Battery Life

Battery life is one of the most important aspects of any mobile device, especially because the battery is what defines mobility to begin with. As a result, it’s important to test battery life in a meaningful manner. This requires a repeatable test with standardized conditions, and a range of scenarios that stress different aspects to get the full picture. Most importantly, for tests that have the display on we calibrate the display to 200 nits to ensure that the test doesn’t penalize brighter displays. In the case of the Galaxy Note 4, we see about a 3% gain in battery capacity, so most of the battery life gains should come from higher efficiency.

Web Browsing Battery Life (WiFi)

Our first test is the WiFi web browsing test, which loads a given set of web pages in a loop, with special emphasis taken in order to ensure that the test doesn’t penalize faster SoCs, which would have significant effects on our results. As one can see above, the Galaxy Note 4 has a noticeable uplift in battery life when compared to the Galaxy S5 and lasts significantly longer than the Galaxy Note 3. It doesn’t last quite as long as the iPhone 6 Plus, but few people should have issues getting through a full day of intensive use.

Web Browsing Battery Life (4G LTE)

On LTE web browsing, a similar story plays out as the Galaxy Note 4 is able to keep up with the competition and delivers the massive improvement that we’ve generally seen from the transition to Snapdragon 801 and 805.

While the web tests are well-worn by now, we’ve added two additional tests to the battery life suite in order to get a better picture of SoC-bound battery life. To this end, we use an infinite loop of T-Rex on-screen to replicate a GPU-intensive scenario and Basemark OS II’s battery life test to simulate a CPU-intensive scenario.

BaseMark OS II Battery Life

BaseMark OS II Battery Score

In the case of the Basemark OS II test, we see that battery life under a sustained task ends up a bit lower than we expect, which seems to suggest that in CPU-bound tasks the Note 4 doesn't have much better efficiency when compared to the Galaxy Note 3. This seems to be self-evident, as the CPUs are quite similar and the process technology used is largely similar when comparing the two devices.

GFXBench 3.0 Battery Life

GFXBench 3.0 Performance Degradation

In GFXBench's endless rundown test we see that the Galaxy Note 4 trails behind in battery life when compared to the GS5 LTE-A, but looking at the end of run FPS it’s quite clear that the Galaxy Note 4’s larger surface area makes it possible to achieve greater performance.

Overall, battery life is quite good on the Galaxy Note 4. It’s a massive leap forward when compared to the Galaxy Note 3, but a relatively small one when compared to the Galaxy S5. Once again, we see that most of the benefits in battery life will come from scenarios where power draw isn’t strongly influenced by the display.

Charge Time

As a part of the overall battery life story, it's important to consider the time it takes for a battery to fully charge. If a phone's battery charges slowly then scenarios where charge time becomes crucial will severely hurt real-world battery life. For example, if one forgets to charge their phone at night, the rate at which the phone will charge the battery is a strong influence upon actual battery life. In order to test this, we measure power draw from the time that the device under test is plugged in until it reaches a given level of power draw that indicates that the battery is fully charged.

Charge Time

As one can see in the graph above, the adaptive fast-charge mechanism really works, although I don't see a huge benefit when compared to the Galaxy S5's charge time which was already incredibly fast. In the case of the Galaxy Note 4 it seems that it switches between a 9V, 1.64A mode and a 5V, 2A mode as needed, and most of the benefit would come from the first 50% or so of charging as power drops rapidly as the battery approaches full charge.

Software: TouchWiz UX Display
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  • BPB - Wednesday, October 15, 2014 - link

    Where are the final comments? Reply
  • JoshHo - Wednesday, October 15, 2014 - link

    Apologies, things were a bit hectic in order to meet the embargo. The conclusion is done but some aspects are still incomplete. I should be finished within the next hour. Reply
  • Try-Catch-Me - Wednesday, October 15, 2014 - link

    Anand would never allow this. Reply
  • CoreDuo - Wednesday, October 15, 2014 - link

    Except it did happen even when Anand was around. In a few GPU reviews by Ryan Smith and when Brian Klug wrote the smartphone reviews, they did on occasion go up incomplete when there was not enough time between when they got the products to review and the embargo date. They have always been finished within 24 hours of publication though. Reply
  • Try-Catch-Me - Wednesday, October 15, 2014 - link

    Relax. I'm just making a joke like how people kept saying "Steve would never allow that". Reply
  • kron123456789 - Thursday, October 16, 2014 - link

    LoL. Turns out, that New Exynos 7 Octa and Exynos 5433 in Note 4 are the same SoC))
    http://www.samsung.com/global/business/semiconduct...
    Reply
  • Andrei Frumusanu - Friday, October 17, 2014 - link

    They just decided to market the 5433 as a Exynos 7 series, however there are more in the 7 series (7420) coming out as pointed out in my article. Reply
  • noelbonner - Tuesday, November 11, 2014 - link

    There are a number of higher rated phones, I recommend seeing http://tinyurl.com/p7dujj9 among others. Reply
  • windycity23 - Monday, November 09, 2015 - link

    Or better yet, check out one of these http://tinyurl.com/qzz8a8y - quick and easy to read. Reply
  • Ramon Zarat - Monday, October 20, 2014 - link

    http://en.wikipedia.org/wiki/Joke
    http://en.wikipedia.org/wiki/Humour
    http://en.wikipedia.org/wiki/Laughter

    A joke you say? Don't quit your day job just yet to become a comedian because I don't see any joke here as I failed to get the humor and I'm not laughing either. Next time, put a smiley or something so we can decipher your cryptic intentions: ;)
    Reply

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