USB Charging


macrumors regular
Original poster
Apr 19, 2010
Solomons Island, MD
Is anyone else having issues with charging their new IPad from the computer's USB port. I have the dock plugged directly into a late 2011 I7 27" IMac (no Hub) and the IPad shows not charging, seems strange.


macrumors 6502a
Mar 7, 2011
My computer has never been able to charge the iPad. Many can, but its common not to be able to. I suppose 2 --> 3 may have raised the power requirements a tad.

The iPad 3, as far as I can tell, charges significantly slower than the 2 (as makes sense, same charger larger battery) so USB charging would be near useless anyway.


macrumors 68040
Jul 9, 2008
Okie land
This battery is not going to charge much at all off USB.

I actually lost 10% of the battery during the restore process connected to my Mac Pro with USB.


macrumors regular
Jun 8, 2009
If you see it saying "Not charging" its because the screen is on and the iPad is active.

It'll charge even from a standard USB port as long as it is not in use at the same time (screen off). It'll take forever to do it since that's a quarter of the power from the supplied AC charger, but it'll charge.


macrumors member
Oct 11, 2011
Mine just barely charges on the USB of my 2011 MacBook pro. It gains 1 percent every hour or so while being used.


macrumors newbie
Mar 16, 2012
Not Charging usb to Sony Vaio

I know I know *huge audience groan* but I have not upgraded to MBA yet. I've had the first generation iPad and now the 3 and neither have charged while plugged to the USB port of my laptop.

One thing I did notice, however, is how hot-to-the-touch the AC adaptor becomes when plugged into the wall outlet. The male part of the cord itself that is plugged into the square thingey becomes VERY hot.

I've not experienced this with my original iPad. Is this a defective product that I need to have replaced or is this the general accepted consensus - being all warm n such, I mean?


macrumors newbie
Sep 20, 2008
Portland, Oregon
New iPad Not charging with USB cable extension

One thing I noticed right off is that the new iPad 3 won't charge from my Mac Pro (late 2008) with a heavy-duty, third-party 6' USB extension cable, even if it's plugged in directly to a system USB port. It does seem to work, however, with Apple's own thin 3' extension. Neither the USB ports on my 23" Cinema displays (same era as my Pro) or a USB PCI card I'm using provide enough oomph.

Gefen and some other companies make USB extenders that may help. My issue is that I have a somewhat long cable run to my CPU.