iOS6.02 may have problems for iPad mini and iPHONE5.
iOS 6.0.2 Is Killing iPhone 5, iPad Mini Battery Life | Cult of Mac
"Apple released its iOS 6.0.2 update over-the-air to select devices earlier this week, promising a fix for a frustrating bug that could impact Wi-Fi performance. However, the update comes with a nasty problem of its own. There are reports that it has greatly reduced battery life on the iPhone 5 and the iPad mini — even when the devices go unused for long periods of time."