I've purchased an iPad Air 2 last week and it came with iOS 8.1.3. I haven't updated to iOS 8.3 yet because based on most of what I read online, it's drains the battery a lot. Since the last full charge it lasted less than 8 hours! And I do not listen to music or watch videos on it. I only use iBook, google something every once in awhile and check my emails occasionally. I'm pretty frustrated and I'm almost returning it. I'd love to know about your guy's experiences. Should I update to iOS 8.3? I'm considering installing iOS 9 on the iPad Air 2 because of the great results I'm witnessing after installing the Beta on my iPad 4, but then again, both my iPad 4s have always been great like that, the one still running iOS 6 is THE best. I've only spent five days with the Air and I wonder if it's an iOS problem or the device that is a piec of sh*t! I deeply appreciate any input.