Battery Life: The Downside

Despite having an integrated 42 Wh battery (similar in size to the 3rd and 4th gen iPads with Retina Display), battery life is a real sore spot for Surface Pro. Haswell is really designed to drive platform power down to very low levels, which should help close the gap between ARM/Atom based tablets and Core based tablets. Unfortunately, Haswell for tablets won’t hit until the third quarter of this year, which forced Microsoft to use Ivy Bridge.

In our tablet benchmarks, I never saw Surface Pro break the 6 hour mark on a single charge. In most cases I’d expect to see 5 - 6 hours out of Surface Pro in light, tablet usage. Video playback was especially disappointing as Surface Pro managed to use more power here than during our web browsing battery life test. I suspect this might have to do with the relative power efficiency of Ivy Bridge's video decoder. It'll be interesting to see how Haswell does in this department.

Web Browsing Battery Life

Video Playback - H.264 720p High Profile (4Mbps)

I also put Surface Pro through some of our new notebook battery life tests for 2013, and here it didn’t fare too bad. I only have Acer’s 13-inch S7 to compare to but Microsoft managed 3.85 hours in our medium workload compared to sub-3 hours for the larger Ultrabook:

Windows 8 Notebook Battery Tests
Battery Test Acer Aspire S7 (13-inch) Microsoft Surface Pro
AnandTech 2013 Light 4.00 hours 5.2 hours
AnandTech 2013 Medium 2.88 hours 3.85 hours

This is easily the biggest disappointment with Surface Pro. You just won’t get the all day battery life you do with an ARM based tablet out of this design. I expect Microsoft will have a solution to this problem with Haswell, but not until the end of the year.

Charging

Surface Pro retains the same large, magnetic power connector as Surface RT. In fact, Surface RT’s power adapter will still charge Surface Pro. The Pro model does however come with its own 48W adapter. It’s a nice looking, but large and still fairly traditional two piece power supply (brick + detachable wall cable). There’s no sophisticated cable management other than a tiny hook to help keep the device end of the cable together. One neat feature is the power adapter does feature an integrated USB port for charging your smartphone.

Under max charging load the power supply will draw around 27W at the wall. Microsoft included a 48W unit in order to be able to charge and power the device without slowing down charge time. It took me 2.692 hours to charge Surface Pro from completely empty to 100% with no additional power draw at the wall. The quick charge time is pretty nice and about the only reprieve here when talking about Surface Pro's battery.

I did notice something odd with the first power supply Microsoft sent me. When charging through my power meter, I picked up some interference in the capacitive touch screen itself resulting in around 10% of my taps not being recognized. Microsoft supplied another power supply that seemed to resolve the issue.

Display: Awesome if Calibrated Final Words
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  • maximumGPU - Wednesday, February 6, 2013 - link

    it might not be the best of both worlds but for a lot of poeple it beats carrying a laptop AND a tablet.
  • LetsGo - Wednesday, February 6, 2013 - link

    But you can't use it in your Lap so its rubbish as a laptop, and you can't use it as a tablet because its too heavy. so really its a portable desktop replacement with a digitizer.
  • amdwilliam1985 - Wednesday, February 6, 2013 - link

    It really depends on your point of view, what you see as shortcoming is exactly opposite of what I have in mind. I guess everyone has different needs, and NO one size fits all, of course unless you're iSheep, then one size does fit all.

    Anyway, I would love to give up my Samsung Galaxy S3(4.8" screen) and Google Nexus 7(7" screen) for the upcoming Galaxy Note 3(rumored 6.3" screen).
    *YES, I will be holding it next to my face to make phone calls, I'm already doing it on my Nexus 7 with wifi-calling.
    *YES, I can do it next to those iTiny with 3.5" or 4.0", so they can laugh at me, or I can laugh at them, lol.
    *YES, I am able to fit it into my pocket, I am currently carrying both S3 and N7 in my pockets.
    *NO, I do not have oversize pockets, they can easily fit into my work trouser and my jeans.
    *NO, I do not care about your opinion of me.
    *YES, I believe you over care about what other people thinks.

    "It's amazing that some people will do anything to 'fit in' while others will do everything to 'fit out'". -some "wise" guy
  • beginner99 - Wednesday, February 6, 2013 - link

    Considering the hardware the price makes sense but it just feels too expensive. For $999 I expect the full type cover at least.

    The best thing about this is the USB port on the power brick. So you can live with 1 charger and leave the one for smartphone, eReader and other gadgets at home like when you go on vacation.
  • Jaerba - Wednesday, February 6, 2013 - link

    Thanks for the great review, Anand. It confirmed my worries about the battery life and kickstand/lap usability, so I'm wondering if there's a possible battery keyboard dock on the horizon, like the Helix or Transformer Prime have. Can you even do power transfer through the magnetic clip?

    It seems like that one accessory would fix all of the major issues.
  • Byte - Wednesday, February 6, 2013 - link

    Been waiting for this since my compaq tc1000. awesome screen, but one q, is it big enough to be able to play starcrft2? Not sur ehow ivy handles sc2 but I'm hoping haswell will be able to handle it.
  • althaz - Wednesday, February 6, 2013 - link

    Yes it plays Starcraft 2. I have played SC2 on identical hardware and it works fairly well, obviously you'll not be playing on High or Ultra settings.

    This is one of the reasons I'm picking one up as soon as is humanly possible. Portable Starcraft machine? Check. Football Mananger PC on the train? Check. Angry Birds/web-browsing from the couch? Check. Can run visual studio and photo shop? Check.

    Winner! (I don't care about battery life past 2-3 hours and find the weight quite acceptable, ymmv).
  • tdtran1025 - Wednesday, February 6, 2013 - link

    So it's the fastest tablet out there, but for what? RT is sluggish, Windows 8 did not take off like MS expected it to, what else is there? Maybe XBox 720 will rescue MS.
  • amdwilliam1985 - Wednesday, February 6, 2013 - link

    RT will be fine when they get tegra 4 or Snapdragon S4 pro in the next iteration along with more apps.

    Windows 8 is doing just fine, they're having decent market shares, I also bought a copy for my 5 years old (athlon x2 @ 2.5ghz) and it works great :)
    I do plan on getting that awesome Lenovo Yoga to take full advantage of touch.

    MS has more than xbox, they have the heart of business world.

    The world can live on if suddenly facebook or Apple cease to exist, but the world will crumble if Google or MS falls. Just my 2 cents, probably why Apple(fashion) stocks UPs and DOWNs like crazy, because it can easily be replaced.
    Simple test here, imagine tomorrow morning if your iphone/ipad/ipod ceased to exist, huh, just pick up some other replacements. Now imagine, tomorrow windows ceased to exist, lol, god forbid.
  • duploxxx - Wednesday, February 6, 2013 - link

    Scrolling in web pages, application install time, file copy time, everything is just significantly faster on Surface Pro than on any competing tablet. Oh, and it boots (from full power off) in less than 10 seconds. It’s really the combination of the great CPU performance and fast SSD that deliver the responsiveness of the Surface Pro.

    cpu performance that's all nice, questionable if it is really needed vs the reduced battery life, you get, higher cost, weight and size. but anyhow.

    NO GPU performance benchmarks? Is it really usable with the downscaled GPU ghz, typical issues with even general adobe flash games crashing with these kind of gpu, afterall that is where some of these tablets end up, a kid playing on internet games....

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