Charging & Battery Life

The ATIV Tab ships with a two piece power adapter that looks a lot like what you'd get with a Samsung notebook. The adapter is rated for 3.33A at 12V, but in practice it'll draw a max of 11.3W while charging (but not powering) the ATIV Tab.

The power supply must be fairly inefficient because even after 2.68 hours of pulling over 10W, the ATIV Tab's 30Wh battery is only 68% charged. After 3.44 hours the battery was at 85% of its fully charged capacity and it's not until 5.25 hours before the ATIV Tab will report being fully charged (after 4.5 hours it only has around 5% left to go).

The good news is that using the ATIV Tab while charging it doesn't appear to slow charge times down at all. The ATIV Tab is limited to pulling ~11W from the wall while charging, but if you're using the tablet while charging the power adapter will draw several more watts.

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

Battery life for the ATIV Tab is amazingly good. With a smaller display but the same sized battery, the Qualcomm powered tablet is able to best Intel's Clover Trail powered ATIV Smart PC. The display discrepancy makes drawing a direct conclusion here difficult, but we'll soon be able to repeat our Clover Trail power experiments with a Krait based tablet to see how close those two SoCs really are when it comes to power consumption.

At 10.82 hours off of a 30Wh battery, the ATIV Tab does better than even the 4th generation iPad.

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 decode battery life is outstanding from the ATIV Tab - we finally have a tablet that can equal Apple's iPad in terms of battery life when playing back video. There's a clear advantage here over the Clover Trail based platforms, and obviously compared to the Tegra 3 based Surface RT as well. I believe what we're seeing here are the benefits of TSMC's 28nm LP process delivering extremely low leakage while the SoC is mostly idle. Qualcomm's video decode block seems to do a great job at being very power efficient here.

Performance The Display


View All Comments

  • MonkeyPaw - Friday, January 04, 2013 - link

    I would love to see some cross-platform comparison. If my Tegra3 Android device produces that different of a result, I'd be interested to see just how different everything else might be. Reply
  • Relic74 - Wednesday, January 23, 2013 - link

    I just recently purchased a Lenovo Thinkpad Tablet 2 and I have to say I'm really enjoying it. So much so that I'm selling my iPad. I tried to like the Apple, everyone has one, everyone seems to not be able to live without one, except me. Sure it's pretty, great hardware but the OS is so crippled and simplified it drives me crazy. The lack of media codecs, Flash, Java and something as simple as a file-manager doesn't help either, not to mention that the interface is boring and old. However for a while that was really the only viable tablet OS available, sure Android had the aforementioned but the UI is clunky, at times unstable and twitchy to say the least.

    Windows 8 though, finally a OS that is not only fast but is also capable of getting real work done. Even now in it's beginnings the OS wipes the floor with iOS. I'm not a Apple hater as I really like OSX, I own a Macbook Air and love it but iOS just drove me crazy.

    The Lenovo Thinkpad Tablet is one hell of a kit, it came down to that and the Asus 810c, I chose the Lenovo in the end because of the size plus I totally dug the look and feel. The little guy does everything I always wanted in a tablet; great battery, fast UI, nonrestrictive in what can and cannot be installed, a file-manager and a Mini SD slot. No Mini-SD card, who does that, Apple. I also don't want to have to plug my tablet into another computer and have to use a music player to transfer files across. Yes I know you can do it wireless. Skydrive is awesome, runs circles around iCloud not to mention I can sync certain folders because I have a file-manager, sorry as you can tell I have a real problem with sandboxing. I like it when my apps talk to each other, I like it when I'm in the photo manager and I can access the local drive or the many cloud services.

    Even though my Lenovo is running on a Atom CPU you would never know it as it's very, very peppy. The lack of apps is a little disconcerting at the moment but hopefully by the end of this year MS will be a little caught up, but hey at least there is Evernote and the Facebook app is pretty good. I'm very happy with MS, first time in a long time. I'm just so glad to finally have a tablet OS that is worth a damn, sure iOS has the apps but that damn system hasn't really changed in the last 2 years, their just playing catch up with Android now.

    On a side note stay away from RT for the time being, it really doesn't make sense right now as there isn't much that runs on it. The new HP 900 or Lenovo Tablet 2 are the way to go, even the Asus VivoTab 810c or Smart are superb machines.

    Windows 8 on a tablet just makes sense and I highly recommend anyone looking to buy a tablet in the near future to really give it chance, I promise you will not be disappointed.

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