Apple's iPad 3 is only 90% charged when it says its 100% charged up.
Raymond Soneira, president of DisplayMate, found while testing the iPad 3's display, "that the batteries do not actually reach full charge when 100% is shown and need up to an extra hour before the charging is done."
After further investigation, Soneira discovered, "when the battery indicator first says 100% the battery is actually only 90% charged and you get 1.2 hours less running time."