Motorola Moto E (2nd Gen) Review

Battery Life And Thermal Throttling

Battery life may be the most important performance metric for a mobile device. After all, it does not matter how quickly a phone or tablet can load webpages or how many frames per second the GPU can crank through once the battery runs down and the device shuts off. To learn more about how we test this critical facet of mobile computing, please read our battery testing methodology article.

The Moto E (2nd gen) comes with a 2390mAh battery, which is 21% more capacity than the 1980mAh battery inside the original Moto E. This gives the Moto E a larger battery than both the second generation Moto G (2070mAh) and Moto X (2300mAh) as well as the Lumia 830 (2200mAh), all more expensive 5-inch class phones.

Combining a large battery with a smaller 4.5-inch display gives the Moto E just over 8 hours of battery life in PCMark, a 59% advantage over the Moto G. Not only does the Moto E last longer than the G on a charge, but it actually offers slightly better performance while doing so. While the Moto E lacks panel self refresh, which is a hardware feature that saves power when displaying a static screen, it does not seem to hold it back in this test.

The Basemark OS II battery test is sort of a worst case indicator of battery life under CPU intensive workloads. While the Moto E (2nd gen) fares better than the other devices we are comparing it to, it only outscores the Moto G (2nd gen) by 8.2%, far less than the 59% advantage we saw in the more realistic PCMark load cases, despite having a 15.5% larger battery and smaller screen.

Because this is primarily a CPU test, we can use it to get a rough estimate for the difference in power efficiency between the A7 and A53 cores running at the same frequency and built on the same 28nm LP process node. Comparing the difference in score to the difference in battery size shows that at a system power level, the Moto E is 7.3% less efficient than the Moto G. The Moto G’s system power draw will be slightly higher than the Moto E because of its larger screen, giving the A7 CPU core a greater than 7.3% performance per watt advantage over the A53 core (We did not get a baseline power draw before we had to return our evaluation units, but after accounting for the difference in screen size, this figure should be in the 10-20% range.). This tells us that ARM has reached a point of diminishing returns trying to get extra performance out of the narrow, in-order A7/A53 architecture, and probably why we do not see a new LITTLE core to accompany the A72.

In the GPU and gaming focused GFXBench 3.0 battery test, the Moto E keeps the fun going for 7.8 hours, which is more than double the 3.5 hours for the Moto G. The Moto E’s lower GPU frequency and resolution (this test is rendered onscreen) provide the edge in battery life. The lower resolution also helps with performance, allowing it to post better frame rates than the Moto G and Lumia 830.

The Adreno 330 in the HTC Desire Eye provides 1.8x the performance (after some thermal throttling) of the Moto E, but there’s a price to pay: it only lasts for ~3.5 hours compared to the 7.8 hours of the Moto E.

The battery drain and performance graph from the GFXBench battery test shows no hint of thermal throttling over the 28 minute duration of the test, since the performance remains constant the whole time.

Using the device in the real world, it’s quite obvious that the latest Moto E has significantly better battery life than the Moto G (2nd gen). With moderate use it lasts about a day or more longer than the Moto G (so two or three days total). With light use it should last three or four days. If that’s not impressive enough, the device can easily last a week in idle mode.

As you can see above, even with 70% battery charge left, it should still last another week. However, it should be noted that the device was on minimum or less than half brightness levels the whole time.

The bottom line is that the Moto E (2nd gen) has great battery life. The combination of an efficient SoC (even if Cortex-A53 is slightly less efficient than Cortex-A7), a relatively low resolution, a small screen (at least by today’s standards), and a large battery gives the new Moto E the edge over most smartphones on the market.

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17 comments
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  • emad_ramlawi
    Lenovo k30-W for the win
    all the above +
    HD ready resolution 720p
    internal storage 16GB
    the only con, is there OS, which is good, but not really vanilla android
  • atljsf
    i bought one and had to return it, it restarts while charging and motorola at this moment hasn't solved the problem, a shame because it is a nice fast phone
  • tekelymailcom
    The only international variant mentioned is the XT1505 but there are more. I found very interesting the XT1523 which has 16GB, dual sim and digital TV reciever.
  • HideOut
    There might be an error in the speaker/sound part above. "Plugging in a set of good headphones provides a similar listening experience. Relative to the iPhone 6, bass has less punch and the Moto E lacks clarity; the signal-to-noise ratio seems higher." The S/N ratio on the Moto E should be LOWER, not higher if it sounds like its lacking clarity.
  • HideOut
    There might be an error in the speaker/sound part above. "Plugging in a set of good headphones provides a similar listening experience. Relative to the iPhone 6, bass has less punch and the Moto E lacks clarity; the signal-to-noise ratio seems higher." The S/N ratio on the Moto E should be LOWER, not higher if it sounds like its lacking clarity.
  • HideOut
    site posting is not working well...Either nothing or multiples
  • MobileEditor
    Quote:
    The S/N ratio on the Moto E should be LOWER, not higher if it sounds like its lacking clarity.


    Good point. I must have been thinking of THD, which is expressed as a percent. I've made the necessary correction.

    - Matt Humrick, Mobile Editor, Tom's Hardware
  • Dr3amCast
    I also purchased this phone and experience the restart while charging issue. Also, the performance is on par with a very, very basic Lumia 510 I had the misfortunate of having to use for a short time. The phone chugs while multi-tasking. And I mean by just hitting the home screen instead of closing out of apps. And even that takes an inordinate amount of time. I'm talking a noticeable 3-4 seconds after you hit home: your background wallpaper shows up, but no icons or app try icon, then another second or 2 later the icons show up. It's performance is dreadful. As well is its 1GB of memory. If I'm in the car I use bluetooth and Google Play Music / Google Maps. If I begin navigating to a destination and begin playing music Maps will close. I'm assuming due to lack of sufficient RAM. If I'm at a stop light and open snapchat, Google Play Music, Maps or Waze will close if I view a Snap. It's really rather frustrating the more you use the device. And I don't have many apps on here at all. Essentially just FB, Twitter, Snapchat, Waze, WatchESPN, HBOGo. That's all. It's frustrating seeing reviews like these on this phone that don't actually put it through its paces for a decent amount of time.
  • MobileEditor
    Quote:
    I also purchased this phone and experience the restart while charging issue. Also, the performance is on par with a very, very basic Lumia 510 I had the misfortunate of having to use for a short time. The phone chugs while multi-tasking.


    I'm sorry you had a poor experience, but thanks for taking the time to add your story. This is why we included the HTC Desire Eye in our performance evaluation, so our readers could see the performance delta between some lower-cost devices and last year's flagships running Snapdragon 801 SoCs, which are now considered mid-tier.

    Our unit did not experience the restart while charging issue, and while this comes as no solace to you, the Moto E handled its 1GB of RAM better than the Lumia 830 did during our testing and evaluation.

    - Matt Humrick, Mobile Editor, Tom's Hardware
  • quadrider21
    I've experianced BT connectivity problems with both the Moto G and this new Moto E when connected to various cars. I'd be wary purchasing these phones if you rely on BT connectivity in your cars.
  • MyDocuments
    Interesting reading and thanks for the review.

    I bought the original Motorola-E (3G) for an older family member as a replacement for their aging Nokia clamshell phone that barely managed a days life depite having a new battery. The problem was not only living in a relatively weak signal area but more that it was constantly running Bluetooth whilst being paired with a car-stereo for hands-free operation. Therefore I assumed that a more modern cellphone with a newer Bluetooth implementation could last a whole lot longer.

    After extensive internet research I dicovered that the original Motorola-E had very good battery life (a few day of talk time) and very good call-quality, and seeing as said family member was likely to be using it mainly for calls I could assume that the internet-reviewed (hammered!) battery-life could thus be extended, and indeed this was proven correct.

    At that time and around 90-100 GBP from the local Argos & SIM free I considered it a cheaper alternative for a mainly calls, minimum data use (unless at home on the WiFi of course - I'm thinking of updates), small-ish, slightly rugged; Gorilla-Glass, removable back-cover and serviceable (replacement batteries). A throw in the bag type mobile that might survive a re-shuffle with other items in said bag (keys, pens, loose-change, etc.). It also uses a (charger not supplied) standard micro-USB connector for charging, so the car-charger and home-charger can be any number of generic cheap types. Thieving was another consideration, hence a cheaper-end phone hopefully providing a less attractive target.

    A chubby-stylus was added for less that a pound, the type that can be attached with a small line to the headphone socket for safe keeping, as older family members tend to have drier skin and so touch screens aren't always as accessible to them.

    The only thing missing iirc was the camera light that can be a handy aid on dark nights, however to mitigate that the main-screen illumination can also be sufficient for emergency use.

    I have to say that I am still pleased with the original Motorola-E purchase and have to wonder how the battery life compares with light useage when the newer model likely required a larger battery due to the faster processing power and extra electronics that it now facilitates, some can be switched off I know but always leaking power.
  • tstng
    I have an issue with the Battery Life tests you've done. The new 2015 Moto G uses the same 2390mAh as the new Moto E, and not the 2070 mAh. The 2070 mAh is used in the old Moto G versions. So, while the 4.5in screen of the Moto E would increase battery lifetime over the 5.0in Moto G, the difference should not be that big.
  • MobileEditor
    Quote:
    I have an issue with the Battery Life tests you've done. The new 2015 Moto G uses the same 2390mAh as the new Moto E, and not the 2070 mAh. The 2070 mAh is used in the old Moto G versions. So, while the 4.5in screen of the Moto E would increase battery lifetime over the 5.0in Moto G, the difference should not be that big.


    The Moto G (2nd gen) has a 2070 mAh battery according to Motorola, and this is the model we tested. I should have used the generation nomenclature (like in the text) in the chart rather than the year to avoid confusion.

    - Matt Humrick, Mobile Editor, Tom's Hardware
  • tstng
    There are currently 4 versions of the Moto G:

    The original, released in Nov 2013, which had 4.5in screen, 5 mpx cam, and 2070 mAh
    The updated one, released in May 2014, same specs except had storage expansion and LTE, same 2070 mAh.
    The first 2nd gen, released in Sep 2014, which had 5in screen, 8 mpx cam, no LTE, same 2070 mAh.
    The updated 2nd gen, released in Feb 2015, same as above, except has LTE and 2390 mAh. This is the one you should have been reviewing, but i guess you mixed them up. Dont believe me, here's the comparison of the last 3 versions (the original excluded cause the site can only compare 3 at a time)
    http://www.phonearena.com/phones/compare/Motorola-Moto-G-LTE,Motorola-Moto-G-2014,Motorola-Moto-G-LTE-2015/phones/8655,8898,9155

    And before you say that site has it wrong, ALL proper reviews comfirm it has 2390 mAh battery, and decent battery life span in tests backs this up. And I even checked at my usual online shop and confirmed it as well.
  • MobileEditor
    Quote:
    There are currently 4 versions of the Moto G:


    While a 4G version of the Moto G (2nd gen) with a larger 2390 mAh battery does exist, my understanding is that it was only ever released in Europe. There is no mention of it on Motorola's US website, and when I requested a Moto G review unit from Motorola, they sent me the 3G (2nd gen).

    Have you actually seen one for sale in North America? Can you buy one unlocked? I checked online and could only find the 4G (1st gen) for sale.

    - Matt Humrick, Mobile Editor, Tom's Hardware
  • tstng
    1814010 said:
    Quote:
    There are currently 4 versions of the Moto G:
    While a 4G version of the Moto G (2nd gen) with a larger 2390 mAh battery does exist, my understanding is that it was only ever released in Europe. There is no mention of it on Motorola's US website, and when I requested a Moto G review unit from Motorola, they sent me the 3G (2nd gen). Have you actually seen one for sale in North America? Can you buy one unlocked? I checked online and could only find the 4G (1st gen) for sale. - Matt Humrick, Mobile Editor, Tom's Hardware


    Well, that is the oddest thing I have ever seen. Why wouldn't Motorola sell the best version of their merchandise in the US of all places? That's just bad business in my opinion. Well, at least the confusion is cleared up, but the review is misleading to anyone in Europe.
  • MobileEditor
    Quote:
    Well, that is the oddest thing I have ever seen. Why wouldn't Motorola sell the best version of their merchandise in the US of all places? That's just bad business in my opinion. Well, at least the confusion is cleared up, but the review is misleading to anyone in Europe.


    It's definitely confusing, but not as bad as the Galaxy Note 4, for example. It comes in over 20 different SKUs for different regions and carriers, and they have different combinations of SoCs, baseband processors, audio codecs, camera sensors, etc.!

    While we have readers from all over the world, the main Tom's site focuses on North America. We do have regional Tom's sites (UK, Germany, France, Italy, etc.) that cover products sold in those areas, though.

    - Matt Humrick, Mobile Editor, Tom's Hardware