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.

Camera Performance
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  • enealDC - Tuesday, October 23, 2012 - link

    Any takers?? Reply
  • MonkeyPaw - Tuesday, October 23, 2012 - link

    Early adopter = heartburn. Reply
  • daar - Tuesday, October 23, 2012 - link

    Been using an Thinkpad X41 tablet for ages at work, will probably pick this up to replace it. I mean, this thing does have pen input yes? I didn't see much mention of it in the review. Missing a few benchmarks as well, which is kind of a shame as the Surface is the one of the most interesting computing device put out in the last while.

    Also would like to ask who makes the actual panel? I recall AT used to note this in reviews in the past but not as of late, I don't think I even saw mention of it in the iphone 5 review.
    Reply
  • gardocki - Wednesday, October 24, 2012 - link

    No pen input on the Surface RT, just on the Surface for Win 8 Pro, which will likely be about twice the cost and won't be released for another 90 days Reply
  • gcoupe - Wednesday, October 24, 2012 - link

    I don't think this is correct. If you look at the "Help me choose" document published by Microsoft, then they state that "Capacitive pens available for purchase".

    True, these aren't active pens, with pressure sensitivity, but as far as I'm aware, WinRT will have handwriting recognition.

    It would be good to get some confirmation of this though, and a measure of whether it is as good as the handwriting recognition in Windows 8.
    Reply
  • This Guy - Wednesday, October 24, 2012 - link

    All capacitive touch screens work with capacitive pens. In my experience capacitive pens write like crayons.

    Running an older tablet with a worse input array I have perceived capacitive hand writting recognition on win 8 as being quicker and more accurate compared to win 7. That said, I still find it painfully slow compared to the on-screen keyboard.

    So yes, Surface RT supports capacitive pens, but the experience of capacitive pens is generally so poor on other devices most people don't consider them as pen inputs.
    Reply
  • nagi603 - Wednesday, October 24, 2012 - link

    Capacitive pen compared to an active pen is like comparing a baby tricycle and a jet airplane. Not even in the same league. But unless you have tried something remotely like the latter, you won't even know that.

    Trust me as someone who has actually tried both and has been using a wacom pen for years: throw that capacitive pen out the window!
    Reply
  • SleepyFE - Wednesday, October 24, 2012 - link

    Most interesting computing device?????

    It's just a small laptop with all it's guts stuck in a poorly cooled space behind the screen.
    Reply
  • owned66 - Thursday, October 25, 2012 - link

    ummm .... ?
    this is windows RT
    its using an ARM cpu
    Reply
  • SleepyFE - Thursday, October 25, 2012 - link

    I know it runs on ARM, does that not make it a laptop, is a server using ARM not a server?
    No matter how u spin it, it either a tablet (of which there are many and 99.9% use ARM) or it's a laptop with less power and less headroom (regarding cooling).
    Thankfully a week laptop is at least sort of useful, but paying 100$ extra to get the keyboard? No thanks!!
    Reply

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