Battery Life

The Honor 8 uses the same 3000 mAh (11.46 Wh) battery as the Huawei P9, which is an average size for phones with roughly 5-inch screens. For example, the Samsung Galaxy S7, whose 5.1-inch SAMOLED display is almost the same size as the Honor 8’s, has a similar 3000mAh (11.55 WHr) battery.

In our initial look at the HiSilicon Kirin 950 in the Mate 8 review, we were surprised by the SoC’s efficiency. Manufactured on TSMC’s 16nm FinFET+ process, its A72 CPU cores deliver almost twice the performance per watt of the A57 cores in Samsung’s Exynos 7420 at its maximum operating point. Part of this difference comes from the redesigned A72 core—ARM optimized nearly every block to reduce power consumption—while another chunk comes from HiSilicon’s efforts. The Kirin 950 is one of the better implementations of ARM IP we’ve seen.

To see how the Kirin 950 impacts the Honor 8’s battery life, we’ll run it through our standard suite of battery tests. To make the tests accurate and repeatable, we control as many variables as possible, including minimizing background tasks and calibrating each display to 200 nits at 100% APL.

Web Browsing Battery Life 2016 (WiFi)

The phone’s display is still the primary power consumer in our browsing tests, but the CPU gets involved too by loading and scrolling through a set of popular pages. In the Wi-Fi browsing test, the Honor 8 lasts almost 9 hours, around 2 hours longer than the OnePlus 3 and Xiaomi Mi 5.

Web Browsing Battery Life 2016 (WiFi): Average Platform Power (APP)
Phone Display APP (W)
Huawei Honor 8 5.2-inch 1080p IPS LCD 1.28
Xiaomi Redmi Note 3 5.5-inch 1080p IPS LCD 1.28
Galaxy S7 (E8890) 5.1-inch 1440p SAMOLED 1.38
Huawei P9 5.2-inch 1080p IPS LCD 1.40
HTC 10 5.2-inch 1440p IPS LCD 1.44
Galaxy S7 (S820) 5.1-inch 1440p SAMOLED 1.51
OnePlus 3 5.5-inch 1080p AMOLED 1.62
Xiaomi Mi5 Pro 5.15-inch 1080p IPS LCD 1.72

The average platform power (APP) figures in the table above are a rough estimate of each phone’s average power consumption, extrapolated from total runtime and battery capacity, and are not measured quantities. These values are just a different way of visualizing the data in the chart after normalizing for battery size.

We can see the Honor 8 does quite well in this test, generally consuming less power than the phones using the Snapdragon 820 SoC. There’s some variation due to display size and type, but the Honor 8 averages between 11% less than the HTC 10 and and 26% less than the Xiaomi Mi5 Pro.

Web Browsing Battery Life 2016 (LTE)

Switching over to the LTE radio, the Honor 8 still manages to last just over 8 hours, only about a 9% drop relative to using Wi-Fi. The HTC 10 and Galaxy S7 with Snapdragon 820 show even less change in total power consumption, allowing them to close the gap with the Honor 8. The Huawei P9 actually lasts 2% longer in the LTE test, jumping over the Honor 8, but the difference is small enough that it falls within the error level of these tests.

PCMark - Work Battery Life

PCMark - Work Performance Overall

The Honor 8 is no match for the Redmi Note 3 and its big battery in PCMark, but it still lasts more than 8 hours, placing it among the best flagship phones. It manages this feat while still delivering very good performance too. With 8 hours of screen on time while running a continuous workload, the Honor 8 should have no problem lasting a full day on a single charge for most people.

The Honor 8 does manage to last a few minutes longer using its Smart battery mode, but the difference relative to the Performance mode is negligible. This is not all that surprising considering that the Smart mode seems to primarily affect the target frequency for the lower-power A53 cores, dropping it from 1.5GHz to 1.3GHz in moderate workloads. This small power savings is overshadowed by the display, but its 9% impact on overall performance is easier to see. There does not seem to be much advantage to using the Smart mode, at least not for the types of workloads used by PCMark.

GFXBench Manhattan ES 3.1 / Metal Battery Life

GFXBench Manhattan ES 3.1 / Metal Final Frame Rate

In the GFXBench Manhattan 3.1 battery life test, which predicts runtime while playing games, the Honor 8 lasts 3.5 hours, an average result that turns disappointing when you factor in performance. The LG G5, for example, lasts just as long but delivers 38% better peak onscreen performance, which extends to almost 100% by the end of the test. Granted, the G5 is a more-expensive phone, but even the Xiaomi Redmi Note 3 Pro, which is around half the Honor 8’s price, lasts 42% longer, with the help of its large battery, and while the Honor 8’s peak performance is 16% better, its sustained performance is less, with a final frame rate almost half of the Redmi’s value.

The Honor 8 is able to maintain peak gaming performance for 42 minutes in GFXBench Manhattan 3.1 before it’s forced to reduce GPU frequency to avoid overheating. Frame rate then oscillates wildly between 8-11fps until a series of forced battery saving steps kick in, which cannot be disabled. The first step occurs at the 2.4 hour mark when the battery level hits 30%, reducing frame rate to 8-9fps. The next step occurs just past the 3 hour mark when the battery level hits 10%, with the final step occurring at 3.3 hours with only 4% charge left, dropping performance to 4.8fps.

I’ve also included the P9’s performance stability graph for comparison. It starts throttling GPU frequency only 22 minutes into the test, so the Honor 8 maintains near peak performance for nearly twice as long. The P9’s performance is much more stable, however, avoiding the Honor 8’s big oscillations. It still goes through the same series of steps where it reduces GPU frequency to save battery power. The step with 30% charge remaining is not really noticeable because performance is already in the 9fps range. When the battery level hits 10% 2.9 hours in, it reduces performance to the same 6.4fps level as the Honor 8, and then down to 4.8fps with 4% charge left at the 3.1 hour mark.

Battery Charging

Charge Time

The Honor 8 includes a fast-charging system that incorporates Texas Instruments’ MaxCharge components, including the BQ25892 battery charger IC that implements battery temperature monitoring and overvoltage/overcurrent protections. The included wall charger is rated for 5V or 9V operation at 2A for a theoretical maximum of 18W at the wall and about 12W at the battery.

The Honor 8 oscillates between 8.5-12W for the first 37 minutes of charging. It then holds at a fairly constant 8.5W for another 20 minutes before tapering off quickly into a trickle charge. This charges the battery to 25% in 15 minutes and to 50% in 32 minutes. It reaches a full charge in 2.2 hours. As a side note, Huawei claims the Honor 8 reaches 47% charge in 30 minutes, which is exactly what I measured. It still does not charge as quickly as the Galaxy S7 or some other phones, but it still charges plenty fast.

GPU Performance Final Words
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  • TheinsanegamerN - Thursday, October 13, 2016 - link

    Why dont these companies use a T880-MP6 instead of a MP4? It never makes sense why they skimp on the GPU, but make a powerful CPU. Reply
  • mmrezaie - Thursday, October 13, 2016 - link

    probably the same person who choses the glass on back of the phone makes that decision! One wonders... Reply
  • Lolimaster - Friday, October 14, 2016 - link

    Put glass behind for more premium feel, --> everyone sees those nasty fingerprint grease, is that premium? Reply
  • zeeBomb - Sunday, October 16, 2016 - link

    Yo I ship it! Reply
  • dsumanik - Monday, October 17, 2016 - link

    Better than overpriced iShit, and you can still use headphones. Reply
  • utferris - Thursday, October 13, 2016 - link

    These phones are usually sold to poorly educated people. And they are educated by the market that the more cpu core, the better phone. So people would usually prefer this SoC rather than Snapdragon 820, because Huawei has twice the CPU core number.

    You may think it is crazy, but it is the fact in the offline-market of China.
    Reply
  • negusp - Thursday, October 13, 2016 - link

    You seem poorly educated yourself; the Kirin 950 is, in most cases, faster then the 820, while being just or more efficient. Reply
  • lashek37 - Thursday, October 13, 2016 - link

    The original Nokia is faster than this phone Reply
  • oynaz - Friday, October 14, 2016 - link

    Without a doubt. To be fair, the original Nokia was a rubber boot. Reply
  • Ethos Evoss - Wednesday, October 19, 2016 - link

    which u won't buy .. another pathetic/naive child who talks about pointless performance and won't buy them.. what is even point you to comment ?!?? Reply

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