It goes without saying that battery life is one of the huge cornerstones of smartphone evaluation and critique. In the case of Nexus 5, the battery is a 3.8 V, 2300 mAh 2D battery giving 8.74 watt hours total. Looking only at battery capacity doesn’t always tell the whole story, since obviously it’s just a tank to draw from – the overall efficiency of the entire system and the sum of the energy drain of its parts determines how long the platform will last. The comparison point of course for the Nexus 5 is its close cousin, the LG G2, which has a 3000 mAh (11.4 Whr) stacked (3D) battery by LG Chem. Smartphone battery sizes have been increasing for a while now, and the reality is that Nexus 5’s is indeed on the smaller side given its display.

 

As I’ll talk about later, one thing the Nexus 5 has over the LG G2 is a QFE1100 envelope tracker for its cellular power amplifiers, which lowers power consumption by up to 20 percent, the same RF360 part we saw in the Galaxy Note 3. Interestingly enough the LG G2 shipped with a variant of this same family, QFE1101, which works in an APT (Average Power Tracker) mode instead, whereas QFE1100 works in both APT and ET modes. I’ll touch on these in the relevant section, but it’s important to note that in the cellular tests one of the big consumers of power (power amplifiers are easily the number two after display) has the bleeding edge component available to curb consumption and is literally the second handset on the market to include it.

To evaluate battery life we turn to our battery life testing suite, which we run over WiFi and all the cellular interfaces appropriate for the device. Here we see a good combination of regular spikes in CPU usage with idle time, hopefully simulating constant, reasonably paced usage. As always the display is set to exactly 200 nits and configured the same way we always configure devices for maximum consistency.

AT Smartphone Bench 2013: Web Browsing Battery Life (WiFi)

On WiFi, we see the Nexus 5 start off pretty well, behind the G2 and the newest 8974 phones, but no slouch at all, and considerably better than the Nexus 4. Of interest is how the Nexus 5 slips 16 percent versus the G2 despite having a 23 percent smaller battery.

For cellular, it’s the same workload as always. Since the Nexus 5 now has LTE, I went back and re-tested the Nexus 4 with LTE enabled for a closer comparison. Although the Nexus 4 never shipped with LTE officially enabled, the device included it on Band 4 for some time until a baseband update finally locked it out for good. I flashed back down and ran the test just for the sake of completeness, and since I Know there are a fair amount of people out there using the Nexus 4 on LTE still. Of course I also tested on 3G WCDMA.

AT Smartphone Bench 2013: Web Browsing Battery Life (4G LTE) AT Smartphone Bench 2013: Web Browsing Battery Life (3G/2G)

The Nexus 5 comes out far ahead of its predecessor on both 3G WCDMA and 4G LTE, although that’s fairly unsurprising given the year of improvement, different process (28nm HPM), envelope tracking, and battery size differences. The more interesting comparison point is the LG G2, which Nexus 5 can’t quite catch. Clearly the RF front end differences make a difference, otherwise the scaling would be 23 percent less battery on cellular, instead it is 12 percent on LTE. On 3G there’s a bigger delta however, almost 33 percent worse than the G2’s impressive result. Still, the Nexus 5 on LTE is no slouch.

Cellular Talk Time

In the talk time test I was surprised to see a considerable falloff, although this is almost always gated by rock bottom power for the system. There clearly are some other consumers which either aren’t powering down all the way or LG has better optimized for on the G2 versus the Nexus 5 which is Google’s domain.

Device Charge Time - 0 to 100 Percent

Looking at battery capacity alone would leave you with the impression that the Nexus 5 is woefully under-specced, when in reality battery life shows definite gains over previous generation devices. Although I’d love if the device somehow had the same size battery as the G2, it’s clearly enough to make it through at least a full day, and in my time daily driving the device I’ve yet to come up short.

When it comes to charging, Google continues to do the sane thing and implement BC 1.2 signaling. Unlike the LG Optimus G, the Nexus 5 does not use the battery charging IC Qualcomm makes for use in conjunction with its normal PMICs, instead it uses the TI BQ24192 to charge at up to 1.5 A maximum and a MAX17048 fuel gauge. This seems to be done in order to accommodate wireless charging, though there could be other cost considerations at play. The Nexus 5 seems to charge in the linear region at just above 1 A however, although the limit set for BQ24192 is 1.5 A, and has a total charge time just above 2.5 hours on the supplied 1.2 A charger.

As I mentioned, Nexus 5 also works with the Qi (prounounced “chee”) wireless charging specification which Google seems to have thankfully settled on for Nexus 4, 7, and now 5. The Nexus 5 uses TI’s bq51013b power supply and charge receiver which is WPC 1.1 compliant. I praised the Nexus 4 for how well implemented Qi charging was and how it charged in basically the same amount of time on the charging mat or USB, as far as I can tell the Nexus 5 continues to implement things properly and will charge at accelerated rates. I’ve seen a few handsets that include Qi but oddly enough only charge at 500 mA like a USB data port, this is thankfully not the case on Nexus 5.

Nexus Wireless Charger

Google sent along their first party Qi wireless charger as well and I had a chance to check it out. I’ve never used the charging “Orb” that shipped with Nexus 4 so I can’t comment on it, I have however used the two-position Energizer Qi charger and the Samsung Qi charger pad. Google’s universal Nexus wireless charger works with the other Qi compatible Nexus devices, Nexus 7 (2013), 4, and 5, and of course any Qi compliant devices. I tested with the Droid DNA and had no issues charging like any other Qi charger.

Google’s charger works in conjunction with a 9 Watt USB AC adapter and plugs into the charging puck over microUSB. What’s interesting about the charger is both how small it is (the outline is quite small) and how the bottom has a material that seems eerily reminiscent of what was on the bottom of the touchstone charger that shipped with the Palm Pre. The charger will securely adhere itself to surfaces, which it needs to since it has some magnets inside for alignment of devices.


I put some magnetic field viewing film on top of Google’s wireless charger, and you can see four magnets at the corners, which match up nicely with the four metal slugs on the back of the Nexus 5 around the charging coil.

Charge Times

There’s still some overhead and loss with all wireless charging, including Qi. I measured and plotted the power draw and thus charge time for a fully drained Nexus 5 being charged both using the in-box supplied AC charger from Google, and their wireless charger. There ends up being about a 50 minute difference between the two, so you’re definitely trading convenience for a longer charge time, but once you’ve used wireless charging it’s hard to give up that convenience. At the very least, Google’s new charger addresses some of the complaints I saw levied against the original charging Orb with the inclusion of magnets that do seem to hold down devices better and keep them aligned so they charge properly, and included a very good grippy material on the back that adheres it to surfaces quite nicely.

Android 4.4 KitKat and ART Throttling and Performance Analysis
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  • Azurael - Saturday, December 7, 2013 - link

    On the other hand, I don't think you could say Android hasn't matured fantastically over the years. I've been a fan since the start (G1 > Desire > Desire Z > Atrix > SGS2 > One X > Nexus 4) These days, I look forward to using Android more than any other platform I interact with on a daily basis... Even 1.5 on the G1 felt like an upgrade from the busted original iPhone it replaced (maybe not graphically, but certainly functionally - Notifications and Copy/Paste!) And I really wouldn't want to use anything pre-ICS these days.

    And not being a fan of wine, I'd take an Android device any day over the offer of a glass of super priceless vintage wine :)
  • blackmagnum - Thursday, December 5, 2013 - link

    When will Google owned Motorola get a chance to build a Nexus? I'll be looking for a different design language than the Koreans.
  • mrdude - Thursday, December 5, 2013 - link

    Never, I hope.

    The Moto X has some really innovative ideas that are unlike any other phone in the market. I think that phone showed that Motorola is aware that there's a lot more to a great smartphone than just bumping up specs and PPI. The Nexus line, at least to me, seems to be about providing a stable platform to push out Android releases and offer a clean and conservative platform to build upon or strive for. A Moto version of Nexus would likely be just another boring smartphone, which is what I find most Nexus phones to be - great phones, sure, but really boring :P

    Thanks for the review, Brian. Looks like I'm pulling the trigger on the Moto X for roughly the same price
  • usama_ah - Thursday, December 5, 2013 - link

    Completely agree. For a while I wanted a Motorola Nexus but after the Moto X I am happy with Motorola doing their own thing because they've been doing a great job. If anything it would be nice if the two camps (Moto and the Nexus team) learned from each other.
  • Wolfpup - Thursday, December 5, 2013 - link

    I'm fine with the Moto X *IF* it's supported roughly as fast and long as the Nexus line. I figure the Moto X might be, as it might sort of be an unofficial Nexus, given it's supposed to be pretty clean android, and is technically FROM Google.

    I wouldn't touch anything else with a 10 foot pole. Gross 3rd party goop on top of the OS, and if you're lucky you get one OS update, and then it's 8 months late (but hey, that's okay, malware writers are good about waiting for everyone to update before they attack, it's just good sportsmanship).

    The goop Samsung and the rest slop on top of Android reminds me of the bad old Windows 3.1 days, although with Windows 3.1 at least some of the ideas there were interesting, and you could revert to the real interface.
  • Pr3ch34r - Thursday, December 5, 2013 - link

    As long as the nexus line, is that a joke? I just sold a less than 2 years hold Galaxy Nexus that won't even see 4.4, even Samsung devices last more wrt upgrades...
  • Pr3ch34r - Thursday, December 5, 2013 - link

    Hold = old, pls excuse this keyboard
  • Elrando Horse - Friday, December 6, 2013 - link

    Please point me towards the 2011 Samsung phone getting the Kitkat upgrade.
  • redundant - Friday, December 6, 2013 - link

    the beauty of the nexus line is how damn easy it is to install a custom ROM with 4.4. i know that the average user wouldnt be interested in installing a custom rom, but then again nexus buyers usually arent your average folk.
  • Azurael - Saturday, December 7, 2013 - link

    Erm, since the design language is from Google, I'm not quite sure what you're hoping for... Does the Nexus 5 look like the G2? No, it doesn't. Does the Galaxy Nexus look like the SGS2/3? No. The Nexus 4 looks more like the Optimus G than the others I've mentioned with it's sparkly glass back, but it's still more Google than LG given the hardware platform is the same! What have you got against Korean design anyway? It's not like anything Motorla have produced since the original RAZRs could be regarded as stylistically interesting... All smartphones look pretty much the same, it's just something we're going to have to grow to live with. A big slab of glass with a speaker at the top and a mic at the bottom is just that, and you can't really deviate too far without hampering ergonomics.

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