Battery charging of ipad2 using USB cable

I am unable to charge my ipad2 when attached via USB to any of my computers.  It states "not charging" on the ipad.  Are there any settings I need to change in order to charge via USB?

chris5354 wrote:
Ipad 2 will charge with usb cable even it show "not charging" it just take a longer time because regular usb port does not give out 10w, let connected overnight and you'll see its charging...
or you can install a software called ai_chargexxx (i forget the full name) on your PC, just google it
This is not correct.  If the battery icon on your iDevice doesn't show the lightning bolt, it isn't charging no matter how long you leave it on there.  Most accessory USB ports on computers aren't powered and are bus-powered drawing power from the computers USB interface without a seperate power hookup.  That aside, for devices the require more power than this, they will not work with this type of USB, as in the iPad.  Most USB's that have the juice to power anything are typically found on the back of the computer and typically only provide 500mA which again is pretty low.  That would charge it, but you might as well watch corn grow which would be faster.
As for the software you speak of, not heard of it, but willing to check it out.

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