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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  • menevets - Friday, November 23, 2012 - link

    I own an iPad and debated between the Mini and the Nexus 7. I went with the Nexus 7.

    Without rooting, I can copy files from camera to external hard drive without resorting to wifi or buying anything extra. GPS, turn by turn voice navigation, offline maps, easy integration with Google tools like Mail, Picasa Web, YouTube, etc... I can see why someone would want a wider screen, but the narrower N7 can fit in more pockets and make for easier holding on the train. And in general, there is much more detail in settings.

    The N7 is sorely missing a rear facing camera. I like to photograph articles, documents, basically text. The 1.2 megapixel front facing camera is not enough to capture text clearly. The build quality is a little suspect, for example, the screen lifting problem.

    Jelly Bean, in general, may be more buttery smooth than its predecessors, but it is much easier navigating iOS, selecting text, scrolling, etc... iOS is much more responsive.

    Obviously iOS app selection is better, but I notice that Android equivalent apps are not as good. For example, the Kindle app on iOS, when you highlight a word on the bottom of the screen, the definition appears on the top, which allows you to alter the highlighting selection. The Android version, the definition covers the bottom so you can't change the highlighting selection. I noticed other instances of how the iOS app works better than its Android equivalent. Dropbox, Evernote for example.

    Google Play has a limited selection of movies and tv shows compared to iTunes/Amazon.

    So my use case for the big iPad is reading music scores from the piano, reading books with complex formatting, reading novels at home - fewer page turns, videos and apps I can't get on Android. The N7 for everything else.

    So the above N7 drawbacks for me are well worth the $130 savings.. Hope this helps others in their decision.
    Reply
  • Rodney McKay - Friday, November 23, 2012 - link

    I went to an Apple store today (Black Friday) planning to buy a 4th-gen iPad on sale. Though I hadn't yet seen a mini, I dismissed it out of hand because I "wanted a retina display". It happened that there was a mini next to a iPad 4 on display, so I compared them. The resolution difference wasn't really obvious to me (after all, the mini has a higher pixel density than the iPad 2), and in reading text (web pages, for example) I felt no clear preference. The mini's display was somewhat yellower/warmer than the 4's, which I didn't much care for. However, I opened Apple Maps on both, and was shocked to see that that the mini had a MUCH clearer display than the 4. On the mini, the smallest streets were clear at the zoom level where they appeared, but on the 4 they were so washed out as to be almost invisible. And in pretty much every other respect, the mini's Maps display looked better. I spent half an hour mucking with brightness and zoom levels trying to equalize the displays for a fair test, but no matter what I did the mini display was dramatically better.

    So, I tried an iPad 2 next to a 4, and got exactly the same results. The 2's display looked very much like the mini's (albeit larger), with map details much clearer than on the 4 (a *different* 4 from the one I compared to the mini, so this wasn't just a sample glitch with that particular iPad). I called over a store rep and showed him my results. He said "Hmm... but the Retina Display is better on things like photos and videos. Watch..." and he brought up the same sample image on both. We were both surprised to see that the image on the 2 was again dramatically nicer (less washed out, in particular) than on the 4, and at that point I realized that the real difference is that the 4's display has rather poor contrast (for which there is no adjustment), which would account for all the differences I observed.

    I very much prefer the Retina Display on my iPhone 4s (and my wife's 5) over the previous ones, but on the iPads it seems to be significantly flawed (at least with the two samples I tried). I left the store with an iPad mini, even though it was the only iPad not on sale today.

    I have a feeling that iPad reviewers haven't really been doing side-by-side comparisons between models. I dread the day when the iPad mini gets "upgraded" with a Retina Display--maybe I'll stock up on them now.
    Reply
  • SanX - Sunday, November 25, 2012 - link

    ROTFL go to the eye doctor
    usually only technical illiterates or salespeople having merchant interest write such bs
    Reply
  • miatadan - Saturday, November 24, 2012 - link

    I had the iPad 2 for a while and sold it as too large to take it with me daily. I purchased the wifi 32GB black model.
    It is the apps available for iOS that make the iPads attractive. I use n-Stream for Naim network player, use it as remote with Logitech app. Skype works well, Textplus for free texting nice.

    I tried Rim blackberry playbook, liked actual hardware but no apps I could use....

    Even with Targus case Mini iPad fits inside pocket of winter jacket when walking, hopefully once summer comes around I find summer jacket with large enough inside pocket.

    Regular iPads at work feel heavy now compared to Mini, so I agree with Anand.
    Reply
  • SanX - Sunday, November 25, 2012 - link

    You wrote "It pains me to say it, but compared to most similarly priced notebooks, the iPad mini's display is amazing."

    Should be "It pains me to say it, but compared to most similarly priced notebooks, the iPad mini's display is amazing trash. I really do not know what's went wrong with Apple and in which city dump near Cupertino they found such display"
    Reply
  • jameskatt - Sunday, November 25, 2012 - link

    The problem of going the Full Retina Display Route is that that is an even ultra higher resolution than the iPad 3-4. And the battery and GPU needed would make it heavier, larger, and more expensive. This is thus not the route.

    Apple can more easily make the iPad Mini like the iPhone 5: increasing the vertical resolution and not forcing existing apps to rerender. They just keep working as before but with letter-boxing. This solution would increase the resolution so it is Retina-like and would work with existing apps.
    Reply
  • MobiusStrip - Monday, November 26, 2012 - link

    Another idiotic glossy screen. Reply
  • iSee - Monday, November 26, 2012 - link

    These are also all reasons the iPad and iPhone can't have retina displays.
    Hm.
    Reply
  • Alex Veit - Wednesday, November 28, 2012 - link

    If you give someone $5 they will ask "why didn't you give me" $10.
    Just the fact that most applications that a few years ago could only be performed on a desktop or laptop are now being implemented in handheld devices is freaking awesome!!
    who cares about the minor dimension differences in between the devices.

    By the way, if you own an iPad and you want to get the most out of it http://d7a79zq53j51xd1830fjvzkexx.hop.clickbank.ne...">Click
    here to get some awesome stuff.
    Reply
  • EarthCore - Thursday, May 30, 2013 - link

    AnandTech "unbiased" tests always seem to be skewed toward Apple. The Nexus 7 can easily get 13+ hours runtime looping a 720p movie:

    http://forum.xda-developers.com/showthread.php?t=2...
    Reply

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