yashsingh1/xdaforums huggingface dataset:
[Asus Transformer TF700] NickS VR4:
Then leave it attached, makes no difference. Add the numbers up to 200%.

If you have 80% battery, what difference does it make if its 0% and 80% or 40% and 40%? (I know battery sizes are different and percentages would be different).

Now overall battery is down to 80%, if you detach tablet with scenario 1, you have max battery left (80%) vs 1/2 of that (40%) if the dock had a charge remaining.

Why should the dock keep any charge? It still works with 0%.
[Asus Transformer TF700] Crizthakidd:
because some of us do not want to let it waste charge when the tablet is already near full. (save some charge for later). we dont want to recharge it just because it gave too much power to the tablet at an uncessary time. i bet alot of people dont want it to charge the tablet to 100% from 99 everytime u turn the screen on lol , it would just make life better with the tablet + dock if we could control when it does charge during sleep ,ect
[Asus Transformer TF700] jtrosky:
I'm trying to understand what the problem is here... What good does it do for the dock to keep a charge? You can't use the dock without the tablet and as long as the tablet is connected, the dock will work, even if it reports a 0% charge. So what good would it do to keep, let's say, the dock at a minimum of 10%? That 10% would be completely "wasted", right?

Or am I misunderstanding the issue?
[Asus Transformer TF700] MartyHulskemper:
I do not get the issue either. On I go to a relevant thread.
[Asus Transformer TF700] Einride:
I was under the impression that the dock will eventually "power off" and you won't be able to make use of the keyboard, USB port and SD card reader once its battery is depleted. However, if they're still fully functional as long as the tablet is connected, I don't really mind the current way it's done.

Surely the dock requires some power to operate though, and unless it gets that power from its own battery, the tablet will have to power it. It's this "obfuscation" of actual battery capacity and use I find slightly annoying.
[Asus Transformer TF700] Svashtar:
After reading this thread and after some thinking i can dig both camps :laugh:

On one hand, we are concerned about a battery lifespan, and as it is well known that batteries should not deplete to 0%, i can dig those who want to control that. But, there is also a mention that the battery doesn't really go down to 0% and it somehow controls that automatically.

So, no worries on this side.

The other "problem" - which i think is more important, at least to me - is that some of us feel that it is completely unnecessary for the dock to charge the tablet if the later has 99% of battery. I would also like to have some kind of control over this.

Both 100% - i want to use only tablet battery. And i will use it until it drops to about 30-40%. Than i would like the dock to kick in and refill my tablet. Probably right in the middle of my other work when i actually don't use a tablet (faster refill as i am not using it). Well, after it reaches 90%+, please docky dock, get out of the way and wait for your next turn. Maybe i'll refill you, too :)

So yeah, there is actually NO problem at all, only different use cases. I bet every single one of use has a little bit different usage pattern and with an app to customize these things, we could and should all be happy.

Anyone, anyone? I would like to beta test it :)
[Asus Transformer TF700] Diogenes5:
The issue is that Li-ion batteries lose max harge every time they are depleted. You do not want to constantly cycle your battery because of this. The dirty solution is to stop using your dock before this happens but i use my infinity for work and this is not an option.

Sadly after only about a month of use my dock maxes out at only 98% now after being forced to completely dicharge it while working. At this rate, I will lose almost a quarter of the dock's charge in a year. Thats completely unacceptable. For such an expensive device.
[Asus Transformer TF700] usern ameisval idandnot:
Thanks for the nice conclusion. Let me sign this paper.

@Diogenes

I have seen this often. I dont know what causes this behavior but there is reason to believe it will charge to 100% again. If not keep us updated.
[Asus Transformer TF700] PolishPoet:
Same here. I use the tablet with and without the dock. I like having the tablet with the 80% rather than 40/49%.
[Asus Transformer TF700] Midnitte:
the problem is that lithum ion batteries degrade over time, this is exacerbated by a full discharge, try using google for research on the matter.

sent from LG optimus s (republic wireless) on tapatalk
[Asus Transformer TF700] jtrosky:
Yes, but the way that I understand it, even though the dock reports 0%, it actually does still have some juice left, so it's not *really* depleting all of the way...

At least that's the way I understand it...

But, to each their own! :)
[Asus Transformer TF700] Diogenes5:
I hope you are right. I would like some clarification from Asus on the matter. My dock sometmies charges differently for no apparent reasons. Sometimes both dock and tablet will deplete at about the same rate; sometimes the tablet will depelte faster; and sometimes the dock will be drained dry. Usually the dock is drained dry though over time (tablet always has more than at least 30%, many times myuch more, in my experience when it does)

I expect some Asus rep to say, "That's because you're only suppose to use the official Tf700 dock" marketing spiel.

Note: my dock now shows 100% again. I still do not like seeing it go down to 0% when my tablet is at 90% though.
[HTC Sensation] 2pacsk8:
hello people I'm from Brazil, I have a sensation after I unlock my sensation no longer enters into the system, so the screen is the htc start, I used the kit One_X_All-In-One_Kit_v1.0 and I believe that the kernel of one x in sensation

and its not enter more bootloand do I enter the installation of rom to start over when vai not enter the kernel I used was the Stock_Kernel_26394
[Nexus 7 Accessories] tahlsr:
I've searched and never seen an actual 'buyable' product linked on the forums so if this is a dup, I apologize.

Anyone try one of these and see if you can have your Nexus in host mode and charge at the same time?

Is the only option for the female Micro USB port to bring more charge to a usb device plugged in and not to bring charge

to the Nexus itself?

Two scenarios would make this ideal for me:

1.) using my usb xbox controller to play games yet still keeping my tablet charged

2.) using a usb thumb drive to play a movie while still keeping my table charged

I think this would be pretty cool if it worked but I don't know the technical details on if it can be done with our Nexus 7's:

http://www.ebay.com/itm/110931117836
[Nexus 7 Accessories] kenyee:
Looks like it's meant for providing power to the USB device you connect (e.g.. external hard drive) instead of to the Nexus7...
[Nexus 7 Accessories] dcplaya:
The eBay description says it provides charging the the micro-USB port. Only way to know is to buy it and try it out
[Nexus 7 Accessories] vzwty:
Who's going to be the Guinea pig?

Sent from my Nexus 7
[Nexus 7 Accessories] RED ZMAN:
Hell, I'd do it, but I don't have a Nexus seven yet. LOL

I've been waiting for someone to get a working solution fit this before I purchase one. That and I need good 3.5mm sound quality and I've read its ****e on the Nexus 7.

Blasted from my HTC Rezound (Zone23s Newtified 3.2.1)
[Nexus 7 Accessories] AraDreamer:
My sounds works fine, and I haven't even bothered getting the volume + app yet for tweaking. I think there's just no pleasing some ppl with a bare bones tablet like this one.

-Ara
[Nexus 7 Accessories] RED ZMAN:
I have a OK Galaxy Tab in the dash of my car, and use the headset port for music, didn't want to upgrade without seeing one in person.

Hopefully some sort of dock solution will make Otg and charging possible and I can upgrade. Thanks!
[Nexus 7 Accessories] WinDroidGuy:
Ordered 1, but says shipping is between September 7 to September 20 :( haha
[Nexus 7 Accessories] CasualStarlord:
OTG and Charging is mutually exclusive, the OTG cable triggers the USB controller to send power out to a device, not receive power.

the pogo docks on the bottom of the device are also impossible to charge from as the nexus 7 has only been given one charging circuit, and that is the same one that OTG disables.

The only way to achieve something like this would be a physical battery hack where you splice in a charging circuit direct to the battery, without frying the phone maybe some unidirectional resistors, so that it can be simultaneously charged whilst powering the device.

I'm 99% certain of this information, and this is not to say someone might hack a kernel together one day
[Nexus 7 Accessories] barkerd25017:
you might be able to install one of them batteries you can just set it on a charging pad and it will charge

View attachment 1275126
[Nexus 7 Accessories] WinDroidGuy:
I have a ZAGG battery pack I'm planning on trying this with and I will report back :) I also have that same pad and I can get a fairly cheap charger to place on the matt as you say. Either way that wouldn't be very convenient, but I'll check it out :)

Sent from my Galaxy Nexus
[Nexus 7 Accessories] Entropy512:
Wrong. https://github.com/teamhacksung/and...mmit/4c1c965b168bc4488ef66889e1c8933bc1b3de46 for an example on Galaxy S2/Note

As to whether the adapter linked is a proper OTG ACA (they're VERY hard to find) and whether the grouper supports OTG ACA is unknown. It's something a kernel developer can probably implement.
[Nexus 7 Accessories] CasualStarlord:
Thanks Entropy512, I can see it working on other devices, that gives me hope... I might rig something up myself now, I've wanted to take a cheap usb keyboard plastic leather cover, and build in an extra battery, card reader and usb hub, now this might be theoretically possible :D
[Nexus 7 Accessories] memphian:
http://xdaforums.com/showthread.php?t=1822653

I don't have a N7 yet, but when I get one I want to try that.
[Nexus 7 Accessories] ED2O9:
I can confirm that simply splicing a standard OTG cable into the port and plugging in a power cord will not work. I thought I'd utilize the empty socket from where the rear camera was supposed to go, and try to fit the OTG-to-microSD set-up inside of the Nexus. I bought a salvaged USB/headphone port from a damaged Nexus off of Ebay for $1 and the smallest microSD adapter I could find. With the use of a ribbon cable from an old laptop, some trimming, and some REALLY careful soldering I was able to make it work... sorta. Stickmount sees the card and everything runs great, until you plug in a power cord. Then, it disables the microSD adapter, and even though Stickmount says it's there, no files are visible. Also, the Nexus won't charge with this arrangement.

It might work with a different set up, but simply mimicking the OTG cable will not allow a Stickmounted volume and when the charger is plugged in.

(BTW - To make everything fit, I had to use a Dremel to grind away some of the mid-frame area around the rear camera space. It's a tight fit, but keep in mind that until you have a spare mid-frame, like I do, you'll obviously void your warranty.)
[Nexus 7 Accessories] Mechanio:
I tried this very thing, same results.
[Nexus 7 Accessories] veeman:
Has anybody tried charging through the pin connectors on the left side?
[Nexus 7 Accessories] nst6563:
Same here, only I went a step further and added a 36k resistor from the ID line to ground and that didn't do anything either.
[Nexus 7 Accessories] Cetin:
Hope all your work ends in success.

I would like to put this device as a car Entertainment system later. But charging and USB otg is a must.

NEXUS 7
[Nexus 7 Accessories] l0rdraiden:
It's a nice method to use in a couple of years your old Nexus 7 as a seedbox
[Nexus 7 Accessories] ZedZardoz:
Another pair of devices to consider...

Higher priced, but a little more elegant without the extra cable mess:

4-in-1 USB host adapter (reviews state charging on some devices):

http://www.amazon.com/Samsung-Multi-functional-Connection-Kit-Compatible/dp/B006MJZOMW

5-in-1 MHL/USB host adapter (YMMV):

http://www.amazon.com/Juiced-Systems-MHL-Adapter-MicroSDHC/dp/B008CQKM2U/

:confused:
[Nexus 7 Accessories] nm8:
Wow that second link looks the ticket but its pricey. Will wait for cheaper alternatives.
[Nexus 7 Accessories] ollie.olsson:
As anyone looked into this solution? How would a resistor solve the problem?
[Nexus 7 Accessories] mariolouis:
There are references to usb otg spec where a resistor instead of direct shorting of id pin to ground, initializes host and charge at the same time. My xperia arc does that at 110k ohm iirc. Depends on the device what value is to be used. Some used as low as 36k. I believe there were only 3 values the manufacturer could use should they adhere to the standard. Let me look it up where I have read it.

Here you go: http://en.m.wikipedia.org/wiki/USB_On-The-Go#section_6
[Nexus 7 Accessories] ollie.olsson:
Cheers bud!
[Nexus 7 Accessories] Entropy512:
36k is what Cyanogenmod supports on Galaxy S2-family devices.

There's a good chance that 36k will work IF the kernel is patched to support that mode (see my link above to the Galaxy S2 implementation - since the N7 has a different PMIC, the patch would be very different, but you can at least get an idea of the concepts involved.)
[Nexus 7 Accessories] mitch27:
I ordered and received this exact same cable. It did not work on my S3 or a Galaxy Note. Maybe it will work for the Nexus 7? I'm not sure.

Edit: I was trying to charge via the micro usb port. USB OTG works for me on my S3 and Note, but the micro usb female port does not charge my device.

What I ordered: http://www.ebay.com/itm/ws/eBayISAP...931117836&ssPageName=ADME:L:eek:U:MOTORS:3160
[Nexus 7 Accessories] xmoo:
You guys should try a Micro USB Y Cable like the one from XTC Clip.

This works, USB OTG + Charge

http://www.ebay.com/itm/HTC-HD7-Unl...822?pt=LH_DefaultDomain_0&hash=item3f1bf0d1c6
[Nexus 7 Accessories] sami_22:
Anyone has tried or buy this OTG cable now ?
[Nexus 7 Accessories] mariolouis:
Will not work as Nexus 7 wants data pins shorted to initiate charging. Of course no data transfer if those pins are shorted. :rolleyes:

That is also why some chargers do not work, most especially Apple ones. Actually every charger should work. Albeit some will charge it slowly. Just need to "hack" the cable and short out d+ and d- together. :beer:
[Nexus 7 Accessories] Jewremy:
I can confirm that cable off of ebay charges/provides power to whatever is on the female end of it. Power won't go to the n7 or my gnex.
[Nexus 7 Accessories] shiner88:
look here:

http://rootzwiki.com/topic/30615-can-you-charge-usb-host-mode-simultaneously/page__st__30

http://mehrvarz.github.com/otg-power-nexus7.html
[Nexus 7 Accessories] jrmatics:
OK I got the cable from eBay, and installed the kernel patch and its working great on my n7.. After the recent updates to stick mount everything is proper now.. Charging and have my 32gb flash drive connected and running is awesome. I also have a USB 10 port powered hub which supplies power to my n7 with no problem with everything connected.. Watching movies from of my flash drive and charging at the same time is what's up
[Nexus 7 Accessories] alxndrs:
I'm also looking at the solutions the OP wanted, there's a Bobj product at Amazon that is 5 in 1 pack, one of the reviewers said it charges his Nexus 7:

Because of post limitations, on amazon: BobjGear Android Tablet Cable Adapter Set

Anyone tried it yet?
[Nexus 7 Accessories] pachi72:
If only Google would stop being a bunch of A-holes and put SD card support on Nexus devices..WOW...
[Nexus 7 Accessories] chaitanyapramod:
Do you have the link to the ebay listing?
[Nexus 7 Accessories] jrmatics:
Ok try http://www.ebay.com/itm/140868254215?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

That's the one I got, just ordered another one just to have.. it works great with the kernel patch
[Nexus 7 Accessories] maxjivi05:
I'm on 4.1.2 is there a kernel patch I can use to charge and use usb devices. I can't figure it out
[Nexus 7 Accessories] thefever:
I've ordered one of the previous mentioned cables as well. Will report back when I get it.

Sent from my Nexus 7
[Nexus 7 Accessories] jrmatics:
I got the kernel patch from here http://mehrvarz.github.com/usb-host-mode-power-management-nexus7/
[Nexus 7 Accessories] diba320:
Does this kernel work with stock 4.2.1 or only with a CM 10?
[Nexus 7 Accessories] jrmatics:
I'm on stock 4.2.1 and no problems so far
[Nexus 7 Accessories] Osiris19:
What about this cheaper one?

http://www.ebay.com/itm/Micro-USB-H...711&pid=100011&prg=1005&rk=2&sd=140868254215& Sent from my Nexus 7 using Tapatalk 2
[Nexus 7 Accessories] jrmatics:
That one should work, honestly if I would have saw that one I would have gotten it instead
[Nexus 7 Accessories] Osiris19:
I just got my otg cable that I paid $0.94 for but if I wanna use my 320gb external hard drive for movies, I want power so I'm gonna order this. Free shipping, $3, can't beat it.

Just saw, that one is a bid.
[Nexus 7 Accessories] maxjivi05:
That is for 4.2 =( to many bugs in 4.2 from what I read
[Nexus 7 Accessories] kl25:
mind sharing where you got your USB hub??

thanks!
[Nexus 7 Accessories] jrmatics:
I got it from amazon http://www.amazon.com/gp/product/B00483WRZ6/ref=oh_details_o07_s00_i00. And when plugged in it supplies enough power to charge your nex 7
[Nexus 7 Accessories] Zlgibby:
Jrmatics I was wondering if you can take a picture of your setup please it would be very helpful. I plan on doing this to mine but when I look at the cable you bought it looks werid, I can't put it all together lol.

Thanks in advance for the help
[Nexus 7 Accessories] jrmatics:
Ok here's my setup the portable battery pack works fine now with any cable since the latest ota.. the otg y has male and female. Connect power to female and male goes to ur device and I have a 32gb flash drive connected to usb
[Nexus 7 Accessories] jrmatics:
ok here's the first setup I mentioned the above post is the otg y cable
[Nexus 7 Accessories] jrmatics:
And this is my usb hub setup which works with everything I've plugged in so far,, and don't forget that patched kernel
[Nexus 7 Accessories] thefever:
I am using it successfully on CNA 3.8.1 (Android 4.1.2). I had to flash this boot img

http://mehrvarz.github.com/usb-otg-power-nexus7/

I haven't had any issues with it. I'm not using stickmount, due to the fact that CNA has USB Storage built into it. I only use a 32gb mini usb drive, and have had no issues with it.

Here's my setup at my desk. Using a Motorola BT Keyboard, Soundfreaq Sound Kick BT speaker, and a cheap little Motorola BT Mouse. I think the mount is a Arkon.

USB OTG Host Mode Cable

Battery "Charging"

Storage Overview
[Nexus 7 Accessories] Zlgibby:
Thanks guys for all the help and I got the boot IMG all ready to be installed once I root this bad boy. Waiting for my laptop to come back from dell
[Nexus 7 Accessories] thefever:
I meant to update my post with the boot img I used. I noticed he had a newer one up on his github, so I downloaded and loaded it up, and it has some better improvements when it comes to plugging and unplugging. Check out his github repo to make sure you have the newest one.

https://github.com/mehrvarz/files

i think it was 2012-11-15 boot img
[Nexus 7 Accessories] Zlgibby:
Also if I go to this website

http://mehrvarz.github.com/nexus-7-kernel-download-page/

Do I want the mobile or fixed install for 4.2.x JB if I decide to keep my stock ROM or if I go another JB ROM based route, which one should I used.

And with Clockwork recovery I can just install the kernel right? Or should I wipe cache and dalvik

I've rooted phones and installed ROMs before but not just a kernel

Thanks again guys

---------- Post added at 05:13 PM ---------- Previous post was at 05:05 PM ----------

Not a big CM10 fan I like JB ROMs
[Nexus 7 Accessories] diba320:
Anyone with a 3G already tested the kernel?
[Nexus 7 Accessories] thefever:
Looks like according to this info here: http://mehrvarz.github.com/usb-host-mode-power-management-nexus7/

Most people I would assume use the mobile version. Seems like the fixed would maybe be for a car install or something similar...

Sent from my Nexus 7
[Nexus 7 Accessories] Zlgibby:
Thanks a lot looks like fixed install might be good for me considering this will be in my car as a headunit . Thanks for the help guys
[Nexus 7 Accessories] diba320:
Installed the modified kernel on my N7 3G ... does actually not work as expected.

First charging worked with the Y-cable, but no Access to the USB stick.

Rebooted ... does not Charge any more with the y-cable.

Access to the USB stick with the y-cable. But as soon as I try to connect a USB to the y-cable while having it attached to charger (no charging Symbol), the N7 freezes and rebbots.

Don`t know if this is an N7 3G issue or something with my setting.

OTG w/o the y works fine ...
[Nexus 7 Accessories] Kodiack99:
Yes the Fixed is for a permenant install,I have it on my car install.It only allows power to go one way so if there is no power supplied from the ac then the otg doesnt rob power from the tablet.So when you have a tablet setup to wake on power and sleep on power off it doesnt run the tablet battery down by supplying power to a device not being used,it also is more robust auto detecting devices on wake.The kernel works excellent and many props to Timur for a fine job,he put alot of work into this.
[Nexus 7 Accessories] jrmatics:
I installed the latest kernel also and have the same issue with 16gb WiFi only version as it was working properly with an older version of the patched kernel. Think I'm gonna test the older versions and see which one works properly for me again
[Nexus 7 Accessories] diba320:
Posted my issues on RootzWiki as well. Timur is working on a updated version which is adressing these crashes.
[Nexus 7 Accessories] diba320:
Timur just uploaded an updated version for JB, works on my N7 3G without Problems now! THX

The link, because it is not on the "regular" downloadpage actually: http://timur.mobi/files/
[Nexus 7 Accessories] jrmatics:
Thanx for the heads up, working great now..
[Nexus 7 Accessories] diba320:
The files are on his "regular" download page now as well:

http://mehrvarz.github.com/nexus-7-kernel-download-page/
[Nexus 7 Accessories] bigdog2k7:
I have a Nexus 10 and wonder if this kernel will work for me as well? I am trying to hookup external SSD through OTG and charge so I can watch movies.
[Nexus 7 Accessories] Kodiack99:
I dont think it will and I wouldnt try.
[Nexus 7 Accessories] peterlcj:
Interesting
[Nexus 7 Accessories] goobieracing:
Where did you get the stand? I really like the setup
[Nexus 7 Accessories] taffypride:
Running SmoothRom with the CM10.1 version of the Timur Kernel and I can't get the charging to work, but I can use the USB Host bit and see my memory stick
[Nexus 7 Accessories] thefever:
Thank you. Got the stand here:

http://www.amazon.com/gp/aw/d/B004M8ST36/ref=mp_s_a_1?qid=1357427859&sr=8-1&pi=SL75

It's made for a windshield mount, but it works pretty damn good on my desk, since it's glass. When I bought it originally, it was like 5 bucks cheaper.

Sent from my DROID4
[Nexus 7 Accessories] winged mantis:
No, kernels are compatible only with the device they are made for
[Nexus 7 Accessories] Hewell:
Here 2.91€ http://www.ebay.es/itm/Usb-type-A-f..._USB_Cables_Hubs_Adapters&hash=item19d886ddae