The Battery Life

Light Web Browsing

Here we're simply listing to MP3s in iTunes on repeat while browsing through a series of webpages with no flash on them. Each page forwards on to the next in the series after 20 seconds.

The display is kept at 50% brightness, all screen savers are disabled, but the hard drive is allowed to go to sleep if there's no disk activity. The wireless connection is enabled and connected to a local access point less than 20 feet away. This test represents the longest battery life you can achieve on the platform while doing minimal work. The results here are comparable to what you'd see typing a document in TextEdit or reading documents.

Light Web Browsing Battery Life

As glorified typewriters, you can’t beat the battery life offered by the MacBook Air. Light web browsing, document creation and music playback have minimal impact on the Air’s battery life. In fact, we actually beat Apple’s battery life claims in our light tests. The 11-inch Air delivers nearly 7 hours on a single charge and the 13-inch managed 11.2 hours. For a writer, you can’t do better than this.

Flash Web Browsing

The test here has three Safari windows open, each browsing a set of web pages with between 1 - 4 animated flash ads per page, at the same time. Each page forwards onto the next after about 20 seconds.

As always, the display is set to 50% brightness, audio at two bars, screensaver disabled and the hard drive is allowed to go to sleep if idle. The wireless connection is enabled and connected to a local access point less than 20 feet away.

Flash Web Browsing Battery Life

If you use the MacBook Air as a full function P...err Mac, the battery life drops steadily. In our Flash web browsing test battery life dropped to 4 - 5 hours depending on which Air you’re looking at. And the difference between the two isn’t all that great. The 13-inch only managed an extra 30 minutes of battery life.

Multitasking Battery Life

Our final battery life test is the worst case scenario. In this test we have three open Safari windows, each browsing a set of web pages with between 1 - 4 flash ads per page, at the same time. We're also playing an XviD video in a window all while downloading files from a server at 500KB/s.

Multitasking Battery Life

Our heavy multitasking test is the biggest issue. Neither MacBook Air was able to deliver more than 3 hours of battery life on a single charge. The problem here isn’t just battery capacity but also the performance of the CPUs themselves. A major component of long lasting mobile battery life is a concept known as rush to idle.

Let’s say we have two CPUs. The first is an ultra low power CPU that only consumes 10W under load, but 0.5W at idle. The second is a high performance CPU that consumes 40W under load and 1W at idle. If it takes the first CPU 5ms to decode a frame of video at 10W but the second CPU can do it in 1ms, the total energy consumed over 33ms is is 0.064J for the first CPU and only 0.036J for the second CPU.

The longer the first CPU is idle, the more its typical and idle power advantages will come into play (hence the results in the light web browsing test). The more CPU bound the workload however, the more the advantage over the second more high performance CPU will disappear. Our heavy downloading/multitasking test is the most CPU bound of all of our battery life tests and the workload is consistent regardless of how fast you execute it. In other words, a faster CPU won’t be able to do more work, it’ll just be able to rush to idle quicker.

The battery life story boils down to your usage model, even more so than with the MacBook Pro. Light users are going to get wonderful battery life out of the new MacBook Air, particularly the 13-inch model. However, if you are the type of user who does a lot of multitasking or if you’re running particularly CPU intensive apps (e.g. Photoshop, iMovie, etc...) then these two notebooks will hardly last you. I suspect this is the distinction Apple is looking to make. If you’re a regular user, just playing around on Gmail and browsing the web then the MacBook Air is all you’ll need. If you are doing any work with your machine however, you’ll want to look towards the MacBook Pro.

Can You Be Productive With the 11-inch? The 11-inch as a Windows Notebook
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  • hmurchison - Tuesday, October 26, 2010 - link

    Other than build your own computer (which is overrated IMO) there's little you can do with your PC that I can't do with my Mac.

    Yup ...I have style which means that I do get "owned" by the finer things in life. I don't have a tacky 3rd rate Alienware like box sitting on my desk. I could easily program by installing the free Xcode IDE that comes on my disk and create apps if I so choose. With Unix underpinnings I can do terminal commands and geek out if I want to.

    I'm not a lowest bidder guy nor to I spend an inordinate amount of time tinkering. My time is precious and time is the one thing money ..or cheap PC cannot deliver.
  • StevoLincolnite - Tuesday, October 26, 2010 - link

    See... Everyone is different, everyone has different tastes.

    To me Apples products don't look all that attractive to myself, from a hardware or an aesthetics perspective.

    I like my big flashy case full of UV Cathodes and LEDs which highlight my impressive looking water cooling loops running from my crossfire setup and Core i7 which can be admired through the side window.
    Nothing Apple has ever made has actually "Impressed" me from any angle, not the Aesthetics, the hardware, none of it, hence they aren't for me and a reason why I have never owned an Apple product.
    My neighbor even modded his Laptop so that it was all made from a clear plastic, and that to has a bunch of nice looking LED's inside of it which lights up really well and does look impressive.
    These... I dunno, the look just doesn't do it for me.

    As for the touchpad... I use a keyboard to scroll down a webpage, I guess it's a habit from the days of Ball-Mice giving me hell, so I used a keyboard as much as possible.
  • martyrant - Wednesday, October 27, 2010 - link

    Please, just because Apple tells you you have style doesn't mean you do.

    Again, you got owned by advertising, and you probably look like a giant douche or a turd sandwich when you walk around, all the while thinking in your head you are the sh*t!
  • synaesthetic - Wednesday, October 27, 2010 - link

    play games? *cough*

    no, bootcamping Windows does not count.
  • captainBOB - Wednesday, October 27, 2010 - link

    Its called Steam for the Mac

    Its also called TF2, HL2, HL2: Ep 1 and 2, Portal, Left for Dead 2, HL2: Deathmatch, Starcraft 2, Diablo 3 (when it arrives) WoW, City of Heroes: Going Rouge, Day of Defeat, CS: Source, EVE Online, Civilization IV.... they don't look like indie games.... should I keep going?

    Sure its not quite the library that Windows based PCs have, but the argument that Macs can't play games was dead in the water when Valve brought Steam to the Mac.

    Oh and no, It can't play Crysis.
  • MikosNZ - Wednesday, October 27, 2010 - link

    Most of those games are old and you will note they are only AAA titles. Yes you are right a handful of the most popular games come to OSX. But the vast majority do not.

    Apple and Apple OSX are a nice platform but they most certainly are not a serious gaming platform. Fine for the hobbyist gamer not anyone who spends a significant time gaming.
  • captainBOB - Wednesday, October 27, 2010 - link

    Yep, I mention the big AAA games because they aren't so quickly dismissed as say, "Torchlight" or the other nice indie games on Steam available for both platforms.

    Definitely a Mac a gaming machine does not make. Just wanted to clear up a misconception that Macs cannot play games. Better to jump into the Hundred Years flame war prepared.
  • solgae1784 - Tuesday, October 26, 2010 - link

    Display is still one of Apple notebook/laptop strengths.....11 inch Air has the same res (1366x768) as most manufacturers use in 15 inch display and some of the 13 inch displays. 13 inch Air has the same res as the Macbook Pro 15 inch model (1400x900), which also puts most other manufacturer's 15 inch display notebooks/laptops to shame with its paltry 1366x768 res. When will those other manufacturers learn that 768p (or heaven forbid, 800p) on a 15 inch screen is just not large enough?

    I have also yet to saw a single touchpad that can at least match Apple notebook/laptop's implementation. Scrolling is just plain frustrating (especially horizontal scrolling) on those touchpads.
  • Accord99 - Wednesday, October 27, 2010 - link

    "When will those other manufacturers learn that 768p (or heaven forbid, 800p) on a 15 inch screen is just not large enough?"

    It's a good thing other manufacturers offer products that use higher resolutions like 1920x1080 or 1920x1200, something not available on a Mac except at 17".
  • solgae1784 - Wednesday, October 27, 2010 - link

    I checked just now on Dell/HP/ASUS/Lenovo 15" notebook and apart from Alienware notebooks, none of them offered anything but a 768p res. Dell used to offer a 900p res on their XPS 15" line, but that option is gone as of now. I don't recall any notebook/laptops apart from Alienware that offered a 1080p or 1200p res on a 15" screen notebook.

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