Battery Life and Charging

The iPad mini features an integrated 16.3Wh battery, easily smaller than the 43Wh unit in the iPad 3/4 but even smaller than the 25Wh used in the iPad 2. Given that the mini has roughly the same internals as the iPad 2,4, but with a substantially smaller battery, you can expect a corresponding decrease in battery life. The display is also smaller, which should reduce some of the power requirements a bit.

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

The mini actually outlasts the 3rd gen iPad in our heaviest WiFi web browsing battery life test, but the 4th gen iPad's move to a 32nm SoC solves that problem. Under load however both the new iPad and the mini are fairly close in terms of battery life.

We haven't yet rerun our new test on all of the tablets, so we turn to our older 4th gen test to provide some additional reference points:

Web Browsing Battery Life

If we look back at our older test we get good perspective on everything. The iPad 2,4 still remains the king of single battery tablets, and the mini just barely makes it over 9 hours of use on a single charge. The mini still lasts long enough for it to be more of an all-day device than a notebook.

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)

Apple's video decode hardware implementation has always been stellar, as a result the mini manages to do very well here. At over 11 hours of video playback on a single charge, the mini is only bested by some of its larger iPad brethren. The iPad 2,4 remains insanely awesome here.

Our final cross-platform battery life test is the new GLBenchmark 2.5.1 Egypt HD test. Here we have a loop of the Egypt HD benchmark, capped to 30 fps, running on all of the devices with their screens calibrated to 200 nits.

AnandTech Tablet Bench 2013 - 3D Battery Life

I no longer have a 45nm iPad 2 so I don't have results for it here, but the combination of the small 1024 x 768 display and 32nm A5r2 silicon gives the mini better battery life than the iPads equipped with a Retina display. The iPad 2,4 continues to offer amazing battery life here.

The GLBench battery life test gives us a reasonable minimum for the iPad mini's battery life, with the video playback test giving us a good maximum. You can expect to see 6.4 - 11.2 hours out of a single charge from the mini.

The mini comes bundled with a 1A charger identical to what you get with an iPhone 5 or a 5th gen iPod Touch. Using the new Lightning connector it'll take about 4 hours to complete a charge on the iPad mini.

GPU Performance Camera - Photo and Video Analysis
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  • Anand Lal Shimpi - Tuesday, November 20, 2012 - link

    That's not exactly true, the iPad mini was launched nearly a month ago, our review of it is very late. In the interim I have published articles on Intel's SSD DC S3700, Microsoft's Surface, the Titan Supercomputer at ORNL and Samsung's Cortex A15 based Chromebook.

    Take care,
    Anand
    Reply
  • Alucard291 - Wednesday, November 21, 2012 - link

    No offence but you could have just said - "same soc as ipad 2. Same display as ipad 2 except smaller so pixels are slightly denser Its lighter than ipad 2 and has the same form factor but smaller."

    There I wrote the review for you.

    Instead you guys put out this monster - showing tests? Of the same soc? Again?

    Well one more review site feels the need to get some apple advertisement revenue.

    And I approve how you compared it to mini cooper. Yeah great comparison especially since mini cooper is a car for people who can't afford a decent one but really want to seem cool...

    So yeah. What makes this product great is the apple logo on the back. As usual.
    Reply
  • Jakers Ugly Brother - Thursday, November 22, 2012 - link

    It would be so nice to read one single tech thread without running into a paranoid "Oh noes another site has sold out to Apple" screed like yours.

    But no, you haters have to spread your sick, sad bile across everything you see.

    Thanks for lowering the signal to noise ratio of yet another comment section.
    Reply
  • ltcommanderdata - Tuesday, November 20, 2012 - link

    Anandtech's Microsoft Surface review was up 3 days before the device was on sale and their Windows RT review was up the day before it shipped. The iPad Mini review comes 18 days after the tablet went on sale and they aren't or haven't yet done an iPad 4 (18+ days) or 5th gen iPod Touch (36+ days) review. From this you conclude that Apple reviews get done right away and Microsoft reviews take forever?

    Ryan already explained why they aren't doing a massive review for Windows 8 and are doing more focused articles instead, which doesn't seem unreasonable.
    Reply
  • blacksamurai30 - Wednesday, November 21, 2012 - link

    I don't see the reasoning behind your dissapointment. I've been reading for years (despite my only just making an account haha); they are easily the most informative on the internet. The crew here does stellar indepth reviews for pretty much everything. Don't use your own personal misgivings against Apple in an attempt to discredit the hard work that goes into reviewing these products, or the invaluable service it does for the internet and consumer knowledge.

    Keep up the good work Anandtech!
    Reply
  • Anand Lal Shimpi - Tuesday, November 20, 2012 - link

    Wow, honest mistake, let me reshoot that real quick. I shot that before I left for SC12 and didn't catch it in my final assembly of the article today.

    If anything, the photo I posted is contrary to the point I make in the text above. Things are bigger on the iPad compared to the Nexus 7.

    Give me a few and I'll get a better photo up.

    Take care,
    Anand
    Reply
  • Kepe - Tuesday, November 20, 2012 - link

    The same thing happened in two pictures. On pages 4 and 11, although that's the same image file.

    http://images.anandtech.com/reviews/tablets/apple/...
    Reply
  • Anand Lal Shimpi - Tuesday, November 20, 2012 - link

    Fixed in both places. Thank you! Reply
  • seanleeforever - Tuesday, November 20, 2012 - link

    and now you have to update the tags..

    for example. the last page, ipad mini is actually on the right. i am sure no one would mistaken those two, but still.
    Reply
  • Anand Lal Shimpi - Tuesday, November 20, 2012 - link

    Fixed. The black mini wasn't mine so I no longer had that for comparison, had to use the white model for this shot - but I hope this better shows the difference. I also exported the full size shots at 2800px wide if you want to get a better, up-close look between the N7 and iPad mini.

    I included two shots on the display page, but here's a link to all 4 I just took:

    http://images.anandtech.com/reviews/tablets/apple/...
    http://images.anandtech.com/reviews/tablets/apple/...
    http://images.anandtech.com/reviews/tablets/apple/...
    http://images.anandtech.com/reviews/tablets/apple/...

    Take care,
    Anand
    Reply

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