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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  • daar - Wednesday, November 21, 2012 - link

    Who manufactures the display? I recall in reviews of old this was mentioned, would be nice to see in future reviews of anything with displays this info, thanks. Reply
  • zepi - Tuesday, November 20, 2012 - link

    Since the current-gen ipad-retina-displays are pretty abysmal in terms of power usage (see displaymate's measurements for example), would it be unreasonable to expect LTPS or IGZO panels to make things considerably better?

    Apple uses Low-Temperature polysilicon IPS in iphone for a reason and it's said that the forthcoming IGZO's would help in power consumption as well.

    I think that Ipad 4 is a "failure" as it doesn't address any of the shortcomings of the 3rd Gen ipad. Namely weight, thickness and reasonably poor visibility in direct sunlight. Though Apple just decided it's not worth the tradeoff to use A6 instead of A6x to reduce the battery weight by a tiny margin.
    Reply
  • doobydoo - Wednesday, November 21, 2012 - link

    Firstly - the iPad 4 isn't a 'new iPad' as much as the iPad 3 was - it's an upgrade a partial way through the year, so it shouldn't be expected to address all 'the shortcomings'.

    Secondly - the iPad 4 doubles the GPU power which addresses the single biggest issue with the iPad 3 - the underpowered GPU. It's significantly faster than any other tablet (as is the iPad 3).

    Also it was important to get all the devices using the lightning connector.
    Reply
  • Alucard291 - Wednesday, November 21, 2012 - link

    Yeah its the newer new ipad >.>

    Also known as the biggest ripoff apple has yet produced. Lightning connector (differently shaped usb 2.0), not-really-upgraded soc which brought nothing for the end user. Right? Because iOS is always super smooth? Or is it not?

    Wait wait wait and you're also saying that having even more unused gpu power is a shortcoming that was addressed? Well no point arguing with such logic.

    Especially since the cpu is already outdated. A9's (even with a custom memory controller) are so 2011.

    Man you are a MASTER of facepalms. You initiate a wave of them with every post of yours.
    Reply
  • NCM - Wednesday, November 21, 2012 - link

    Alucard291 writes: "Lightning connector (differently shaped usb 2.0)"

    Bzzt! Wrong.

    Thanks for playing, come back when you've done your research properly.
    Reply
  • Jorange - Tuesday, November 20, 2012 - link

    Why did you zoom in on the Anandtech website on the Nexus 7, whilst the iPad mini is zoomed out, it makes the Nexus look like it can't display a full webpage which it can!! Subtle Anti-Android bias strikes again. Reply
  • ChronoReverse - Tuesday, November 20, 2012 - link

    I don't know about bias (I like to attribute ignorance over malice) but it seems particularly bad that not only is the N7 zoomed in compared to the Mini, but it's zoomed in so much that the N7's image is larger than the Mini's.

    I can see zooming so that they're physically the same size (but then the N7 would be using more pixels to render the same thing) but it's not even at that level.
    Reply
  • michal1980 - Tuesday, November 20, 2012 - link

    because Anand's bias is showing.

    Still waiting for this rumored 'Anandtech' windows 8 review. But OMG look a small ipad, the site owner himself reviews.

    Might as well start renaming the website 'appletech'
    Reply
  • Ryan Smith - Tuesday, November 20, 2012 - link

    Our Win8 performance guide will be done this week. We're not doing a massive review (that would mostly be rehashing our significant DevPrev and ConPrev articles) will hit all the high points.

    And note that what Anand does has no bearing on Win8. AnandTech is more than one person, and in this case since I'm the OS guru it's my article.
    Reply
  • michal1980 - Tuesday, November 20, 2012 - link

    I'm just disapponted that a site I've trusted and visted for years, is changing focus.

    if its an apple thing, there are tons of in depth reviews done right away, product, os, accessories etc etc.

    windows is now becoming the abandoned step child.

    look at this, pages of writing, that could be summed up in 2 words:

    smaller ipad.
    Reply

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