I see you are back to your old FUD tricks, Puget: misrepresentation.
Which MacBook Air is THAT you are referring to, Puget? The one this article is about? Or the one released ALMOST THREE YEARS AGO???
The fact is, Puget, and everyone reading his reply, contrary to what you want everyone to infer, Anandtech HAS NOT TESTED the batteries in the latest MacBook Air.
In addition, the Anandtech MacBook Air Battery article", which your link erroneously DOES NOT LINK TO, is the worst case scenario, doing tasks the MBA—intended for light usage—is REALLY not designed to do, I.E., simultaneous display of xVID video, heavy web browsing, and downloading large files with constant hard drive access.
"...downloading 10GB worth of files from the net (constant writes to the drive), browsing the web (same test as the first one) and watching the first two episodes of Firefly encoded in a 480p XviD format (Quicktime is set to loop the content until the system dies)...Anandtech found, instead, the following in it's tests:
Even Anandtech's mild usage test, was a bit on the heavy side, more than most average users use when using a laptop:
The wireless web browsing test uses the 802.11n connection to browse a series of 20 web pages varying in size, spending 20 seconds on each page (I timed how long it takes me to read a page on Digg and came up with 36 seconds; I standardized on 20 seconds for the test to make things a little more stressful). The test continues to loop all while playing MP3s in iTunes. This test is designed to simulate the intended usage of the MacBook Air: something you can carry around with you to class, work, on the train, etc... to comfortably and quickly browse the web, take notes and generally be productive all while listening to music.
It is my opinion that the average use does NOT spend four hours constantly moving from page to page at 20 second intervals downloading page after page over WIFI, and listening to MP3s all the while. This is purely an artificial creation. Using a more standard mode would get the five hours usage Apple predicted... as Anandtech states:
Apple's 5 hour claim is laughable but not as much as I expected. If I wanted to I suspect I could hit 5 hours by making the web browsing test less stressful, but my focus was on real world usage scenarios, not proving Apple correct. Regardless, 4 hours and 16 minutes doing what I consider to be the intended usage model of the Air is respectable. It's not great, but it's not terrible either.''
Which your toss off, mis-directed, out-dated criticism carefully ignores. The fact is that the MacBook Air's battery life, when released, was REMARKABLE for lightweight notebooks... and far exceeded other computers in it's class that offered full size keyboards.
YOUR misrepresentation here at 2.45 hours, is FUD, intended to make readers think that Apple lied about the 5 hours by more than 100% over the true time.
In actual fact, Puget, contrary to Anandtech's contrived stress test, many 2008 MacBook Air users, including other reviewers, reported getting clocked battery lives of over five hours... some approaching six hours.
What Anandtech's review has to do with an entirely NEW model with different batteries and different loads is irrelevant... and you know it.