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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?

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Welcome to the site. See the guides on about and How to Ask if you don't get an answer and decide to edit your question. They are often helpful in refining / reframing your query. –  patrix Mar 4 '13 at 5:36
    
Related, but not specifically w.r.t. iPad 4th gen and USB 3.0: iPad displays “Not Charging” when plugged into USB ports. What can I do? .. FWIW, if you turn off your iPad screen, it will charge slowly even from USB ports that cause "Not Charging" to display. –  Chris W. Rea Mar 4 '13 at 13:37
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