issue. Doing a factory reset on the device will wipe the batterystats.bin file too so if they don't want to root that will work. Shouldn't need to replace hardware.

 

[Espis]

thanks for the advice, everybody! I think I'll leave my Nexus charging overnight now, and see if things change. If not, then a factory reset is the next step.

I have no intentions of rooting it (yet), unless I absolutely have to...

 

[dave1812]

thanks for the advice, everybody! I think I'll leave my Nexus charging overnight now, and see if things change. If not, then a factory reset is the next step.

I have no intentions of rooting it (yet), unless I absolutely have to...

had to reset my wife's n7 yesterday. wouldn't charge. all is well again

 

[PhaseBurn]

thanks for the advice, everybody! I think I'll leave my Nexus charging overnight now, and see if things change. If not, then a factory reset is the next step.

I have no intentions of rooting it (yet), unless I absolutely have to...

Makes me wonder why you're so anti root... first thing I do when I get a tablet/phone is wipe it, unlock the bootloader on it, and flash CyanogenMod on the sucker. Root is included along with a whole host of features and functionality that isn't in stock Android. I can't live with out CM these days.

 

[Rxpert83]

Forgot about factory reset.

I'm so used to helping rooted devices I forget what options are available for nonrooters


One great thing about rooting is it opens up loads of other options for troubleshooting issues.

 

[PhaseBurn]

Forgot about factory reset.

I'm so used to helping rooted devices I forget what options are available for nonrooters


One great thing about rooting is it opens up loads of other options for troubleshooting issues.

Opens up a lot of other options for a lot of things, hehe

 

[Espis]

Makes me wonder why you're so anti root... first thing I do when I get a tablet/phone is wipe it, unlock the bootloader on it, and flash CyanogenMod on the sucker. Root is included along with a whole host of features and functionality that isn't in stock Android. I can't live with out CM these days.

Good question, actually. I guess I'm still afraid of bricking the tablet and just screwing up everything. The main reason though is that I don't really NEED to root my devices. I can do what I want to without root access...

 

[PhaseBurn]

Good question, actually. I guess I'm still afraid of bricking the tablet and just screwing up everything. The main reason though is that I don't really NEED to root my devices. I can do what I want to without root access...

On some devices I could understand that. Devices with crippled bootloaders in general present a risk to the device but I can walk you through rooting with 0% danger to your Nexus 7. Unlocking the bootloader is fully supported by Google (though it does void your software warranty - Asus honors the hardware one) with no problem.

The steps are pretty simple:

1) Back up tablet (optional)...
2) fastboot oem unlock (will wipe all data)
3) fastboot boot clockworkmod-recovery-file
4) Do a nandroid of the stock factory image (recommended)
5) fastboot flash system cyanogenmod-rom-file
6) Factory wipe
7) Boot and set up tablet.

Easy as that, really...

 

[Espis]

Seems like everything is back to normal now... i used the nexus enough to make the power percentage go down a bit, and then used it as I normally do. Yesterday it was down at 4%, with all low power warnings popping up as usual. Don't know if this is a problem that will keep occurring, or if it was a random thing...