Dr. Raymond M. Soneira, creator of DisplayMate and author of a new report about the third-generation iPad (he also hammered Apple for what he called marketing puffery with regard to the iPhone 4's "retina display"), says the device continues to charge well after iOS says that it's reached full battery capacity. Soneira made the statement in a report he called the "new iPad Display Technology Shoot-Out." He said,
"Note that the batteries do not actually reach full charge when 100% is shown and need up to an extra hour before the charging actually stops."
There's that "up to" statement, which means that the device "may" not need that long an overcharge to reach full capacity. Also, according to Soneira, Apple's new iPad is not the only device to fool users into thinking it's fully changed when it's not: they all do it, he said.