iPad mini Review
by Anand Lal Shimpi & Vivek Gowri on November 20, 2012 6:10 PM ESTBattery 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.
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:
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:
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.
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.
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MadMan007 - Tuesday, November 20, 2012 - link
Here's another display-related thing to fix: the charts for Brightness (black and white) and contrast don't include the Nexus 7 for some bizarre reason..hmm...but the later charts on the same page 4 do.Anand Lal Shimpi - Tuesday, November 20, 2012 - link
Fixed, thank you :)Take care,
Anand
ksherman - Tuesday, November 20, 2012 - link
While I understand where you're coming from, the reason the Nexus is zoomed in is because the Nexus "fakes" it's resolution in the web browser to about 603 so that responsive web pages render elements larger so they're easier to use on the Nexus 7. So the side by side photo is simply comparing the default view on load.In fact, this is actually somewhat of a negative for the iPad Mini on responsive sites because it means it's rendering pages designed for a much larger display.
Source: http://www.lukew.com/ff/entry.asp?1663
MadMan007 - Wednesday, November 21, 2012 - link
Now this would be something interesting to investigate and inform readers about. I didn't know about different devices presenting different resolutions and am not sure what the differences really mean.Galatian - Tuesday, November 20, 2012 - link
As a medical student I fast pretty fast in preordering the cellular white iPad mini here in Germany. It is the perfect size to fit into a white coats pocket. I will read a lot of books on it, so it was a hard decision between this and the 4th Gen iPad. But size does matter and eventually Retina will come to the mini line. For right now I just have to live with the resolution.Granseth - Tuesday, November 20, 2012 - link
This is a big issue for me with the Ipad 2, and it will be the same with Ipad mini. When I try to use the Ipad2 as a productive device I often lose information I write because the webpages and apps has to reload when the device gets out of memory and have to free something to load the next app/webpage. And this has become much worse as the Ipad has aged, so it's terrible that they are selling a new device with only 512MB of RAM.But hopefully people will use this smaller device as a consumption device, and not a productivity device.
ratte - Tuesday, November 20, 2012 - link
Excellent review as always, balanced and informative.It's a pity that Apple can't easily go to an intermediate resolution like 1600 x 1200, like Android can, but is stuck with the rezdoubling. For me the mini would have felt more futureproof if they had used an A6 with 1Gb memory. but then this is Apple....
MadMan007 - Tuesday, November 20, 2012 - link
Yeah, they need something obvious but AWESOME to make sure everyone buys a new one next year.Gaugamela - Tuesday, November 20, 2012 - link
Now it's easy to understand why Apple wanted to ban the Galaxy Tab 7.7. The iPad Mini is a rip-off of it. With a much worse display since the GT7.7 had a Super Amoled + display of superior resolution.Samsung was a year ahead of Apple and it still holds up great, if Samsung updated it to Jelly Bean.
I would like to see a new Galaxy Tab 7.7.
And the display is a disapointment. It makes it a no buy device instantly, it's 130$ more expensive than the Nexus 7 and offers a worse display. Anyone that picks the Mini should only do it by the form factor or preference by iOS.
ltcommanderdata - Tuesday, November 20, 2012 - link
The form factor is why I'm considering the iPad Mini over the Nexus 7. It has great build quality, is thinner, lighter, yet has battery life that is similar or better and has a screen that's a third larger. The Nexus 7's advantage in screen resolution in itself is not as important for me because the screen is smaller so showing more tiny content isn't useful. The lower pixel density is a concern for clarity. The CPU may be weaker, but the GPU is stronger which given good GPU acceleration for UI responsiveness is a reasonable exchange. $130 more maybe worth it if the better form factor makes the device more useable so that it sees more use.