I went to Los Angeles for a job interview and stayed out there for three nights. I used my iPad 2 at the airports (pre-boarding) and on the flights (departure and arrival) and every day as much as I wanted, never attempting to conserve battery power in any way. I used WiFi at the hotel, 3G at the airports and watched a 45 minute TV episode and a 90 minute movie. When I got home I still had 10% battery remaining. I was just blown away it lasted so long. What a great product. That's it.