Charging, Battery Life & Dock Power

Both the W510 and its optional dock feature integrated 27Wh batteries. As a result, with the dock attached you can expect a near doubling in battery life. It’s not an outright doubling because the dock itself obviously draws some power.

With the dock attached Windows 8 recognizes both batteries and displays individual charge details in desktop mode:


Battery 1 is the W510 tablet, Battery 2 is the dock

The lock screen displays the combined charge percentage across both batteries to keep things simple.

Similar to how things worked with ASUS’ Transformer series under Android, the dock is used to charge the tablet’s battery. Only once the dock’s charge is depleted will the W510’s internal battery start to drain, at which point it will power both the tablet and the dock.

As is the norm with most modern tablets, the W510 introduces Acer’s own proprietary power connector. The connector itself is reminiscent of similar connectors from Apple (prior to Lightning), ASUS and Samsung. Both the tablet and the optional dock feature a power input so you can charge the system regardless of whether or not it’s docked. The same power connector is used to connect the tablet and dock so it functions for both power and data delivery.

Acer bundles an 18W power adapter with the W510. The power adapter itself isn’t anything remarkable, however Acer did use a nifty removable plug that easily twists on/off. The W510 only ships with the plug for whatever region you purchased it in so I’m not sure how useful this feature is, but it’s nice to see design innovation from Acer here.

Charge time on the W510 is pretty reasonable for a 10-inch tablet. I clocked in a full charge from 0% with the tablet off at 3.632 hours. Peak power draw during the charge was 16.74W at the wall.

Note that this is just how long it takes to charge the W510 itself. The dock contains another 27Wh battery which should roughly double charge time.

Intel’s Atom Z2760 inside the W510 is passively cooled, but under load the upper right corner of the tablet can get fairly warm. I measured a max surface temperature of 38.2C under a heavy CPU load.

Battery Life

We've started running our new smartphone web browsing battery life test on tablets as well. If you missed its introduction in our iPhone 5 review, here's a bit about the new test:

We regularly load web pages at a fixed interval until the battery dies (all displays are calibrated to 200 nits as always). The differences between this test and our previous one boil down to the amount of network activity and CPU load.

On the network side, we've done a lot more to prevent aggressive browser caching of our web pages. Some caching is important otherwise you end up with a baseband/WiFi test, but it's clear what we had previously wasn't working. Brian made sure that despite the increased network load, the baseband/WiFi still have the opportunity to enter their idle states during the course of the benchmark.

We also increased CPU workload along two vectors: we decreased pause time between web page loads and we shifted to full desktop web pages, some of which are very js heavy. The end result is a CPU usage profile that mimics constant, heavy usage beyond just web browsing. Everything you do on your device ends up causing CPU usage peaks - opening applications, navigating around the OS and of course using apps themselves. Our 5th generation web browsing battery life test should map well to more types of mobile usage, not just idle content consumption of data from web pages.

AnandTech Tablet Bench 2013 - Web Browsing Battery Life

With only a 27Wh battery, the W510 delivers our shortest runtime in our new test thus far. Normalizing for battery capacity however and the W510 looks quite competitive. Note the huge advantage that Samsung's Clover Trail tablet enjoys here however. I suspect there's something more than just a smaller battery holding the W510 back. Running the same test with the dock attached increases battery life by 86%.

Our video playback test remains unchanged from previous tablet reviews. Here I'm playing a 4Mbps H.264 High Profile 720p rip I made of the Harry Potter 8 Blu-ray. The full movie plays through and is looped until the battery dies. Once again, the displays are calibrated to 200 nits:

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

Video playback battery life is a similar story. Equipped with a fairly small battery for its screen size, the W510 weighs in at just under 9 hours of continuous playback. Samsung's 30Wh Clover Trail based ATIV Smart PC does much better by comparison.

 

WiFi & Camera Performance Reflecting on Windows 8
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  • jeffkro - Thursday, December 20, 2012 - link

    Didn't we see this atom chip get bested by the arm a15 in the new chromebook? Why would any manufacturer pay more for a lower performing atom chip? Until the latest and greatest atom chip comes out towards the end of 2013 its pretty clear the high end in inexpensive low power chips is going to be held by the a15 architecture. Reply
  • jeffkro - Thursday, December 20, 2012 - link

    I think phone and tablet devices based on the tegra 4 are going to be the gold standard for 2013. Reply
  • hrrmph - Thursday, December 20, 2012 - link

    How about:

    - Tegra 4 on the phone; and

    - Haswell on tablets?
    Reply
  • mrdude - Thursday, December 20, 2012 - link

    Haswell's 10W ULV chips will be priced as much as competitors' tablets. And I don't mean just the SoCs, I mean the entire tablet.

    I'm sure Haswell will be great, but unless you're willing to fork over >$900 for a tablet, and very few are, it's not going to fly with the public at large. What Intel needs is Bay Trail, not Haswell. By the looks of it, the A15 will be the king throughout most of 2013
    Reply
  • semiconshawn - Friday, December 21, 2012 - link

    I will willingly pay a grand or more for a tablet that rans full win8 at intel core speeds that has 256gb,8-9hrs of batt, high qual/dpi screen, and is thinner/lighter the the surface pro. I think by fall of '13 my device will be ready. Probably several to choose from. There may be an SP by then as well. Current crop looks undercooked to me. Reply
  • HisDivineOrder - Saturday, December 22, 2012 - link

    Yes, but mrdude said explicitly, "it's not going to fly with the public at large."

    You might be willing to put down $1k late next year for the tablet PC of your dreams, but by then we'll likely be in a world of $100 7" tablets by Google.

    $100 vs $1k? Even RT devices will probably be $300-700. Meanwhile, Windows RT offers no benefit over Android besides a useless desktop and sync'ing at the cost of sheer multitude of apps available.

    I think I agree with mrdude. Not many people will fork over $1k for a tablet that is like their laptop if they can keep using their current laptop PLUS buy a new $100 tablet every year for 10 years for the same cost of that Surface Pro.
    Reply
  • nofumble62 - Friday, December 21, 2012 - link

    Tegra4 has a bunch of new graphic cores. Since it uses same 28nm process, I wonder how fast it sucks down the battery. Reply
  • Lonyo - Thursday, December 20, 2012 - link

    Last I checked, ARM doesn't have any backwards compatibility with almost the entire library of x86 Windows applications. Reply
  • mayankleoboy1 - Thursday, December 20, 2012 - link

    Which means nothing, as these mobile chips are too underpowered to actually run the desktop x86 applications. It will run, just so slow you will throw the device in frustration. Reply
  • amdwilliam1985 - Thursday, December 20, 2012 - link

    It means a lot to have x86 compatible.
    Not everyone wants or needs to run photoshop or autocad.
    But Knowing that your tablet/pc can run stuff like notepad++, chrome, java and flash is A LOT to everyday regular consumer.

    My girlfriend uses both ipad and my EeePC from 2 years. Both products has its usage. But with this, she can get rid of those.
    Reply

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