Battery Life

Unlike most subjects that need significant explanation to justify the rigor of testing, battery life is something that everyone can appreciate. However, for those that are unfamiliar with our testing, we make it a goal to produce a repeatable, realistic test. In order to do this, our web browsing test runs a loop of webpages that ensures all power states with the screen on are properly represented in the test. In order to control for extraneous variables we standardize display brightness to 200 nits with strong signal.

Web Browsing Battery Life (WiFi)

When running the web browsing test on WiFi, we see that the new Moto X manages to regress in battery life from the previous Moto X. This is a bit of an expected result as only the newer process of the SoC and new display technology can offset the decrease in battery size. In the LTE comparison there's a great deal more complexity as the previous Moto X had a less power efficient modem and RF front-end. The new Moto X has the same WiFi chipset as the previous Moto X, which is Qualcomm's WCN3680.

Web Browsing Battery Life (4G LTE)

On LTE, the new Moto X is noticeably trailing behind the rest of the competition. Here we see that battery life is just behind the LG G2, but behind all recent Apple iPhones and just about every other Android high-end flagship phone launched in 2014. While the new Moto X has definitely improved over the previous Moto X, it seems that Motorola has used the newer AMOLED panel and lower power SoC to avoid using a significantly larger battery.

However, web browsing is not the only scenario worth testing. As the web browsing test is largely dominated by display power, it’s important that we test scenarios where all the other subsystems are more dominant in the power equation. For this, we turn to Basemark OS II and GFXBench 3.0, which focus more on CPU and GPU power consumption.

Unfortunately, I could not get our GFXBench rundown test to complete despite multiple attempts as it seems that the phone would either reboot or kill the application. Looking at the logs for the rundown test reveals that there’s no real change in FPS from run to run. After some extra investigation, it seems that this build (KXE21.187-43) doesn't do any throttling on GPU, so any workload that can keep the GPU at maximum heat output without dependence on CPU can cause the phone to reach unacceptable temperatures.

At any rate, the Basemark OS II run did complete so we can look at that.

BaseMark OS II Battery Life

BaseMark OS II Battery Score

Unfortunately the Basemark OS II test reveals that battery life is poor compared to the competition. Normally, low battery life is compensated for by high performance but the battery score is only above the Sony Xperia Z1s and Huawei Honor 6, and the latter had no power budgeting mechanisms on the SoC to keep battery life at acceptable levels.

Overall, it’s hard to really say much in the way of praise for battery life. While it’s definitely surprising just how much battery life Motorola has achieved given the size of the battery and display, I suspect that Motorola found themselves in an uncomfortable situation as they tried to deliver a bigger display while keeping the phone easy to use with one hand. I suspect that all things considered, Motorola would have been better off if they went for a smaller display and the smaller height and width that would logically follow. It’s also not that the battery life is bad in an absolute sense, but it isn’t as good as its peers. Motorola is likely tracking closely to their estimated 24 hours of “mixed usage”. The use of Moto Display will also go a long way to reduce the time with the AP and display on.

Before I conclude this section, I just wanted to note that Android L alone won’t improve battery life on these tests. Android RunTime (ART) won’t help with battery life as these applications are native code. Job Scheduler is also irrelevant to our tests, as it will only improve battery life in situations where multiple applications are running in the background. We make every effort to ensure that no background tasks occur during these battery life tests and auto-sync is disabled as well in order to make sure that the only task running is the one under test. We have already run the data early in the summer on the Nexus 5 with Android L developer preview and our data does not show any significant difference in battery life. However, in real world usage where background applications and data syncing are active, one can expect greater battery life with Android L but only in the range of 10-15%.

Charge Time

While battery life from full charge to no charge is critical, in many situations the reverse is also important. For example, if one only has an hour before a flight, the rate at which the battery charges is just as important as the rate at which it discharges in use. In order to test this, the phone is connected to the included charger and the time from the battery begins charging to the time the charger stops drawing significant power is measured, as charging LEDs can often be an inaccurate method of determining charge time.

Charge Time

Motorola ends up on the high side here, which is somewhat expected due to the relatively small battery. I'm surprised that this is possible with a 5V, 1.15A charger though.

Software: AOSP UI Display


View All Comments

  • knightspawn1138 - Wednesday, September 17, 2014 - link

    We all know that nobody is allowed to release a review of an Apple product until the ghost of Steve Jobs has had a chance to convince the reviewer that there's something groundbreaking about a phone that's following all the same trends as the rest of the smartphone field (bigger display, less power draw from a smaller, more efficient SoC, and more room for a larger battery). And he has yet to convince me that a smartphone is worth Apple's price without expandable memory. Reply
  • darwinosx - Wednesday, September 17, 2014 - link

    You don't know anything about iPhones.
    Most Android devices don't have expandable memory.
    The latest iPhones goes to 128GB of fast and reliable contagious memory.
    Google does not want Android phones to have expandable memory because they know it sucks.
    Why did you post if you don't know anything?
  • sprockkets - Wednesday, September 17, 2014 - link

    Speak for yourself apple troll. All you ever do is troll any article dealing with Android.

  • Kenneth2011 - Thursday, September 18, 2014 - link

    I don't think I want any contagious memory, reliable or otherwise... My own is quite enough, thank you. Reply
  • probedb - Thursday, September 18, 2014 - link

    No phone has expandable memory that I know off, you can't just put a couple of sticks of DDR3 in a phone. Some Android phones have a memory card slot, that's it. Reply
  • lypanov - Thursday, September 25, 2014 - link

    I just wanted to inform you that as blatantly nonsensical as your claims are, and as bad as the products you defend are for many use cases... it's not possible to get cooties from iPhones. Reply
  • alex2 - Friday, September 19, 2014 - link

    That is so not true. I have no idea where you get your info from.. The device is not even out for testing yet. That's the real reason. Not the shit android fanboy info you just spat out. Jesus.. That's a new low... Also, remember that you started this when it wasn't even called for. And no, I'm not an apple fanboy in case you get the idea to reply with that juvenile nonsense. Writing this from my Moto G! Reply
  • DeciusStrabo - Wednesday, September 17, 2014 - link

    Anand surely could have hooked up his old site with a few phones...

    Review embargo for pre-release phones all the sites Apple likes have gotten has been lifted today.
  • ruggia - Wednesday, September 17, 2014 - link

    it's quite rare for Anandtech to release mobile reviews at the day of embargo lift (including this one)

    good things take time. it always has.
  • dsraa - Wednesday, September 17, 2014 - link

    Seriously no cares that you are 'first'. Even if you are being sarcastic, which is how your comment reads, it still doesn't matter, and no-one still cares....and yes I took the time to write this, but only because I am generally annoyed at this current trend of idiots who still think commenting 'first' is actually col, and to gloat about, as if it really matters........

    Then there's the slight slight possibility that you made the comment just to annoy others, which for that I can see the valid logic. :)

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