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Apple’s VP of iPad Marketing explains how the iPad charging system works
“That circuitry is designed so you can keep your device plugged in as long as you would like,” Tchao said. “It’s a great feature that’s always been in iOS.”
Ina Fried at AllThingsD went on further to explain:
Apple does, in fact, display the iPad (and iPhone and iPod Touch) as 100 percent charged just before a device reaches a completely charged state. At that point, it will continue charging to 100 percent, then discharge a bit and charge back up to 100 percent, repeating that process until the device is unplugged.
Doing so allows devices to maintain an optimum charge, Apple VP Michael Tchao toldAllThingsD today.
Until extensive and comprehensive testing can be conducted, it looks like we will have to take Apple’s word for it, but hopefully that explanation will put current and future iPad owners at ease for now.