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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  • Mumrik - Tuesday, October 23, 2012 - link

    As someone who picked up a 32GB HP Touchpad for $149 and slapped ICS on it via CyanogenMod, I still don't understand the appeal of this kind of tablet.

    To me, it physically looks absolute great, and blows any iPad out of the waters (but, to be fair, I never liked Apple's designs), but I still don't know why one would buy a $5-600 high end tablet. Why not a compact laptop at that point? We're clearly far beyond a few mobile games, youtube/720P videos and ebooks. Don't tablets make more sense at the lower end?

    For $149, I've gotten a hell of a lot out of my tablet, but these are on the edge of ThinkPad X-series territory.
  • Zink - Tuesday, October 23, 2012 - link

    That was a fire sale for way bellow cost so it doesn't really apply to current pricing.

    Tablets don't replace portable laptops, just another option. Both have their trade offs and fit different users, for example my Mom. Many users also have a tablet in addition to a laptop.

    Tablets offer multi-touch for games and relaxed use, battery life, portability, simplicity, and screen quality to name a few benefits.
  • Mumrik - Wednesday, October 24, 2012 - link

    The firesale was part of my point, but that general price bracket also now exists as a regular part of the tablet market.

    The things you mention at the end are what I see them do as well, but where does the 500+ dollar tablet fit into that? Unless you want some ultra high definition on that screen, those needs are filled quite well by cheaper tablets.
  • PubFiction - Wednesday, October 24, 2012 - link

    I would agree with you but at $499 or higher apple is moving millions of tablets so clearly other people do not seem to think that way. Your comments are basically neither here no there. The usefulness of slate tablets is a side arguement, I do not own them as you said because I would rather just have a real functional laptop. But part of the greatness of windows 8 is that it will finally push vendors to not so much jump into the tablet market but actually functionally merge the laptop and the laptop to a point where they become one device and no one needs to make a decision about one or the other or carry both.
  • shompa - Wednesday, October 24, 2012 - link

    Do you really think its a mass market to hack tablets?

    This is a product for non-nerds and Office.

    (Hint: When you get older you will stop caring about hacking stuff. You want thing just to work. After working 8 hour with computers you want to come home to a computer setup that works. Including that all you family and friends have working stuff since you are support 24/7 for them. Many IT professionals like me solves this by just buying a bunch of macs and hand them out. "now it works. Don't call me for support".
    Building you own PCs are meaningless. You have 1000 dollar extra to buy an Alienware. You also will be interested in pussy. Beautiful designed stuff (like Apple stuff) attracts pussy. And I like pussy even if I am married. (*hint2* never get married). Hacking stuff is a pussy repellant. If they see a home built PC or strange Tablet with strange OS. *poof* pussy gone.
  • blandge - Wednesday, October 24, 2012 - link

    This may be the dumbest thing I've seen somebody say on the internet. Specifically the last paragraph.
  • superflex - Wednesday, October 24, 2012 - link

    Or the most brilliant.
    I concur with the OP. Who has time to fuck with flashing ROMs and installing modded OS's. Would you rather OC your CPU and memory with a new BIOS or be hitting some strange?
    I've built plenty of PCs but now the last thing I want to do is go home and fuck around with making sure my OC temps are stable or I have the highest benchmark score.
    Get a life dude. Pussy rules!
  • kyuu - Thursday, October 25, 2012 - link

    Yeah, because women just love the sort of person who says "pussy" repeatedly. In the comments of an article on a tech blog.

    Seriously, if you don't like tech, then what the hell are you doing here? Go annoy some people on some pussy blog somewhere.
  • Stas - Monday, November 5, 2012 - link

    You sound like you didn't get out of your mom's basement until you hit 21 when your friends eventually got you out to a bar. They hooked you up with a drunk broad so you can finally lose your virginity. Now you're a self-proclaimed frat bro with mad game.
    Hint: normal, developed adult males don't act like a 12-y.o. girl getting the new Justin Beiber CD at the sight of a frisky female. "Pussy" is just something that happens, they get it like they get their coffee in the morning - it's a normal occurrence or even convenience. Remember how, a couple of years ago - in high school, you couldn't stop bragged in class about your dad's sick new Mustang? Well, it's not like that. Bigger things excite grown-ass men - hobbies, jobs they love, personal projects... shit, even politics. And to some, computers and electronics are one of those things.
    But, anyways, you'll get it. Eventually.
  • kozlowski - Tuesday, October 23, 2012 - link

    Anand, do you know if Microsoft organically grew the hardware unit that built Surface, or did they buy a hardware team and integrate it into MS?

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