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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  • WCHS - Wednesday, February 6, 2013 - link

    Sorry Anand, this is not the only solution. The best solution to this question is Ipad Mini + Ultrabook. I hate it when companies try to combine two good things and end up with one bad one. I don't even notice my Mini being in my ultrabook bag. I get both - I get long battery life, ultimate portability, full applications access when I need it, and can even use both at the same time - for the almost the same price as Surface Pro + keyboard.
  • andrewaggb - Wednesday, February 6, 2013 - link

    but you have the downside of your data being split between multiple devices... you download your mail twice, your music twice, whatever it is you work on twice... or you do entirely different things on both so there is no overlap.

    Or you read an email on your tablet because it's more convenient (this happens to me all the time), but you need to respond and you need to type a fair amount and sometimes include files or content that's on your laptop. So you end up switching devices. Maybe it's just me, but this happens to me a lot.

    I'm not sure if surface pro is quite good enough yet, it's unclear to me whether it can drive two external monitors and I'd really rather have 256gb of internal storage. So maybe surface pro 2. I'd happily give up a separate laptop + tablet. Just like I happily gave up mp3 player + phone and often use my camera phone instead of my nice DSLR. Convenience will win in the end.
  • WCHS - Thursday, February 7, 2013 - link

    No, that is the point - you mostly do "different things" on the two devices. Even for the common things - at least they are possible. A Surface Pro will never be an ereader. The other point is that the Ipad Mini has shown that the sweet spot for a handheld tablet is "smaller, especially lighter " than an Ipad 2,3,4 - not heavier. Thats it - the Surface Pro is not "handheld".
  • andrewaggb - Thursday, February 7, 2013 - link

    Could be right. I'm certainly not unhappy with the size or weight of my ipad, but it also rarely leaves my house.

    I could take a 7" tablet with me easily... but I recently bough a galaxy note 2, which is another hybrid device, and I personally quite like it.

    I could see myself liking the surface pro for many of the same reasons I like the note 2. But it sounds like the current surface pro isn't quite there yet.
  • flyingpants1 - Wednesday, February 6, 2013 - link

    I'd like to see a roundup comparing Win8 i5 convertibles, namely the Surface Pro, the Samsung Ativ 700T, the Dell XPS 12 (the one that has a crazy swinging flippy hinge), the Lenovo Yoga 13, the Asus ones, Taichi and the others.

    All of these devices have severe drawbacks.
    The Surface pro is heavy and has no real keyboard or stand. The storage issue is a big joke. Probably the worst option of all.
    The Yoga 13 is large, heavy and the keyboard is exposed.
    The Dell XPS 12 is a slightly smaller Yoga and the keyboard isn't exposed on tablet mode.
    The Ativ 700T is my favourite so far. Too bad it has a poor connection between the screen and dock..

    I think each manufacturer should make a 10", 11", 13" of their tablets. IMHO 13.3" 1080p is more than enough to replace a 15.6".
  • faizoff - Wednesday, February 6, 2013 - link

    "The Surface pro is heavy and has no real keyboard or stand. The storage issue is a big joke. Probably the worst option of all."

    Just curious what is the big joke about storage? It's plainly listed what you're going to get and like any other windows OS you can experiment on your own to maximize space.
  • Doominated - Wednesday, February 6, 2013 - link

    Lol, if you think the Surface Pro has a "storage problem" you should try checking out some Yogapad setups. I've seen as little as 60 gigs partitioned to the C Drive out of the box.

    Sorry to break it to you, but the Surface Pro only has a storage space issue if you have absolutely no clue what you're doing with Windows. It takes all of 10 minutes to get yourself up to almost 100 GB of usable storage. Even more if you buy an mSDXC card.
  • Death666Angel - Wednesday, February 6, 2013 - link

    I liked the review overall. And I hope you make a video review for this as well. :D

    That said, I did notice some oddities.
    First, I find it strange that you compare this so much to ARM based tablets. To me, there is a mountain between those 2 kinds of devices. The comparison to Ultrabooks is much more apt. :)
    Secondly, the way you treat calibrated displays. You state:
    "Given that the majority of users don’t do any color calibration on their PCs, this becomes a real problem for consumer perception if your tablet doesn’t ship with accurate colors by default."
    All I have read on that issue is that our eyes are pretty good at adjusting to different color schemes. So unless you use one device that is calibrated exactly and one that is off, you will not notice a device being "wrong". So for most people, it is a non-issue. Then, you praise Apple for doing the calibration, which is fine because it is an extra service they provide (how much value it is to the standard customer is another matter). But what you don't say is that calibration is not eternal. At least everything I've read on the issue says that you have to calibrate displays every few weeks in order to ensure the continued accuracy of the results. Do tablet/laptop displays operate differently where they don't need recalibration down the road? Because if they do need recalibration, than that whole first calibration is looking much less desirable to me. If I need accurate colors, I have the necessary tools to get it myself. If I don't need it a simple calibration by eye is enough to give me a good result (compare the picture to my PC or TV monitor so that everything looks equal and is easy on the eyes).
    Thirdly, your desire for TB. That is simply a personal taste thing and you make that very clear, so I have nothing to criticize. :D I just wanted to say that I do not look at a TB port when buying my PC stuff. The TB enabled things out there are not for me (too expensive, too useless), it adds cost and energy consumption to devices. So I'm pretty happy that MS isn't supporting it here. Unless it comes integrated in the PCH, I don't want it.

    That's all I wanted to say. :)
  • Death666Angel - Wednesday, February 6, 2013 - link

    Oh, one thing more: Please add metric units to the imperial ones. :)
  • Death666Angel - Wednesday, February 6, 2013 - link

    Damn, forgot something else: I'm really disappointed by the power adapter. I would like to see everything that is in a reasonable power envelope (sub 60W) to use a PSU attached to the plug (for the wall socket) and not half way between the plug for the wall socket and the device plug.

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