Hello i want to know how long does the dock takes to charge the nexus 7. What %/hour does it take? i am having trouble charging my nexus7 because i think the micro usb port has become loose and the power cable wiggle a bit when plugged. I want to build a custom dock just to charge the nexus 7 via pogo pins. Apart from slow charging there is no other problem...I tried different ROMS and removed all apps to test if any app were eating juice more than expected
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Hi,
I am building my own Nexus 7 dock so I can charge it via the pogo pins. I am using power from the supplied Nexus 7 charger, but when I charge via the pogo pins and then disconnect from them, any form of charging stops (usb or pogo). The only solution I have found to this problem is to wipe the cache and reboot the device. This is inconvenient to require a reboot every time I take the Nexus 7 out of my charging dock. Does anyone have a good solution?
Thanks in advance.
ROM -> SmoothROM-v5.2
KERNEL -> timur-usbhost-2013-04-21-cm10.1
also with multirom and Ubuntu (not part of my problem)
update
I was messing around with it some more, and after charging from pogo, only pogo charging would work. I could not charge from usb. I can charge with pogo, unplug, and then re charge from pogo just fine. Any suggestions? It sounds to me like a kernel problem but I want to keep timurs kernel because I can use multiple usb devices at the same time.
asdfjkljkl5 said:
I was messing around with it some more, and after charging from pogo, only pogo charging would work. I could not charge from usb. I can charge with pogo, unplug, and then re charge from pogo just fine. Any suggestions? It sounds to me like a kernel problem but I want to keep timurs kernel because I can use multiple usb devices at the same time.
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Have you asked timur about this problem? He is always really good about helping diagnose problems and make a fix.
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A Nexus 10 with Android 4.2.2 cannot be concurrently charged with a pogo plug while using a USB OTG connected accessory. Has this deficiency been fixed with the Android 4.3 update?
I wonder if this isn't so much a deficiency as a way to protect people from frying the tablet by charging through pogo and usb at the same time. So by default they disable usb while pogo's charging.
Sent from my Nexus 10 using XDA Premium HD app
lynnux said:
I wonder if this isn't so much a deficiency as a way to protect people from frying the tablet by charging through pogo and usb at the same time. So by default they disable usb while pogo's charging.
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Well for the Nexus 7 (original model) there is a custom kernel that enables what I am asking about. Also from what I read it seemed like a deficiancy as the code is there to stop concurrent charging from both the pogo connector and USB but unfortunitely it is cutting off pogo charging even when a OTG USB device is drawing power and not charging what so ever. The notification charge indicator displays as if the device is charging but that is false. An OTG cable has more pins (5?) than a USB charging cable (3?) so it seems a solution should be possible.
I'm no expert and am only going by what I've read but it makes sense to me that when the microUSB port it not charging that the pogo connector should be able to. Personally I think the pogo connector has been abandoned and will not likely be included in the Nexus 10 refresh unless Android 5 (Keylime Pie) addresses this issue. Assuming, of course, it has not been addressed with Android 4.3.
So, I apparently did something very stupid with my new Nexus 7.
I have a few 1 TB external hard drives, which don't get enough power via an OTG adapter from the Nexus 7 to run. So, I purchased a two into one cable -- that is, a cable that combines two male USB A plugs into one Micro USB B plug so that a USB 3.0 hard drive can use two USB 2.0 ports to have enough power. I had planned to use this to enable use of the hard drives with the Nexus 7 while traveling by plugging one cable in the tablet and the other into a charger.
When I got the cable I tested it by plugging one of the USB A plugs into my Nexus 7, and then I plugged the other into my computer's USB port. The Nexus 7 promptly shut down, the computer complained of a power surge on the USB port, and a distinct smell of melted plastic came from the computer's USB port. I guess the combining cable didn't combine so much as it just acted like a double headed male A USB cable and shorted things out?
The Nexus 7 refused to restart afterwards until I it plugged it into its charger. It works now, mostly. However, if its battery charge is above about eighty-seven percent then it always reports that it is charging, regardless if it is plugged in or not. And if I plug it into a computer while it is reporting that it is charging I have to restart the tablet to get it to connect to the computer -- I guess it thinks it is connected to a charger and doesn't bother checking for a data connection unless restarted.
The level where it stops thinking it's charging varies somewhat -- I've had it still claim to be charging all the way down to eighty-two percent charge, and by repeatedly opening the battery app over and over again I have been able to get it to notice that it's really not charging all the way up to ninety-one percent, but no higher, and I have to open and close the battery app an increasing number of times for every percent that it goes up over eighty-seven before it will notice it's not charging.
Any idea what kind of damage I'm looking at? How to fix it? Whether I can get the warranty people to fix it free of charge? If yes, whether they will send me a new one or just fix the one I have? Whether it's worth getting fixed since it mostly still works, and doesn't really bother me as long as it doesn't get worse?
Nothing?
Nothing from anyone?
Try replacing the internal USB plug? About $25. Easy to do your self.
Hi,
I just picked up a used Nexus 10 for an app I'm building. I specifically needed this tablet as it an NFC reader both on the front and back of the device. Everything was great until I realized that the battery drains faster than it charges with the screen on and in use. I am using the POGO charger with what I believe is the stock Samsung plug (output 2A).
I've done some searching and it seems that this is a known issue with this tablet. Are there any known solutions?
Will buying and installing a new battery remedy this? I don't even necessarily need it to charge back up, I just need it to hold steady at its current charge while the screen is on and in use. Thank you!
OK, I realized this is because I simultaneously have a micro USB cable plugged in to a serial device and am using the Nexus 10 as an OTG host device - so even though it shows charging, it's actually not charging at all it appears hence the draining. If I unplug the micro USB device (which supplies its own power, even), the Nexus 10 begins incrementing battery %, slowly but surely.
I will try getting a Y cable for the micro USB portion per a thread I found on androidcentral.
Hello all,
First thread here and hoping you guys and girls with more experience can help.
Basically I am fitting my nexus 7 2012 in my car but its got the common charging problem where my battery drains faster than I can charge it.
I have ordered a new USB port strip as I've read that can fix it and fingers crossed with that.
My problem/requirement:
1. I want to charge the tablet via the usb port using a hardwired 5V 2A device this will be plugged into a otg y splitter which is then plugged into the tablet.
2. The USB A side of the splitter I want to connect to my cars ECU (it has a USB port) so I can read the data on that (basically a very expensive memory stick)
I wanted to confirm that this would work and id be able to read data at the same time as charging it.
I also wanted to double check I'm not somehow going to send my 5v 2a power down into my ECU and set it on fire
On a side note, if my new USB port replacement doesn't solve the issue of charging the tablet i will have to remove the battery and hardwire it in, will i still be ok with using the USB port for the ecu while charging hardwired with no battery?
Kind Regards
Tim
Getting any USB 2.0 device to take current while hosting is tricky.
Usually it involves talking directly to the PMIC (power management IC).
If it's a fixed installation, why not remove the battery?
It will avoid the grief of the battery swelling up, which is not too unusual for things plugged in all the time.
I've been using a Nexus 7 (2013) for a few years, but just charging on USB.
It started falling out of its nice holder.
That's when I realized that the battery was all puffed up making the back convex.
I cut off the battery cell itself on the metal tabs and soldered in wires to a 4 V 2 A supply.
I found out that the BMS is a bit balky, it refused to turn on.
So I connected it to USB to "charge" it for about 10 seconds.
Then I could turn it on (without the USB).
Ok, I could have bypassed the BMS entirely but that can be a whole 'nother can of worms too.