iPad ‘Not Charging’ Via USB? Here’s Why And Your Options

News | Friday April 2 2010 1:33 PM | Comments (0) Tags: , , , ,

In a recently published blog post,
“We've tried charging our iPads in several places today. Here's what's worked and what hasn't.
Places where the iPad was able to charge (other than a wall outlet): Rear USB port on a 27-inch iMac desktop; USB port on a MacBook Pro laptop.
Here's where the iPad did not charge: Front and rear USB ports on a variety of Windows computers; USB port on an Apple wired keyboard attached to an iMac.”
“the issue is simply that the iPad has heftier charging requirements than iPods and iPhones, and some USB ports—especially those on older computers and most USB hubs—don’t provide enough power to charge the iPad during use. That doesn’t mean lower-power USB ports can’t charge the iPad at all; instead, whether they can charge the iPad’s battery—and how quickly—depends on how the iPad is being used.”
For the fastest charging, use the iPad’s included 10-Watt USB power adapter. This will fully charge the iPad in a few hours, even if you’re using the iPad at the same time.
When connected to a high-power USB port—such as the ones on recent Macs and the iPhone Power Adapter—the iPad will charge, even during use, but more slowly. (We haven’t yet determined how much more slowly.) Some third-party powered USB hubs provide higher-power USB ports, but many don’t; similarly, the USB ports on most Windows PCs don’t provide this additional power.
When connected to lower-power USB ports—those on older Macs, most Windows PCs, and most USB hubs (powered or unpowered)—the iPad’s battery is not charged while the iPad is awake, but is charged (again, slowly) when the iPad is asleep. What’s confusing here is that the message Not charging appears in the menu bar when the iPad is awake, which might lead you to assume that the offending USB port can never charge your iPad. But rest assured, Apple says: once you put the iPad to sleep, the battery will indeed charge. (If you could see the screen while the iPad was asleep, it might even display the charging icon. It’s the modern-day “Does the refrigerator light stay on when I close the door?” mystery.)
Let us know if it helps in the comments section below.
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