Battery Life

Apple has always advertised the iPad as achieving all day battery life. I've generally found that to be true based on my usage, although on days where I use the larger iPad Pro with the Apple Pencil heavily I can find myself looking for a charger by the time the work day is over. With our 2016 mobile test suite we've rolled out a new WiFi web browsing test that is more taxing on devices than the previous one, along with moving from GFXBench's T-Rex HD battery test to Manhattan Metal. With the 9.7" iPad Pro having a similar battery capacity to the iPad Air 2 it can hopefully be expected that battery life remains the same, or possibly improves.

Web Browsing Battery Battery Life 2016 (WiFi)

In our 2016 WiFi web browsing test the 9.7" iPad Pro comes in at roughly the same runtime as the iPad Air 2. Apple has always advertised a ten hour battery life for iPads, and that generally held true in our old test which did static page loads. But in our new test the iPads simply can't last that long due to the heavier and more representative workload.

Unfortunately I no longer have the Tab S2 for comparisons to a non-Google Android tablet in this test, but when it comes to battery life the 9.7" iPad Pro lasts a bit longer than the Nexus 9 and significantly shorter than Google's Pixel C. The Pixel C is also significantly thicker and heavier, but its LTPS display also helps it to drive down platform power, and I wouldn't expect to see the iPads approach it any time soon with Apple's continued focus on driving down mass and thickness, and reliance on IGZO displays to achieve their switching refresh rate.

Video Playback Battery Life (720p, 4Mbps HP H.264)

The 9.7" iPad Pro does well in our video playback test. This test hasn't changed from the 2014 one, as my measurements found that the impact of moving to higher resolution and higher bitrate test files has a negligible impact on battery life due to the fact that the decoding for H.264 is all handled by dedicated hardware. You can see that the Pixel C still leads the pack, and the Tab S2 is close behind it even though it's incredibly thin and has a relatively small battery, and this is due to its AMOLED display using much less power in low APL videos than your typical IPS LCD on a tablet.

It's worth noting that we see a regression here from the iPad Air 2. The 9.7" iPad Pro actually has a slightly larger battery than the iPad Air 2, and I'm not sure where the difference here is coming from (possibly the display?), as our video playback test is conducted in airplane mode with no background tasks or location services, so there's not much room for software variance.

GFXBench Manhattan 3.1 / Metal Battery Life

GFXBench Manhattan 3.1 / Metal Final Frame Rate

In the GFXBench 3.1 Manhattan battery test the 9.7" iPad Pro performs incredibly well. Not only does it last slightly longer than the iPad Air 2, but the GPU performance throughout the test is more than double that of the A8X. With our old T-Rex HD test we saw Apple's devices essentially maintain the same frame rate for the entire test, as the GPUs were so fast that they were actually spending time idling. With Manhattan this isn't the case, and we see that the 9.7" iPad Pro does show signs of throttling. In general the performance is still very stable, and the throttling is not near as serious as what I've seen on competing Android tablets running the old T-Rex test with its lighter workload.

Charge Time

Smartphones have gone from taking several hours to charge a few years ago to only taking an hour or two today. Unfortunately we haven't see such improvements with tablets. While charge times have certainly gone down with Apple's 9.7" iPads, that's due to shrinking batteries rather than significantly faster charging. With the 12.9" iPad Pro Josh measured a charge time of over five hours, which is really unacceptable to say the least. With the 9.7" iPad Pro using a battery of similar size to the iPad Air 2, it can hopefully be expected that the charge time will be similar too.

Charge Time

Apple includes a 10W brick with the 9.7" iPad Pro. I actually haven't kept track of when they switch between 10W and 12W, but I can tell you that they need to start shipping these tablets with something closer to 20W or 30W. They happen to already sell something that fits the bill quite nicely, and customers would appreciate it. In the case of the 9.7" iPad Pro the charge time is much shorter than the five hours that the 12.9" model takes, but I think we really need to see improvements in how long it takes to charge these devices. When you use an iPad all the time for writing with Apple Pencil it will most certainly be nearly dead when you get home, and that means you can't use it for the rest of the night unless you keep tethered to a power outlet. Hopefully we see improvements made here with the next generation of iPads, along with the rest of the tablet market in general.

System Performance Display Analysis: Color Accuracy in DCI-P3 and sRGB


View All Comments

  • Shadowmaster625 - Wednesday, June 1, 2016 - link

    So this thing really does outscore AMD's top end FX-9590 in kraken 1.1? Reply
  • bernstein - Wednesday, June 1, 2016 - link

    very interesting! in other words: it's almost half the speed of intel's top end i7 6700K in kraken 1.1...
    ...but in WebXPRT it's 200 vs. 3000 points...

    So what's the more realistic results?
  • bernstein - Wednesday, June 1, 2016 - link

    i7 6700K: Reply
  • tuxRoller - Wednesday, June 1, 2016 - link

    That score of 3000 is..I don't know, but a 2015 xps 15 scores around 440.
    So, about twice as fast as the Apple soc, but with better process, higher power budget and much larger tdp (given that it's in a full size laptop).
    Apple's doing an amazing job with their cpus. If they actually spent the die budget to enable smt they'd be right up there with core m.
  • tuxRoller - Wednesday, June 1, 2016 - link Reply
  • michael2k - Wednesday, June 1, 2016 - link

    More interesting to compare it to a

    Carrizo is essentially Atom class and it's predecessor, Kavari, is found inside the PS4 and XB1, albeit with a more powerful GPU and an additional 4 cores. So if you can imagine a 4W processor competing with a 65W CPU:

    That leaves about 50W for Apple to integrate, say, a Pascal GPU if they really wanted to create something incredibly powerful.
  • mdriftmeyer - Wednesday, June 1, 2016 - link

    You are high if you compare a 4 core Excavator to an Atom. Reply
  • 255BB - Thursday, June 2, 2016 - link

    PS4 and Xbox one use Kabini not Kaveri. A 4 cores Kabini has a 15W TDP.
    Carrizo is not an Atom class .Its TDP is 15-35W (Carrizo-L is Atom class)
  • Meteor2 - Thursday, June 2, 2016 - link

    Perhaps the same *performance* class. Not power class. Reply
  • michael2k - Thursday, June 2, 2016 - link

    Right. So take a 4W SoC that currently has two cores and bump it up to 8. An A9X at 2GHz and 8 cores might take 15W. Throw in a Pascal GPU and now you're 35W, or 65W, depending on compute cores.

    On single thread performance we see the A9 is between Atom and Core at the same clock. That means it is also at the same performance level as Kaveri and Kabini.

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