Battery Life

Continuing to the battery life benchmarks we should expect the Mate 8 to perform very well, thanks to the high efficiency of the Kirin 950, an LCD screen as well as the 4000mAh / 15.2Wh large battery.

Web Browsing Battery Life (WiFi)

Starting off with our WiFi web-browsing test we see the Mate 8 just get short of 13.5h of battery life. The interesting comparison is here to last year’s Mate 7 as it seems the actually last just as much. This may point out that the screen efficiency measured in our display power testing was maybe correct and the Mate 8 is less efficient. Another aspect is that the Mate 8’s overall platform power consumption hasn’t seen much improvement and thus still represents a large barrier for battery life.

Web Browsing Battery Life (4G LTE)

On the 4G LTE test we see that the Mate 8 loses out its advantage over the competition. Again I’m testing under rather mediocre signal conditions so it’s not a valid apples-to-apples comparison to devices reviewed by Joshua or Brandon, however when comparing it against for example such as the Nexus 6P which was tested under the same conditions we see that the Mate 8 faces a much larger battery life degradation going from the WiFi to the LTE test. The reason for this can only be that the Kirin 950’s modem and RF back-end just aren’t as efficient as Qualcomm or even Samsung’s.

PCMark - Work Battery Life

While the web-browsing tests didn’t represent a large improvement for the Mate 8, we see PCMark put the phablet as the current undisputed leader among high-performance devices. Here the difference to the Mate 7 is almost 4 hours, or around a 65% increase in battery life. The increase is most certainly linked to the new SoC’s power efficiency.

BaseMark OS II Battery Life

BaseMark OS II’s battery test is more of a maximum load type test that depends on the allowed maximum TDP of the phone. With a 15.2Wh battery and a runtime of 4.2h we see an average consumption of 3.6W, roughly the same amount of power that I saw that the device was able to sustain in our CPU thermal test.

GFXBench 3.0 Battery Life

Finally the GFXBench battery test shows that the Mate 8 doesn’t show very good battery life but this is a two-edged sword. As we’ve seen in the GPU section the SoC hardly throttles under heavy GPU load and thus retains its maximum performance for the duration of the test. Considering that the Mate 7 slowed  throttled down to 9-10fps and the Mate 8 does not go under 40fps, it still shows that the Mate 8 is twice as efficient as the Mate 7 even though overall battery life is almost twice as short.

At 200 nits the Mate 8 averages an idle power consumption of 989mW and we saw that system load power for the T-Rex test is 3.64W. 3 hours battery runtime averages 5W of power, near the 4.6W we theorized. The small difference may be due to the overhead of actually running the on-screen test and thus also not able to show the DDIC’s savings thanks to PSR due to continuously changing screen content.

Overall I’ve been extremely impressed by the Mate 8’s battery life. In everyday usage this is the longest-lasting device I’ve had the opportunity to use. The Kirin 950’s efficiency is outstanding and is truly able to earn its place among the top for this generation. It seems the Mate 8’s limiting factors are related to the screen and general platform base power consumption, something that Huawei may be able to improve in future devices and thus get even better value out of the Kirin 950.

All being said, if you’re looking for a long-lasting device, you can’t go wrong with the Mate 8.

Charge Time

The Mate 8 advertises fast charging out of the box so that even considering it having a large 4000mAh battery, it should still be fast to fill up when in need. The stock charger is a 9V/2A (18W) unit. I’m not sure if the charging enumeration protocol is based on Quick Charge or Adaptive Fast Charging, but it was able to enable fast-charging on Samsung phones while the Mate 8 didn’t fast-charge on Samsung’s charger, meaning the Huawei charger is likely a Quick Charge unit and the Mate 8’s PMIC and voltage negotiation IC seems to only accept Quick Charge.

Charge Time

As we see in the charge graph, the Mate 8’s battery cell gets charged at up to 11.5W during the fast-charging phase, being able to reach 80% in 68 minutes around little under 40% charge for each half hour of charging. The last 20% takes up to another 70 minutes as the device switches over to trickle-charging.

While the Mate 8 ends up with total charge time of 2.56 hours, what counts is that the initial 80% of battery capacity can be charged very fast so the Mate 8 is no slouch in this metric.

Display Measurement & Power Camera Still Picture Performance
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  • zodiacfml - Thursday, January 7, 2016 - link

    On the second thought, it might not be at all as the next exynos and snapdragon will have slightly higher cpu performance but a lot larger gpu performance which will be coming in a few mionths. And on a Samsung, it has more polish and maturity at the same price. Reply
  • s.yu - Saturday, January 16, 2016 - link

    You're right. S7 is right on the Horizon and it will be massively superior in most aspects to this, though they're not completely comparable as the size difference makes for different battery life and heat dissipation, and maybe even signal strength. Reply
  • grrrgrrr - Friday, January 8, 2016 - link

    Mate 8 user here. Under light usage a single charge lasts 3~4 days easy.

    I really couldn't parse the battery life benchmarks when I have to charge a device rated 70h every day and another rated 100h lasts 4 days.
    Reply
  • p51d007 - Friday, January 8, 2016 - link

    I've been using a Mate2 since May 2014, the 5.1 update came June 2015. 100% satisfied with it and the performance. I'm not a gamer, but I do a ton of phone, text, web, PHOTOS, etc. Battery life is still outstanding. It's the most stable phone I've owned since my Star-Tac phone. Stays on 24/7, never gets rebooted, no FC, lockups NOTHING. Now, that being said, I wouldn't mind getting the Mate8, but I'm sure not going to shell out the bucks they want for one. The Mate2 was the perfect performance/price point, but it appears that Huawei wants to go all Apple/Samsung pricing. You think consumers, use to the iphone/Galaxy line are going to shell out that kind of money on a virtual unknown? Not going to happen.
    Personally, all these high end SOC devices are worthless to the bulk of consumers in the first place. Most users, other than the high end benchmark nuts or gamers aren't even going to come CLOSE to utilizing that much horsepower for a phone. Looks like I'll stick with my Mate2 a while longer til it dies. Forking over almost $1,000 for a stupid phone is NUTS, especially when the Mate2 only cost me $300 bucks almost 2 years ago (and now is even less!)
    Reply
  • s.yu - Saturday, January 16, 2016 - link

    Oh please, Mate S and P8 were much much worse phones for a similar, or higher price. They really want to go Apple pricing, I can see they want to so bad from their Mate S pricing, but they're not there yet so they reverted to a sane price level with the Mate 8. Lucky you, for the meantime. Reply
  • milli - Wednesday, January 13, 2016 - link

    Last page:
    ' I’m now eagerly looking forward to testing the Snapdragon 820’s Kyro and Samsung’s Exynos 8890’s M1 to see ...'

    KRYO
    Reply
  • Rdmkr - Wednesday, January 13, 2016 - link

    The 78% screen to body ratio made me somewhat excited for this device. I think it's the highest found on any phone, shared only by lenovo's vibe Z2 Pro and some Sharp Aquos models. Of course this only expresses the relative bezel size, which is helped by the high overall size of the phone. The Sharp Aquos phones are king in terms of absolute bezel size. The Vibe Z2 Pro gets a special mention for squeezing capacitive buttons on the tiny bottom bezel as well. Reply
  • doyleconan - Monday, February 1, 2016 - link

    Is there any updates on the camera focus issue? Reply
  • KCKY - Thursday, February 18, 2016 - link

    Any news yet on the Camera update ? :) Reply
  • DaveTheWave - Wednesday, February 24, 2016 - link

    How about a refreshed camera test?
    Haven't there already been updates that improved the camera?
    Reply

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