Looking for feedback from other iPad Air 2 owners on their Battery Life. Recently upgraded from the iPad 2 , which would give me 2-3 days of moderate to heavy use before needing a charge. With the Air 2 I'm getting 1.5 to 2.5 days before charge time. I know that the battery is smaller in the Air 2 but Apple did boast the same usage times as previous generations. How has your experience been?