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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  • HoushaSen - Friday, February 8, 2013 - link

    Aside from the weight (1.8 lbs), the lenovo's upcoming Core hybrid tablet/ultrabook have one major advantage, which is the battery life. To be honest, 1.8lbs vs. 2.0lbs won't make a difference for me as anything over 1.5 lbs is just not comfortable to hold in one hand i.e. either way it won't work as pure tablet for me.

    So the true major benefit of getting Helix over the Surface Pro for me was the battery life. Despite both system having the identical battery capacity (42W), Lenovo claims 10 hours battery life because it has the battery equipped keyboard dock.

    If MS truly releases one for Surface Pro, and obviously for the reasonable price I think the advantage of Helix goes away (remeber helix starts at $1499).

    Plus when MS is designing this new keyboard, I hope they have also put lap friendly design for consideration as well to solve that issue.

    But since battery life has been listed as one of the major downside of this device everywhere, I think MS should simply announce the dock on its way officially to at least make most people believe there is a way to extend battery life. Anyways, this is just my opinion.
  • Jaerba - Friday, February 8, 2013 - link

    They teased the hell out of a battery keyboard dock during their AMA, so I expect it's on its way. I just wish they'd 100% confirm it and give a date.

    Really, a keyboard dock could solve three of its major problems (battery life, multiple viewing positions and keyboard quality.) You'd really just have the text scaling issue as the one major gripe.
  • IUU - Saturday, February 9, 2013 - link

    So you get a computing device that is 5 times to more than an order of magnitude powerful compared to arm devices and still getting half the battery life, for not quite double the price?

    Not taking into consiferation that the next generation of Intel's processors will be significantly more efficient?

    Being able to run any x86(legacy ... lol) program without relying on an "app" store?

    Being able to expand and transfer memory any way you want, even managing to run demanding desktop programs, even though a bit slower than a desktop?

    Sounds like a pretty good deal to me(compared to arm offerings), though something normal and expected in the pc world!
  • Tams80 - Saturday, February 9, 2013 - link

    It looks good, but I think the Thinkpad Helix will probably be a better option when it's released, even though it will be more expensive. For someone like me, this would be a considerable purchase no matter what, so I'm more than prepared to pay more. The Fujitsu Q702 could be contender, but the display resolution is poor and the Sony Duo 11 is tempting, but is not a dock tablet and has limited keyboard space.

    My ideal tablet PC is a pipe dream.
    -Something like the Fujitsu T902, but being a dockable/detachable, with a swivel 'docking bracket''.
    -Ideally a dGPU - an AMD APU (with -G graphics) paired with AMD -M graphics in hybrid crossfire. The dGPU would be in the dock.
    -mSata SSD in the tablet/lid
    -HHD/SSD in dock
    -modular bay in dock
    -Anytime USB charge on at least two USB ports
    -USB 3.0 ports, one/two on tablet, at least two on dock
    -LightPeak/Thunderbolt/whatever that mess seems to be doing
    -Active digitiser - Wacom Penabled still appears to be the best
    -SD/other card reader
    -large trackpad on dock with physical buttons
    -13.3 display
    -1920x1200 display (or double that resolution)
    -ample bezel buttons
    -at least acceptable speakers
    -1080p webcam, or whatever the marketing term used now is
    -some decent microphones
    -trackpoint/whatever other companies call it?
    -ExpressCard? Is there an updated version?
    -not sure about a rear camera - rather pointless on such a device

    Yeah. That's never going to happen.
  • topdomino - Saturday, February 9, 2013 - link

    In december, you called the Dell XPS 12 "the coolest ultrabook around" and mentioned that fliping the screen creates a tablet.
    http://www.anandtech.com/show/6510/holiday-2012-ul...

    Given that the specs on the 128 GB Surface Pro and the current base model of the Dell XPS 12 are so similar:
    Surface Pro: 1.6GHz base clock, 4 GB Ram @ 1600MHz, Intel HD 4000 graphics, 128 GB SSD, $1,128 (with Type cover);
    Dell XPS 12: 1.7GHz base clock, 4 GB Ram @ 1333MHz, Intel HD 4000 graphics, 128 GB SSD, $1,199 (comes with keyboard);

    I would have expected a direct comparison between them to be the most useful one.
  • bogieworf - Saturday, February 9, 2013 - link

    Comes down to whether you want a PC that is more like a tablet or a laptop. That smaller dimensions of the Pro are simply more tablet like, Of the two, the XPS is probably the better bet right now.

    Because it is convertible size, it has fewer tablet like demansd made of it. For example, I never heard of the XPS 12 being slammed for battery life like the Pro because the XPS battery life is in line with most convertibles on the market. The larger size also allows for a better keyboard. It also has a wider, and more convertible like array of specs.

    The Pro is tablet size and people expect it to perform like a tablet. Unfortunately, that requires Haswell and probably a cellular option as well. Both will probably come with the Pro 2.
  • Death666Angel - Sunday, February 10, 2013 - link

    All I read there is "cater to the stupidest among us". The XPS12 looks less like a tablet so less people will expect it to behave like a tablet as opposed to the Surface Pro? How brain damaged should we expect consumer to be?
    Actually, pretty brain damaged if I go by most reviews, which treat the Surface Pro as an iPad competitor and rank it accordingly. It boggled my mind.
  • damianrobertjones - Saturday, February 9, 2013 - link

    How come none of them appeared in the battery life section? They actually, in some cases, destroy the competion in performance and battery life?
  • Death666Angel - Sunday, February 10, 2013 - link

    How would an Atom powered anything destroy a Core i-5 powered anything (or anything that is above a Celeron really)? Battery life? Sure. But what good is 6 hours of continuous use when you have to limit what you actually can do with it vs. 3 to 4 hours of continuous use without limits? If you need the battery life and don't need the performance, the choice is clear. And vice versa. :)
    I would have liked to see a comparison with the Samsung XE700T and the Acer W700 (which is perfect except for lacking a digitizer). But I can understand that they don't have everything.
  • lmcd - Sunday, February 10, 2013 - link

    but I'm more interested in what happens when Google puts out a better version of their Chrome mobile browser. As noted, the Nexus 10 wasn't that horribly off from the Surface Pro, and I think with some OS optimization (or replacement with a nice KDE Plasma Active setup :-) a Nexus 10 + keyboard dock of some kind would knock out the Surface Pro and RT in one shot.

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