Four dead Nexus 7 devices )-:

[Allan Murphy Bruun]

Three months ago I bought ten Nexus 7 devices for my company. Four of them are now totally dead after not having been charged for about one month. The other six devices are working fine (right now at least).

When plugging in the power, the back light is turned on - but then nothing happens. I have tried holding in the power button for 15-30 sec, which seems to turn off the device before trying to restart. In this video you can see that after holding down the power button, the Nexus restarts with a bit of screen flicker (with the power cable connected). I do this twice in the video:

https://www.youtube.com/watch?v=xS71ywd2wxU

When plugging it into the PC the Nexus does not draw power from the USB port. I'm using the original cable and adapter from Asus.

I have tried checking the connector pin for the battery, which is correctly connected.

I would like to avoid having to return all of these devices to Asus: Any ideas on how I can get them working?

Regards,
Allan

 

[runamonk]

If they have been sitting for that long they will need to charge for at least 24 hours. Plug them in and leave them alone.

 

[runamonk]

And use the charger not a usb port.

 

[anon(4054009)]

If they have been sitting for that long they will need to charge for at least 24 hours. Plug them in and leave them alone.

Same thing happened to me 12 hours on charger , not USB port,and all was good.

 

[natehoy]

Had the same happen to mine when the battery dropped really low. Leave it plugged in for a few hours to a wall charger. Don't! Touch! It!

Forcing it to start before it's charged past minimum safe charge can permanently damage the battery, as is true of any lithium battery.

Sent from my Nexus 7 using Android Central Forums

 

[Aquila]

Noticed that on my N7 and the one I bought my mother in law; this thing REALLY doesn't like being at low charge. The official dock solves the problem 100%. Normal battery life for me is 2-3 days without a charge, now that I have the dock it sits there most of the time and is always ready to go.

 

[Golfdriver97]

Any USB connection is not a good charging point as a wall connection. As to why, I do not know (I would guess the power output on a USB is not as high as an actual charger), but I noticed on all 3 of my Android devices that the charge percentage goes up much slower than connected to a wall outlet. I agree with just letting it charge for a few hours without trying to turn it on. When completely charged, allow to drain completely, and fully charge again. After that, I would come up with some kind of schedule to charge them all on a three or four day period.

 

[Aquila]

Don't let lithium ion batteries die. They are served better with a top off strategy than wearing them down. Check out the threads on battery life.

Sent from my Nexus 7 using Tapatalk HD

 

[natehoy]

(I would guess the power output on a USB is not as high as an actual charger)

Good guess. Yes, that's absolutely the case. USB ports are limited by the electronics in the computer driving them, and weren't really built to run more than about a half amp through them. The wall charger on the Nexus 7 is a 2 Amp charger, so it can drive about four times the charging power as a USB port.