Battery Life

With each successive generation, the general trend in smartphones has been better battery life. At the high end, this is now partially gated by process node, as we see major leaps in battery life mostly coming from newer generations of SoCs running on 28LP, 28HPm, and 20nm SoC in the near future. Of course, the other direction to scale has always been battery size. This is usually most easily accomplished by simply increasing the overall device size because the total PCB area is generally constant. After all, once you have all the necessary chips that make up a smartphone, you don’t suddenly need more of them to enable a bigger version of a smartphone. Therefore, the battery can be a bigger proportion of the phone overall.

This means that the Ascend Mate2’s large size enables it to use a 3900 mAh battery, with a 14.82 WHr capacity. While I’ve used multiple phablets of similar size, none of them truly approach the level of battery capacity that the Mate2 does. Huawei even offers an accessory that allows for the Mate2 to charge other phones by drawing on the internal battery and converting it into a 5V power supply. This seems to be a feature of the TI BQ2419X charge controller on board.

At any rate, to evaluate battery life on smartphones and tablets, we run a specific workload of web pages looping endlessly until the device dies, with the display calibrated to 200 nits, with background services disabled in order to create a controlled environment.

Web Browsing Battery Life (WiFi)

In the WiFi test, Huawei sets a new record for battery life here, almost to a ridiculous extent. The Mate2 does around 73% better than the One (M8) in this test. A combination of the relatively low pixel density display, large battery, and low power SoC (Snapdragon 400, MSM8928) can explain how Huawei pulled this off.

Web Browsing Battery Life (4G LTE)

In the LTE test, while the result isn’t quite as game-breaking as in the WiFi test, Huawei still sets a new record. It’s around 48% higher than the result posted by the One (M8), and I suspect that part of the difference is due to the 28LP process that the integrated modem is built upon for the Snapdragon 400 (MSM8928), which would cause a noticeable increase in power consumption when compared to the modem in the Snapdragon 801, which is the same in design but built on a 28HPm process.

While battery life testing used to end at web browsing, we’ve now implemented more tests to see how devices perform under CPU/GPU stress tests run in endless loops. This is also run at 200 nits and controlled to ensure similar conditions from device to device. First, we’ll look at GFXBench, which does an endless loop of T-Rex until the battery dies.

GFXBench 3.0 Battery Life

Once again, we see the same pattern. A combination of the device’s massive battery, and the relatively low power consumption of the Snapdragon 400 platform makes this phablet set new records in our battery life test.

GFXBench 3.0 Battery Performance

In the end of run FPS, it appears that the Mate2 effectively doesn’t throttle over time for GPU, although performance in general is a bit lower as a product of the older operating system. A more powerful GPU would produce better FPS throughout the run, although thermal throttling is more likely and battery life will be worse during the test.

BaseMark OS II Battery Life

The next test is Basemark OS II on an endless loop. It’s almost a broken record now, but the Ascend Mate2 breaks our record for this test as well.

BaseMark OS II Battery Score

The sheer size of the device means that throttling is much less significant when looking at the final score recorded. This basically means that in most conditions, the Mate2 maintains performance without throttling. However, this is mostly a function of the low power SoC, and the trade-off is worse performance under initial conditions where all SoCs are usually not affected by thermal throttling.

Charge Time

Surprisingly, the sheer size of the battery didn't affect the charge time. The Mate2 charges around as quickly as a Nexus 5. This is mostly because the Mate2 can afford to spend more time drawing the maximum possible current, which compensates for the larger battery size.

In short, there’s not much else to say here. For those that want the very best in battery life, the Ascend Mate2 is as good as it gets, based upon all of the phones that we’ve tested.

Introduction & Hardware Performance
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  • Fergy - Friday, June 13, 2014 - link

    You don't buy purely on pricepoint. You find out what kind of phone you want and then look for the best price/performance ratio. If I want a phablet I will look at a few phablets like this one and note3. The question becomes: is note3 worth the extra premium?
  • Impulses - Friday, June 13, 2014 - link

    That's a generalization, and I can make the opposite case too: most people don't buy unlocked phones by paying full price upfront, and once you do you often have a price point already in mind (often something under $400).
  • PubFiction - Saturday, June 21, 2014 - link

    It still wouldn't hurt to throw other phablets in for comparison or controlled outgroups. And to be more fair they could do something like compare it to a note 2 or an older phone since many companies do not really have mid range phones they just have late model phones that are not midrange due to age.
  • dawheat - Thursday, June 12, 2014 - link

    This honestly seems like one of the worst reviews on Anandtech.
    - 1 line about the 720p resolution on such a large screen - 240dpi is so 2012 and easily seen on any web page
    - Pretty bad GPU performance
    - For phablets, put to shame by the Oppo or OnePlus phones which are not much more expensive but far more capable.

    Maybe a year ago this phone would be a worthwhile budget phablet, but Oppo and OnePlus have already shaken up the phablet market.
  • nevertell - Thursday, June 12, 2014 - link

    But it's a gr8 m8, m8, I r8 8/8.
  • coolhardware - Thursday, June 12, 2014 - link

    For someone that wants LENGTHY battery life without adding an extended battery (for Note2, Note3 etc.), this seems like a nice choice. The pixel density is low (it is very near the bottom) but for a quite capable unlocked phone the price is not bad IMHO.
  • SanX - Saturday, June 14, 2014 - link

    Totally agree. I couldn't believe to see Anand name on the top of this absurd review of such utter junk. Hey Anand, everything is fine there? Need an eye doctor or others too? Holly &&%$$, it's like i swimmed in the toulet at Engadget.
  • nrfitchett4 - Friday, March 20, 2015 - link

    have you even tried the phone? It runs surprising well. The only time it bogs down is after several hours straight of clash of clans with xmod running on top. The only crash I've seen is an occasional contacts crash (weird because I can't find any info on why, maybe other contacts being imported). It runs much better than my G2 at half the price. I bought it because I am no longer subsidizing or financing phones and I was tired of having to charge my "great battery life" G2 at work. I love the battery optimizations and how it tells you if apps are eating battery in the background instead of a bunch of nonsensical google services in the battery list. I noticed the 720p screen for the first day, and after that, I didn't notice it being grainy or pixelated.
    To each their own, but I find that the midrange market is prime for explosive growth because Android runs just fine on lower end hardware. Funny how lower end hardware is snapdragon 400 and 2gb of RAM...
  • cknobman - Thursday, June 12, 2014 - link

    Why dont you ever throw in the Nokia Lumia 1520 into these comparisons? Especially when you are looking at things 5.5+ inches?

    I'd love to see how my Lumia stacks up against some of these other phones.
    I have never done an official battery life test but everyday @7am I take it off the charger and @11pm I put it back on and it always has >50% battery life left.
    If I dont do any gaming or heavy downloading it will have >60%.
  • Duraz0rz - Thursday, June 12, 2014 - link

    No reason to not include the 1520/930/Icon camera in the comparison, at the very least, especially when he mentions the Lumias on the camera architecture page!

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