With the upgrade to the new 2.0 iPhone operating software, the device seems to be eating power at a much faster rate. And that's with WiFi and Bluetooth turned off most of the time. So I find that if I don't plug the iPhone into its USB connector to the iMac in my study before going to bed, the thing will be nearly totally drained in the morning. That never used to be the case. So like Hal Jordan and his power ring, I need to get into the habit of recharging at least once every 24 hours. That way, he'll be an effective Green Lantern, and I'll have an iPhone that's ready to go in the morning.