Battery Life

It probably goes without saying that battery life is a critical aspect of a mobile device. After all, something that spends a significant amount of time tied to an AC adapter for power isn’t very mobile at all. In order to properly test battery life, we use our standard battery life test suite, which covers a range of display-on scenarios from mostly display-bound light web browsing to aggressive processor and graphics workloads that can be found in 3D games and Lollipop local app compilation. This allows us to see the power consumption of various components within the system, and in the case of the more extreme tests we can also see what sustained performance is like for various aspects of the system.

However, before we get to the battery life results I want to talk a bit about display power, which is a bit of a perennial question in our battery life tests. While you can roughly separate out display power in battery life tests the data often isn’t present to say whether one type of display is more efficient than another. Ideally, we would disassemble devices and wire up a power monitor to the battery terminals, but with review units supplied from the manufacturer, this is often a non-starter with the T&C of their sampling program. Therefore, for this test we decided to test for display power by measuring power consumption using the internal fuel gauge. This allows us to get some kind of number for power measurement, but it’s important to emphasize that this is just a way of getting a measurement that’s more precise than plugging the phone into an AC adapter and trying to guess true power consumption based upon AC adapter power draw.

In the case of the Mi Note and Mi Note Pro, we’re faced with an interesting situation because the only real difference between the two devices in terms of power is that one uses a Snapdragon 801 with a 1080p display and 3GB of LPDDR3, while the other has a Snapdragon 810 with a 1440p display and 4GB LPDDR4. In a purely idle display situation, the Mi Note Pro and Mi Note look to be almost identical in terms of power consumption. I’m not sure how Xiaomi accomplished this, but the result is impressive to say the least.

Web Browsing Battery Life (WiFi)

Moving past our display power testing, the web browsing test is the lightest test in our suite that includes both RF power and some CPU workload. Here, we see some pretty interesting result. Assuming both devices have nominal battery capacity the Mi Note averages around 1W in this test. The Mi Note Pro averages about 1.2W, or roughly 200 mW higher throughout the test. Both displays are in a command mode to enable panel self-refresh and power appears to be roughly equivalent. While the M9 had a number of confounding factors, with the Mi Note Pro it is increasingly evident that the Snapdragon 810 causes a noticeable regression in battery life, even in very light CPU workloads where the work done per time is identical. At any rate, both perform respectably in this test, even if the Mi Note Pro does fall a bit short relative to other phablets.

Web Browsing Battery Life (2G/3G)

Unfortunately, with the Mi Note devices we don’t have the ability to do our standard LTE comparisons, but I’ve run the same test on AT&T’s WCDMA network which should provide a decent modem comparison as well. Interestingly, here it seems pretty clear that the gap that appears in WiFi browsing almost disappears when running on HSPA+. Given that 3G strongly stresses modem performance, it does appear that the modem in the Snapdragon 810 brings power efficiency improvements over previous generations. However, it looks like it isn't quite enough to completely compensate for the difference in CPU efficiency.

Mi Note / Mi Note Pro

PCMark - Work Battery Life

Moving on to PCMark, our balanced CPU/display battery life test, we see some interesting results as well.  If we look purely at power, one would probably assume that the Snapdragon 810 is losing here, but once you consider average performance throughout the test, the Mi Note appears to do worse overall. However, due to Xiaomi’s rather conservative governor on the Mi Note and the different Android versions it’s hard to draw any conclusions from this test as PCMark results are strongly dependent upon Android version. The one device that we have on-hand with Snapdragon 805/801 and Lollipop 5.x is the Galaxy Note 4, which clearly exceeds the Mi Note Pro in both performance and runtime even after compensating for the difference in battery size. I didn't realize this until writing up the review, but PCMark is probably the best demonstration of the battery life improvements that come with Lollipop and ART as this is one of our benchmarks that strongly depends upon VM performance.

BaseMark OS II Battery Life

BaseMark OS II Battery Score

At the more extreme end of the segment, Basemark OS II is a test designed to really place significant pressure on the CPU. In this test, we once again see that the Mi Note lasts significantly longer than the Mi Note Pro. If you’re like me, you would probably assume that the Mi Note does so because it doesn’t deliver as much performance, but looking at the battery score shows that the Mi Note Pro consistently sustains higher load over the duration of the test. Xiaomi has done a great job of keeping thermals under control with the Mi Note Pro, but despite this it’s clear that the SoC is just consuming a lot of power here.

GFXBench 3.0 Battery Life

GFXBench 3.0 Performance Degradation

In GFXBench, our GPU-bound rundown test we actually see some interesting results. The Mi Note lasts slightly less time than the Mi Note Pro (2.75hrs to 2.92 hrs), but with a higher frame rate on the Mi Note using the Adreno 330 rather than the Adreno 430. This comes apparent when you remember that the Mi Note is only rendering at 1920x1080, compared to the Mi Note Pro at 2560x1440.  The Mi Note also manages to basically last the entire test run without any noticeable throttling. The Mi Note Pro does have noticeable throttling relative to the start of the test, but even in the throttled state it beats out the Mi Note despite the higher render resolution. So the Mi Note doesn't throttle and has the higher frame rate by ~15%, but the Mi Note Pro lasts longer and does so at a higher resolution.

Overall, the battery life of the Mi Note is acceptable and comparable to most phablets on the market, while the Mi Note Pro falls slightly under par. I doubt most users will really notice a big difference here, but both devices should get most people through a full day of use without any kind of range anxiety. Given that the SoC is basically the single biggest difference between the two devices when it comes to power consumption, it’s definitely concerning how the Mi Note Pro appears to regress relative to the Mi Note in any kind of CPU-bound workload when the Snapdragon 810 is fabricated on a more advanced 20nm process.

Charge Time

Battery life is usually the primary way by which mobility is determined, but in a number of scenarios charge time becomes critical. The usual cases where this might happen include forgetting to plug in your phone before going to bed and long distance flights. I’m sure there are a number of people out there that will point to most of these cases as a good reason for removable batteries, but based on discussions with OEMs it’s clear that most people don’t carry a second battery around on a regular basis. As a result, the speed with which a smartphone can charge is relevant in these scenarios. In the case of the Mi Note, the charger is limited to a rather standard 5V, but the Mi Note Pro supports QC 2.0 fast charging at 9V. The included charger is limited to 1.3A though, so much of the charge speed improvements will come from less power loss over the charger cable rather than higher wattage. In order to test charge time, we measure the time it takes for a phone to charge with its included charger until the phone indicates 100% either through an LED or by measuring power draw at the wall.

Charge Time

As we can see, the benefit of fast-charging with the Mi Note Pro’s included charger is relatively small but definitely noticeable. It actually ends up about as fast as the OnePlus One with a 5V, 2.1A charger which suggests that this move was mostly done in order to improve energy efficiency and mildly improve charge rate while balancing battery longevity. It's worth noting that even though the Mi Note Pro has the same charge time under our testing, looking at the graph it's clear that the Mi Note Pro will charge faster in the linear region before slowing down to achieve the previously mentioned improved battery longevity.

The Mi Note performs as one would expect from a standard 5V charger, and doesn't support fast charge judging by its behavior on the charger. Overall, both phablets do about as well as one would expect here. Looking at the mobility equation holistically, the Mi Note is better than the Mi Note Pro, and as a result the conclusions for both are noticeably different. I would say that the Mi Note is on par with other phablets launched today, but the Mi Note Pro is below average due to the Snapdragon 810 in this device, v2.1 or not. It's unfortunate that this is the case, but I suspect Xiaomi has been backed into a corner when it comes to SoC choice here.

Introduction and Design Display
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  • prisonerX - Saturday, September 12, 2015 - link

    Why would anyone care about that?

    Did you just discover that China is a communist/authoritarian?
  • sonny73n - Sunday, September 13, 2015 - link

    WTF is wrong with you people? Is capitalist better than communist? How about Saudi Arabia - our "ally"? Stop mixing politic and nationality with tech. FYI more than 80% of products in the U.S. are made in China that included the beloved iPhone. Oh iPhone which costs ~$210 to make but priced at $650. How's that capitalism for you? So please keep the politic bs and racial comments at CNN, Fox or whatever fake news site you like. This is a tech site for God's sake.
  • Yaru - Sunday, October 4, 2015 - link

    I'm not a big fan of the a Chinese government and some of their internet policies.......but so what? It's a review of a product not some geopolitical analysis.

    Also while it's nowhere near the same level, the US government DO give subsidies companies (though tech industry isn't one of them). All goventments gives out subsidies to one degree or another.

    Also, where do you think a lot of tech companies manufacturer their products? Those savings from the cheap labor, where do the profits goes? Back to US tech companies.
  • Penti - Friday, September 11, 2015 - link

    I don't see what's up with all the whining, these devices are not sold in Europe by retailers and distributors or by operators. Through their sales in China it's one of the big five brands though. Nobody whines when it comes to Oppo or OnePlus reviews.
  • soccerballtux - Saturday, September 12, 2015 - link

    'for those who don't spend their whole lives reading about this'--LOL

    another good review, thanks. impressive phone...bit worried about where my data gets stored (Chinese Clouds are polluted with government eyes), no microSD, and thankfully this doesn't have NFC or Qi so I'm less tempted to purchase, but wow does that have a refined look or what...
  • Penti - Saturday, September 12, 2015 - link

    I only saw local and Google as options in the pics. I'm pretty sure you can use it without a MI account, and thus nothing syncing to the "MI Cloud".
  • BMNify - Saturday, September 12, 2015 - link

    Mi cloud is opt-in and Xiaomi has migrated its Mi cloud servers to Singapore and India for the International customers and it is handled by Amazon Web Services, here is the link to AWS itself talking about Mi cloud: https://aws.amazon.com/solutions/case-studies/xiao...
  • Penti - Saturday, September 12, 2015 - link

    I'm pretty sure they have removed the option to sync app data to MI Cloud any how. No need to sync contacts, calendar or photos to the Mi Cloud if you don't want to either.
  • aces170 - Saturday, September 12, 2015 - link

    AT nice to see a review of a xiaomi phone, with the usual in depth perspective. You do have a lot of readers here in India, and we are glad you covered for the region. I don't understand the north American contempt for anything Chinese, especially since everything they use is made in China. Xiaomi is a good brand so far, as Joshua pointed out having the attention to detail that is lacking in Android world. I think you could have covered the audio bit more in detail as note pro shines in that department.
  • Margalus - Saturday, September 12, 2015 - link

    Most of it was not contempt for anything Chinese. Most of the complaining is simply because you have read thru lots of pages of details and reviews before you find out that this phone will not work with any carrier in the USA. That is the problem. Somebody asked for them to put a sentence in saying this at the beginning and then the comments fill up with arrogant Europeans screaming about "muricans" and their entitlement attitude. This is, and always was an American website. So if they start reviewing things that won't work in America, it's pretty simple to just say that at the beginning so that people don't waste their time reading about something that they can't use.

    They can also do the same if they review something for America that won't work in Europe or Asia so that people from those areas don't have to waste their time if they don't want to.

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