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Amazon's Kindle Fire HD: Better; Can It Compete With The Nexus 7?

Battery Life And Recharge Time

Battery Life & Recharge Benchmarks (Background Info)

The second-generation Kindle Fire and Fire HD are middle-of-the-road performers in our movie playback test, delivering about six hours of battery life.

Notably, the MIMO Wi-Fi antenna configuration seems to be a major benefit in the browsing test, where the Kindle Fire HD overcomes the deficit seen above to enable more than seven hours of use. That's enough to almost match the Nexus 7.

Normalized Brightness Benchmarks

We know that a great number of users set their mobile devices to maximum brightness, which is why most of our battery data is taken in this real-world way. However, tablets don't share the same brightness ceiling, making such a comparison imprecise.

Although the battery life numbers below are captured at standardized settings to put each screen on even ground, it's common to dial up brightness on a low-gamut LCD to improve readability or visibility. Moreover, even if you put two devices calibrated for the same brightness side by side, there's no guarantee they'll look the same due to differences in screen quality. The only thing we're doing is fixing the luminance of a display for testing purposes.

Normalized to 200 cd/m2 (or nits), the Kindle Fire HD runs for nearly 10 hours while watching H.264-encoded video content. We don't have the first-gen Kindle Fire here to compare any more, but the second-generation model runs for seven and a half hours. But both tablets fall slightly behind Google's Nexus 7.

When it comes to Web browsing and music playback, the Kindle Fire HD jumps to the front of the pack, topping the third-gen iPad.

Gaming is becoming far more common on tablets. Unfortunately, it's difficult for us to find cross-platform benchmarks because there are so few games that run on both iOS and Android. Riptide GP is one of the few, and we put it on a demo loop to drain battery life. In some ways, this test is less forgiving to Tegra 3-based tablets because Riptide is specially optimized for Nvidia's SoC. As a result, we do see the Fire HD and second-gen Fire ahead of the Nexus 7, though behind the iPads.

Recharging

Amazon no longer ships an AC charger with its tablets. So, our recharge benchmarks for the second-generation Kindle Fire and Fire HD are the result of using the Amazon's new PowerFast charger, sold separately for $10.

With charging times to 90% under three hours and to 100% just over that, the second-gen Kindle Fire and Kindle Fire HD are ready to hit the road again in less time than either of our iPads and both of Samsung's Galaxy Tabs.

  • joepaiii
    Why not normalize to a constant brightness level on all tablets rather than max for the battery rundown tests? Since they all have different max brightness, your tests aren't that reliable for judging true battery life.
    Reply
  • Another great article, as usual, from this site. However this statement in inaccurate:

    "Buying a Nexus 7 locks you into Google's Play store and its movies, newspapers, magazines, and music."

    I have BOTH the Kinda Fire app and Barnes and Noble app installed on my Nexus 7. And that is one of the things I love most about Google's tablet: the ability to get content from any provider I want. I would also like to point out that my gf has the B&N tablet, and it is much better than the Kindle Fire for several reasons: 1) you can sideload your own content through a removable memory card, 2) it has a better screen, and 3) the build quality seems much better after holding both in your hand. It's a shame the Kindle get's more attention, the power of advertising I guess....
    Reply
  • nitrium
    Given these devices are also intended to be used as eBooks, why won't anyone test battery life reading an actual eBook - i.e. Wifi/Bluetooth off, screen on (probably at ~50% brightness), no background tasks, just the occasional page flip every 30 secs or whatever the average reading rate is. Is that too much to ask? I tried to find this info with Google, but apparently no one but me cares.
    Reply
  • freggo
    What turns be away from Amazon and on to the Nexus is, among other things, the multiple reports I ran into about Amazon messing with the content of the device.
    I don't care for a manufacturer remotely deleting things without my permission.
    Reply
  • mrmike_49
    no mention of printing - is it possible to print from ANY of these tablets to a net worked printer???
    Reply
  • acku
    joepaiiiWhy not normalize to a constant brightness level on all tablets rather than max for the battery rundown tests? Since they all have different max brightness, your tests aren't that reliable for judging true battery life.
    There was an interesting case study a while back by AMD that pointed out most people use their devices at maximum brightness, and we've always strove to lean more toward real-world conditions. Having said that, a while back, we also started to standardize our battery life tests to a fixed brightness setting. While not real-world, it does provide a window into how devices compare to one another in that specific scenario. Bear in mind that a fixed brightness on one display may look different on another because of gamut differences. Often times you'll push the brightness up on a low gamut LCD to improve readability or visibility. The article has been updated to include those results. We always intended to do so but this understandably doubles our benchmarking workload and battery life tests take a lot of time. Thanks for being patient.
    Reply
  • acku
    ryedawgAnother great article, as usual, from this site. However this statement in inaccurate:"Buying a Nexus 7 locks you into Google's Play store and its movies, newspapers, magazines, and music."I have BOTH the Kinda Fire app and Barnes and Noble app installed on my Nexus 7. And that is one of the things I love most about Google's tablet: the ability to get content from any provider I want. I would also like to point out that my gf has the B&N tablet, and it is much better than the Kindle Fire for several reasons: 1) you can sideload your own content through a removable memory card, 2) it has a better screen, and 3) the build quality seems much better after holding both in your hand. It's a shame the Kindle get's more attention, the power of advertising I guess....
    Yes and no. You can use the Kindle Android app to view ebooks from Amazon. That's the case with Android, iOS, and Windows. However, this is not the integrated interface that the Nexus 7 provides. It's a little different for viewing ebooks and magazines.

    More importantly is the difference in movie support. You cannot use the Nexus 7 to view Amazon Prime movies the same way on the Kindle Fire HD. H.264 streaming works when you're on an Amazon tablet, plain and simple. If you want to watch those same movies on the Nexus 7, you need to install Firefox and Flash. But that's still Flash, not the streaming H.264.
    Reply
  • acku
    nitriumGiven these devices are also intended to be used as eBooks, why won't anyone test battery life reading an actual eBook - i.e. Wifi/Bluetooth off, screen on (probably at ~50% brightness), no background tasks, just the occasional page flip every 30 secs or whatever the average reading rate is. Is that too much to ask? I tried to find this info with Google, but apparently no one but me cares.
    That's a great idea! Unfortunately it's very difficult to implement from a programming perspective to keep consistent across all devices and platforms.
    Reply
  • nitrium
    That's a great idea! Unfortunately it's very difficult to implement from a programming perspective to keep consistent across all devices and platforms.
    I'd actually settle for "idle" battery life, since reading an eBook is effectively utilizing nothing but the screen. So Wifi/bluetooth/GPS/camera off (not just unused, but literally disabled in settings), screen on (at ~50% brightness). Do these things last for days under these conditions? I can't find data for that anywhere. My primary use for a tablet would be eBooks, but I have no idea which reader (except the original Kindles) actually gives the best battery life for that specific purpose.
    Reply
  • andrys1
    Re the Barnes and Noble Nook Tablet HD that someone mentioned... A problem for marketing is that, despite the competition, it has NO cameras, not even one for Skype (important for family & friends who like to communicate via video chat), and, more important for many of us, B&N will not allow owners to enable installation of apps from non-B&N sources.

    Amazon does allow installation of apps from "unknown sources," so I have (from places like getjar.com or 1mobile.com) apps like Google Maps in satellite mode, Mantano and also Aldiko to read DRM'd ePub books legally. I also have the B&N Nook app, since I have the NookColor but prefer to just read on the Kindle Fire HD now.

    Very accurate article. As for the Kindle Fire HD, I love the stereo speakers with Dolby and good separation because they're relatively strong and very clear. I hate using headphones or earbuds as a rule (unless in public but I don't usually listen to anything while around other people) unless I'm wanting best sound in music. For me, although my hearing is not ideal, dialog is MUCH better on these than on laptop units I've tried.
    Reply