I haven't done any scientific testing--I leave that to all the other geek-out (in a good way) sites--but it seems my MacBook Air can run for hours, easily matching the 5-hour claim by Apple for "wireless productivity." And that's mainly what I use it for: I leave on my WI-FI at all times, and am surfing the web and writing. I'm sure without an optical drive and barely a port to draw power on have something to do with it, and perhaps my SSD model adds a notch to battery life. Either way, it runs circles around all my previous notebooks, some twice as long, I'm betting.
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