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iPad Charging Other Hardware
Just in case people are not aware, although an iPad connected to a computer displays 'Not Charging' (this is the case on my MacBook Pro, with or without power cord and on my MacPro) the iPad is actually charging albeit slowly, works great overnight.

[crarko adds: My understanding is that there is enough power provided by the USB port to charge the iPad when it goes into sleep mode. That's obviously not the case while it's syncing with iTunes so it shows the 'Not Charging' message. Macworld ran an article covering the topic of iPad charging that gives a great detailed explanation of what is going on.]
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iPad Charging
Authored by: everkleer80 on Feb 04, '11 08:11:10AM

Someone told me about the iPad saying 'not charging' when plugged into their computer, and I was confused since I've never seen this. I plug mine into the back of my iMac and I'm pretty sure it shows that it's charging regardless of whether I'm syncing (and the other night I plugged the USB in to bring it back to life after the battery died and as soon as it came back on I went back to the game I was playing and I played for about an hour.) I can't imagine the USB on my iMac is any more powerful then that on a Mac pro...



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iPad Charging
Authored by: designr on Feb 04, '11 09:53:32AM

Yes. Yes it is. The laptops run off the batteries (even when plugged in). The USB ports have slightly less power. The exception may be the Air b/c it was redesigned to power Apple's external DVD burner.



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iPad Charging
Authored by: everkleer80 on Feb 04, '11 11:10:31AM

I assumed the iMac might give a little more power than the MacBook Pro, but the OP said this also applies to his Mac Pro.



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iPad Charging
Authored by: mmm-five on Feb 04, '11 12:24:28PM

My iPad connected to my MacPro (3,1) shows the little battery charging symbol quite happily - and that's with all 5 USB ports in use. My iMac (11,3) does the same.



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iPad Charging
Authored by: JPry on Feb 04, '11 09:02:04AM

Unfortunately, I do not remember exactly where I saw it, but I do recall this being reported on soon after the iPad was released. What actually happens is that the iPad will not charge when the display is turned on. So, every time you unlock the screen for any reason, or are able to see the screen, you will always see "Not Charging" (as long as you're not connected to a high enough power USB port). As long as the display is off, the iPad will actually charge, albeit not as quickly as with a high power USB or with the wall charger.

Still, it's good info for those who were not aware of it before.



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iPad Charging
Authored by: arizdave on Feb 04, '11 01:10:36PM

Here’s an interesting WTF

I have a newer 27” iMac and the HD partitioned with Mac OS 10.6.6 & the other partition with Windows 7 / bootcamp. The iPad (plugged into any USB port) ALWAYS shows “charging” the iPad on the Mac side no mather what program - including itunes sync, sleep/wake et al. But when I restart into the “Windows 7” still plugged into the same USB port the iPad ALWAY show as “NOT CHARGING”. go figure ???



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iPad Charging
Authored by: boxcarl on Feb 07, '11 11:36:23PM

The reason is that Windows doesn't understand it when the iPad sends a message to the computer saying, "Hey, I can use more than the standard amount of voltage in my USB port." Mac OS X does. It's nothing surprising when you consider that normally the voltage that high wouldn't be sent to a USB port for fear of frying the peripheral attached.



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iPad Charging
Authored by: Macsterguy on Feb 04, '11 10:04:30AM

Isn't the front usb port (nearest you) a higher powered port capable of charging on Mac laptops?



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Works on Zeppelin
Authored by: wgscott on Feb 04, '11 11:52:54AM

I also found my Bowers and Wilkins Zeppelin will both play and charge my iPad, even though it does not say it is charging.



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iPad Charging
Authored by: Westside guy on Feb 04, '11 01:22:52PM

This is only true with older Macs - newer Macs can push more power (more than the USB spec mandates, actually) out through their USB port. If I plug my daughter's iPad into my 2009 MacBook Air, for example, even during use it shows that it is charging.

The basic issue is that most powered USB ports - even on a computer - will only provide 500mA of current. The iPad needs roughly twice that if you want to both use it and charge it at the same time.

Edited on Feb 04, '11 01:23:15PM by Westside guy



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iPad Charging
Authored by: Superboy on Feb 04, '11 05:35:29PM

iPads will charge slowly when attached to a normal "full power" USB socket, such as those found on most PCs and pre-2009 Macs, as long as its display is off. Almost all Macs from 2007 and beyond will charge an iPad relatively quickly, as they have what's known as a "high power" USB sockets. Most Macs from 2007 to present can supply one high power socket. However, some portables have two high power sockets, and the Mac mini can supply three high power USB devices, along with the 27" Apple LED Display. The high power sockets on the LED Display also work if the host Mac has no high power sockets itself. The same goes for iPhones too, they will charge much more quickly when attached to a high power USB socket.

If you go to the USB section in System Profiler, high power devices attached to a high power socket will display "Extra Operating Current (mA): 500". High power sockets can supply 5.5 watts, normal sockets can supply 2.5 watts. The iPad wall charger can supply 10 watts, making it the best one to use if you're in a rush. It's a shame Apple didn't keep Firewire, even if it was only for charging. Firewire can supply up to 60 watts!

Edited on Feb 04, '11 05:55:41PM by Superboy



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iPad Charging
Authored by: dgerrity on Feb 04, '11 05:51:51PM

Uggh, I just went through this. For some reason my iPad not only started reporting that it wasn't charging when attached to either USB port on my MacBook Pro, but it refused to shutdown when plugged in and took forever to recharge. A restore fixed the problem and I no longer see the not charging message anywhere, including my MacBook Pro.



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iPad Charging
Authored by: stepwallace on Feb 05, '11 12:46:18AM

“When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge, but only when it's in sleep mode.”
-- http://support.apple.com/kb/HT4060

That's correct, the iPad will charge from a normal USB port, but only while the iPad is asleep. The support article points out (as many have mentioned) that newer Macs can charge the iPad while it's in use.

Edited on Feb 05, '11 12:48:00AM by stepwallace



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iPad Charging
Authored by: cch on Feb 05, '11 11:44:26AM

I have the same problem on my current generation iMac. The weird thing is, it only started a couple of weeks ago. For months it was fine. Every other device charges just fine. Reboots of the iMac and iPad don't fix it.



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iPad Charging
Authored by: arizdave on Feb 07, '11 10:57:50AM

Here’s an interesting WTF

I have a newer 27” iMac and the HD partitioned with Mac OS 10.6.6 & the other partition with Windows 7 / bootcamp. The iPad (plugged into any USB port) ALWAYS shows “charging” the iPad on the Mac side no mather what program - including itunes sync, sleep/wake et al. But when I restart into the “Windows 7” still plugged into the same USB port the iPad ALWAY show as “NOT CHARGING”. go figure ???



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iPad Charging
Authored by: Superboy on Feb 14, '11 06:38:56PM

That's probably because Windoze doesnt "know" about high power ports. It just sees the ports as standard USB, thus supplying the normal maximum of 500ma. I do get the ports on my 27" Apple LED display supplying high power under Windoze 7 however, and my iPad displays "charging". Go figure :P



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