FYI for those trying to quantify life expectancy. I've had the iPad 2 since the spring of 2011 and its still going. Battery seems fine, the only issue I have is that it is weaker in picking up WiFi signals than the newer iPads. It is still used everyday for video streaming for hours on end (plugged in). The reason I posted this is because I was trying to find the same sort of info for the iPad Air and Air 2 but couldn't find any "official" numbers on the matter. I manage a fleet of them so I will post any findings.