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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  • Ketzal - Thursday, June 12, 2014 - link

    Just a heads up, the results of your Nexus 5 web scores are WELL wrong. I ran the tests and received considerably better results than what's reported here in your tables. Obviously, Android and Chrome have moved on since the debut of the Nexus 5 last year. I believe you need to update your tables with some kind of statement to indicate test date as it's misleading and not a fair accurate comparison by date. I'm sure you tested the latest version of Chrome on the Huawei? Doesn't that immediately invalidate the table? I'm running stock 4.4.3 Android and ART. On another note, I'd love to see a performance graph update for each version of Android. I'm sure it would be very popular. Keep up the fantastic work. Reply
  • Impulses - Friday, June 13, 2014 - link

    ART isn't enabled by default is it... Reply
  • groundhogdaze - Thursday, June 12, 2014 - link

    Great battery life is a godsend for me. I've got so many gadgets that need charging that I'm almost to the point of needing to do triage on them. Reply
  • Electron? - Thursday, June 12, 2014 - link

    This came as a surprise, but it's great to see a phone that really pushes the boundaries on battery life.

    Really hoping your next review will be the LG G3. Anandtech is pretty much the only site that goes in-depth on battery life these days.
    Reply
  • JoshHo - Thursday, June 12, 2014 - link

    I hope it is too. :) Reply
  • dawp - Thursday, June 12, 2014 - link

    I have a prism2 from t-mobil which is a huawei device which I am generally been happy with, I'll have to look into this phablet when I bet a bit extraa cash. Reply
  • GNUminex_l_cowsay - Thursday, June 12, 2014 - link

    I find it odd that you write a review of a device where in you you compare it e to phones that I would consider consider competing devices. But, then you don't include those phones you mentioned in the benchmark comparisons. I'm wondering why you didn't include say the onemaxx or note3?2 or 1mini or moto g. 3 of the phones l mentioned you mentioned and all seem like better comparison points to me than the phones used in the charts. Reply
  • KillaKilla - Thursday, June 12, 2014 - link

    What happened with the photography? Anandtech has had good, or at the very least not bad, photography throughout for a decade or more, yet here it's mediocre at best, laughable at worst. One shot even has a reflection of the camera in it! Reply
  • rivethead23 - Thursday, June 12, 2014 - link

    I currently own a Note 2. Bought it used for around $200. (Swappa!) I'm not bothered by the 5.5 screen (and size) on the Note 2 and actually looked at the Mega but ultimately decided against it. Since reviewer began by speaking about the note series I was disappointed to see no comparisons to the note series. Someone else mentioned the Note 2 would have been a good point of comparison and I think it would be. Reply
  • nrfitchett4 - Friday, March 20, 2015 - link

    I bought my wife a note 3, brand new on swappa (not retail) and it was 450 dollars. This new on Amazon with 2 year warranty was 290. Its not really a fair comparison. Yes my wife's note 3 has a prettier screen, but that is about it. This is a solid midrange phablet and should be compared with other phones in the 200-400 new price point. Reply

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