Battery Life

Surface features an integrated 31 Wh battery, which is larger than what’s in the iPad 2 but smaller than what Apple used for the iPad 3.  Charging duties are handled via a 24W power adapter with a custom magnetic connector.

Of all of the aspects of Surface, the charging connector feels like the least well executed. For starters, the connector is quite long – about twice the length of a MagSafe connector. Secondly, the magnets in the connector aren’t all that strong so the attraction to Surface isn’t very confidence inspiring. The third issue is alignment. Because of the 22-degree beveled edge on Surface, you have to approach mating the power connector to the tablet very carefully. More often than not I’d have the connector match up but not fully connect. It usually required a few minor adjustments to get the connector to actually start charging. My final complaint is about the power indicator LED on the connector itself. The LED only glows white and gives no indication of whether or not the device is done charging. Furthermore, it doesn’t even glow all that bright, making it hard to tell in daylight whether the device is even getting power. I’m pleased with virtually all aspects of Surface’s physical design, but the charging port and connector need to be redone for the next generation.

The power adapter itself is larger than the 10 – 15W units you get with most tablets in this price range, but it is also a considerably larger power supply. You can take Surface from completely empty to fully charged in a little over 3 hours hours. You can also get Surface up to 50% power, while using the device, after just over an hour of being plugged in. Microsoft wanted to prioritize real world productivity scenarios where you had a limited amount of time to charge but also needed to use the device. The larger power adapter and not gigantic battery were the right balance to meet those needs.

The power brick features a Windows RT logo, but is otherwise clean. The surface of the adapter is a nice soft touch plastic. The two prongs for US models stow away neatly in the adapter. The power cable is nice and long at around 1.5m. There’s no built in cable management other than a little U to keep the connector attached to the end of the cable.

To measure battery life I put Surface through our 2012 tablet battery life suite. All tests were run with the display calibrated to 200 nits and with Surface, its Touch Cover was attached.

Overall battery life is pretty competitive with the iPad. In lighter use cases Apple pulls ahead slightly, but if you look at our updated web browsing test the heavier CPU load pushes Surface ahead of the third gen iPad. It’s not clear how the 4th gen iPad would stack up in this comparison.

Video playback is also decent for Surface, although Apple manages to pull ahead with the win there as well. The bigger accomplishment is that we’re seeing a Windows device with battery life that’s comparable to other tablets running mobile OSes designed from the ground up.

Microsoft has the right OS platform to be competitive in this space. With some more power efficient hardware I could see a future iteration of Surface moving its way up these charts.

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  • Krysto - Wednesday, October 24, 2012 - link

    So their (real) excuse for using a lower resolution is that they didn't use a more powerful chip? Ok, but the problem remains that they're using a chip that can go in $200 tablets as well, a lower resolution display, and also a much smaller battery than the iPad, and yet it still costs $500.

    The extra storage is irrelevant, since they need that for cover for the greater size of Windows and Office, and they shouldn't make the user pay for it. Also how do they explain the fact that Google will use a much more powerful chip (Exynos 5 Dual) and a much higher resolution (2560x1600) in their upcoming Nexus 10 tablet, and yet will still cost $500 or less?
  • phexac - Wednesday, October 24, 2012 - link

    Yeah the more comments like this I read, the more I realize that I was too generous in my post below. Surface seems destined to be a crap release and Anand did a terrible job at presenting an honest review of it.
  • shompa - Wednesday, October 24, 2012 - link

    Is WindowsRT sandboxed?
    If the OS is sandboxed: how do apps access the microSD slot?

    I have seen many Windows Phone/Androids that have to reformat the system and reinstall everything to get the apps to "see" the microSD.

    Can you install apps to the microSD?
  • scorpian007 - Wednesday, October 24, 2012 - link

    You can't install apps to the microSD card, it's only for media (photos, videos, music).
  • phexac - Wednesday, October 24, 2012 - link

    This really seems to me like a tablety take on the netbook, and those turned out to be underpowered pieces of crap. MS looks to be going down the same road with an OS that tries to be like a desktop OS, but that can't really run all the OS programs. When it tries to run Office, it starts choking.

    We have no retina display.

    App launch times are horrid for a tablet.

    I really don't see the point of this device. If I am going to type or actually produce something, I am going to do iton my macbook air. If I want a tablet, I really don't care about a crappy attachable keyboard for $130+. If you say well I want a cheap laptop, well then you are back to the netbook argument, except the Surface is 2x or more the price, in the same price range as most fully-featured laptops, except it actually doesn't even have a fully functional desktop OS. This is a device typical of Microsoft, which never seems to think about how people will use the device and what they will want to use it for. They come up with a device that tries to straddle the fence on everything, and as a result ends up doing everything shitty (and with a shit screen, given the retina display and other displays following it being out there). Reading this review leads me to see complete and utter failure for MS in this device. And this is the reason they are making Windows 8 into an abomination? Pretty sad honestly, though not really unexpected.
  • N4g4rok - Wednesday, October 24, 2012 - link

    "App launch times are horrid for a tablet."

    There weren't any numbers relating to App launch time. He made a statement about them being a little longer than he expected. How does that equate to 'horrid'?
  • andrewaggb - Wednesday, October 24, 2012 - link

    he also said switching once they are 'open' is really fast, so this might be ok.
  • TheBasicMind - Wednesday, October 24, 2012 - link

    I think Microsoft really have something. Though I did wince reading you tried to adjust trackpad scrolling by resorting to the registry. I see the registry and access to it as part of a MS mindset that is not about openness or any positive philosophy (like LINUX), but instead about fear of having missed something. It opens up an untestable number of configurations a world of potential system problems and pain. I've not missed it in any way shape or form since moving my computing away from MS. And it is part if a computing past I have actively and willingly left behind. This is the company where still in Word, after several generations of releases, if you leave the document map open while editing cross references, you are guaranteed to have a badly corrupt document within 2 hours of working on it (GUARANTEED). How many combined years of user pain does that represent?.The only explanation for this fundamental lack of quality control is that it became like a messy room, which when mess was left long enough, just became a part of the background (I did abandon after Vista and have heard from many sources Windows 7 was a big improvement). I know other OS's have their problems (though in my experience, nothing like MS's offerings) I'm sure Surface is different (it has to be for the sake of MS). I think it may well hit the right spots for me. However over the years, the MS brand has become a kind if giant anti-brand for me and MS have to overcome that as well. They have a very high mountain to climb. So for me it will be surface 2, if and only if Surface 1 is a roaring success.
  • Jxpto - Wednesday, October 24, 2012 - link

    "Switching between applications is faster on Surface/Windows RT than any competing mobile platform. There’s no double tapping of anything, no pressing and holding, just an edge gesture swipe like you’re flipping through pages of a virtual book".

    That's not accurate at all... You don't even need to move your hand to the edge to switch between apps in the iPad. It's just a 4 finger gesture... And also just a four finger gesture to bring the task switcher... Or a not her gesture to go to the home screen. So in what is the Surface better regarding this??
  • turnipmaster - Wednesday, October 24, 2012 - link

    Firstly, out of 32GB, the OS require at least 10GB+, so we know that this is no lightweight solution.
    The load times seem outrageous, my trusty Lumia 710, after a reboot, loads the Nokia maps app in ~2 seconds, this on an old Arm A8 based SoC. My Nexus 7, has the same Tegra 3 as the Surface as is damn sight faster at opening apps.

    The wisdom of a psuedo facsimile of Windows 8, that can't run legacy / x86 apps yet obviously brings additional performance demands over a mobile focused OS, like WP8 is lost on me. If MS knew this, why didn't it chose a higher spec SoC, they haven't even used the fastest Tegra 3, the T33 would have been a nice boost over a regular Tegra 3.

    I personally think WP8 could have been tweaked to be awesome on the surface, but Microsoft intended to use it to push their weird vision of Windows 8 RT. It is a shame that performance detracts from a cool device with a lot of potential, especially as Apple has blind-sided them, with a big boost to the iPad's performance with the A6X.

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