Hmm, one thing I can't find an answer to, but which ought to be obvious to anyone seeing one "in the flesh", is whether the battery is internal, or can be changed without dismantling it? That's one of the things I like least about the MacBook Air, that to make it very small, they've made the battery non-user replaceable which means (i) You can't carry a spare battery & (ii) It's an expensive return to Apple replacement.