A few days ago I performed a simple battery test on my i7 13 2011 MBA. Display was at 4 bars from full, WiFi on but unused, playback of SD movies at full screen. The battery had already been cycled twice. When I first unplugged the power lead and started video playback the battery monitor show 4h 49m remaining. This proved to be a pretty good approximation; the computer actually turned itself off after 4h 40m. Im a bit disappointed with this. The processor remained at about 5%-7%, so it was hardly being used and yet my results are nowhere near the 7 hours that Apple advertises. I realise that the 7 hours can only be achieved with light usage but I feel that playing back a simple, non-HD video file with processor usage of 5%-7% IS light usage. Anyone have a similar experience? Incidentally, I have an LG display - which I must say is a LOT different from my previous Samsung display, colours are noticeably less vibrant.