iPad 4 not charging solution with usb 3.0 dual ports Y adapter Just recently picked up an iPad 4.  Saw that it specifies "not charging" when plugged into the usb port.  Saw that it is a common issue due to usb power.  I have usb 3.0 ports on my desktop so I tried that and the same result.  USB 3.0 is specified for up to 900 ma while 2.0 is 500ma.  Course even that can change depending on a few things.  Seems that the iPad wants up to 2.1 amps.  So I searched for solution using dual usb ports like some external 2.5" laptop hard drives use.  I found nothing which surprised me.  If I can get 900ma x 2 ports (for 1.8 total amps) I am near the full charge spec for the iPad.  

Such cables seem foreign but I found 2 of them.  Most Y cables like this come with a mini usb at the end so these are unfortunately rare and more expensive (unless you want to solder your own which I suppose I could do too with my abundance of cables).
http://www.shopaddonics.com/itemdesc.asp?ic=AA2USBPC
http://www.newegg.com/Product/Product.aspx?Item=N82E16812161003

From here the lightning cord would simply plug into the female end.  Anyone tried something like this?  Result?
A few years late, but something like this will help.

SinLoon-Enhancer Y splitter Hub Adapter Cable-Female-Charge-Extension

It's a Dual Male USB Cable, one of the male connectors are for power, the other for power + data.  It should give you a full 1AH with the power connectors from both USB ports, assuming your hub can output more than 500mah total.