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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  • DaveSimmons - Thursday, December 20, 2012 - link

    If you get a chance could you test the Netflix performance, both on the screen and through the HDMI? Reply
  • fredbloggs73 - Thursday, December 20, 2012 - link

    I would also like to know how this tablet performs with an external monitor in a desktop environment. I get the feeling that the GPU will limit this function. Reply
  • unrulycow - Thursday, December 20, 2012 - link

    The table on the first page should be changed to reflect the fact that the Nexus 10 starts at $399, not $499 Reply
  • Anand Lal Shimpi - Thursday, December 20, 2012 - link

    Fixed! Reply
  • kyuu - Thursday, December 20, 2012 - link

    Yeah, that's about what I was worried about with Haswell -- marginally better CPU performance than the Atom we know and hate, and an utter crap GPU. Thanks but no thanks, Intel. If they stuck Brazos in these devices they'd be way more appealing (assuming a similar power-profile).

    I'm very interested in getting one of these devices, but Haswell is a no-go, and I'm not sure about something like the Surface Pro. Its specs are great (asides from Intel's crap GPU, again, but at least the HD4000 is passable), but I'm thinking it's going to be too heavy/bulky, too warm, and too noisy (fans) to be something I'd take over a regular laptop.

    Hopefully the 2nd gen devices come sooner rather than later, as these 1st gens just aren't cutting it.
    Reply
  • kyuu - Thursday, December 20, 2012 - link

    Oh, and uh... I remember a review of the Lumia 920 being in the works, like, weeks ago. Did that get shelved or what's going on with that? Reply
  • name99 - Thursday, December 20, 2012 - link

    Oh don't be an idiot.
    The numbers are basically that a high-end Atom is about 1.5x the CPU performance (on multithreaded tasks only? not clear from what Anand has given us here) of a high end ARM.

    Meanwhile a high-end IB i7 is 5x the performance of a high-end ARM, and Haswell will improve on that.
    Haswell is a high performance followup to IB, it's not a followup to Atom.
    Reply
  • kyuu - Thursday, December 20, 2012 - link

    Sorry, I am an idiot: I meant Clover Trail, the SoC in this tablet, not Haswell. That was an utter brain fail on my part. >< Reply
  • Ytterbium - Thursday, December 20, 2012 - link

    Hi Anandtech,

    Can you review the Dell Latitude 10 & Lenovo ThinkPad Tablet 2?

    I think each one has some unique features vs the ones you looked at so far.
    Reply
  • jeffkibuule - Thursday, December 20, 2012 - link

    I don't think the editors have enough time to review every single laptop/tablet released. Besides, is the Lenovo ThinkPad Tablet 2 even out yet? Reply

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