This is our the first smartphone we’ve seen with a 28nm SoC, and thus battery life is the big question. Further, the handset includes all the onboard MSM8960 radio goodness as we’ll mention in a bit. The problem with some HTC phones for the longest time was that they shipped with smaller than average batteries - while the competition continued up past 6 Whr, HTC would ship phones with 5 or so. That changes with the HTC One X, which includes a 6.66 Whr (1800 mAh, 3.7V) internal battery. I’m presenting the same battery capacity chart that we did in the Xolo X900 review for a frame of reference.

Like we did with the X900 review, we’re going to present the normalized battery performance - battery life divided by battery capacity - to give a better idea for how this compares with the competition.

Battery Capacity

As a reminder, the browsing tests happen at 200 nits and consist of a few dozen pages loaded endlessly over WCDMA or WiFi (depending on the test) until the phone powers off. The WiFi hotspot tethering test consists of a single attached client streaming 128 kbps MP3 audio and loading four tabs of the page loading test through the handset over WCDMA with the display off.

Web Browsing (Cellular 3G - EVDO or WCDMA)

HTC is off to an incredible start with our 3G web browsing tests. Even if you assume that Android and iOS are on even footing from a power efficiency standpoint, the HTC One X is easily able to equal Apple's best in terms of battery life. In reality my guess is that the 4S is at a bit of an unfair advantage in this test due to how aggressive iOS/mobile Safari can be about reducing power consumption, but either way the AT&T One X does amazing here. The advantage isn't just because of the larger battery either, if we look at normalized results we see that the One X is simply a more efficient platform than any other Android smartphone we've tested:

Normalized Battery Life - Web Browsing (Cellular 3G)

The Tegra 3 based international One X doesn't do as well. NVIDIA tells us that this is because of differences in software. We'll be testing a newer build of the One X's software to see how much of an improvement there is in the coming days.

Moving onto WiFi battery life the AT&T One X continues to do quite well, although the Droid 4 and RAZR MAXX are both able to deliver longer battery life in this case:

Web Browsing (WiFi)

There are too many variables at play here (panel efficiency, WiFi stack, browser/software stack) to pinpoint why the One X loses its first place position, but it's still an extremely strong performer. Once again we see a noticeable difference between it and the international One X.

Normalized Battery Life - Web Browsing (WiFi)

The big question is how well does the AT&T One X do when we're using the MSM8960's LTE baseband? Pretty darn well, when you consider that it's bested only by the RAZR MAXX with its gargantuan battery. Probably the most notable comparison point here is the HTC Vivid or Galaxy Note on AT&T which both are based on the APQ8060 + MDM9200 combination. 

As a reminder, the Verizon / CDMA2000 LTE devices here are at a bit of a disadvantage due to virtually all of those handsets camping CDMA2000 1x for voice and SMS. The AT&T LTE enabled devices use circuit switched fallback (CSFB) and essentially only camp one air interface at a time, falling back from LTE to WCDMA to exchange a call.

Web Browsing (Cellular 4G WiMAX or LTE)

This particular graph doesn't tell the full story however. In practice the AT&T One X seems to last a lot longer using LTE than any LTE Android phone we've tested in the past. Nipping at the heels of the RAZR MAXX, we need to look at normalized battery life to get an idea of just how efficient the new 28nm LTE enabled SoC is:

Normalized Battery Life - Web Browsing (Cellular 4G)

Now that we have 28nm baseband we've immediately realized some power gains. As time progresses, the rest of the RF chain will also get better. Already most of the LTE power amplifiers vendors have newer generation parts with higher PAE (Power-Added Efficiency), and such improvements will hopefully continue to improve things and gradually bring LTE battery life closer to that of 3G WCDMA or EVDO.

Using the AT&T One X as a WiFi hotspot is also going deliver a pretty great experience:

WiFi Hotspot Battery Life (3G)

WiFi Hotspot Battery Life (4G)

As an LTE hotspot the RAZR MAXX's larger battery is able to deliver a longer run time, however the One X does very well given its battery capacity and size.

Finally, our cellular talk time charts put the AT&T One X in the upper half of our results. Overall the AT&T One X appears to do very well across the board, but it's very strong in the 3G/LTE tests.

Cellular Talk Time

Normalized Battery Life - Cellular Talk Time

 

Software - ICS with Sense 4 Performance
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  • RussianSensation - Wednesday, May 02, 2012 - link

    You know that HTC One is for pre-order still too?
    http://www.wireless.att.com/cell-phone-service/cel...

    Well if you need a phone right away, then sure get the HTC One. Considering most of us keep our phones for 2 years, I'll wait a month if it means getting a better phone. Can't go wrong with HTC One.
    Reply
  • NeoteriX - Wednesday, May 02, 2012 - link

    "It's premature to recommend a next generation smartphone without testing the S3, at the very least."

    That's a pretty silly statement. There's always a "next best thing" on the horizon. Shall we keep delaying a recommendation waiting for the next generation device? The Galaxy S3 is going to be *announced* in a few days, which says nothing of it's actual release, internationally or in the US.

    In other words, it could be several months before Anand or Brian get their hands on a US S3. Consumers need to make purchasing decisions now. If you want to wait and hope that the S3 may be better, that's your prerogative, but it certainly shouldn't be AnandTech's.
    Reply
  • RussianSensation - Wednesday, May 02, 2012 - link

    That's a pretty silly statement. There's always a "next best thing" on the horizon. Shall we keep delaying a recommendation waiting for the next generation device?

    Umm...it's one thing when that something new is launching in 3-4 months from now. Samsung S3 is launching this week......

    Do you keep a device for 2 years? If so, what's waiting another 1-2 weeks to see how it does? If you don't care sure. HTC One already has poor audio quality which is a big factor for us who listen to music on our phones. That alone is a deal breaker for me.
    Reply
  • metafor - Wednesday, May 02, 2012 - link

    I will wait for the announcement before picking. But if it's anything like the Galaxy S2, a US buyer like myself will have to wait until October to get it :(

    I'm currently trial-testing a One S. I'll be choosing between that, the One X or GS3 when I can get my hands on all 3.
    Reply
  • Skiddywinks - Wednesday, May 02, 2012 - link

    I think you are missing something pretty big here.

    The S3 was meant to be announced months ago, and the reason it was pushed back was because Sammy didn't want to do the typical where they announce a phone, and then can't actually sell any for months.

    I think the S3 will be in consumer's hands a hell of a lot quicker. Hell, there are already pictures of inventory screens with them.
    Reply
  • metafor - Thursday, May 03, 2012 - link

    Consumers in the U.S. The S2 was announced, then available for international customers within IIRC 2 months or so. That's perfectly reasonable and expected.

    It then took godfarking forever for it to come to the U.S. carriers. Verizon never carried it, ever.

    What makes you think Samsung is delaying the announcement for the sole reason of a U.S. market launch?
    Reply
  • dagamer34 - Thursday, May 03, 2012 - link

    Samsung has already stated that they want to announce their phones closer to their actual launch date. It's silly that the Galaxy S II was announced in Feb 2011 and didn't get sold in the US for another 7 months! And with the HTC One X already available, they can't sit on this phone for 2 months. Reply
  • ol1bit - Wednesday, May 02, 2012 - link

    I remember it took almost 9 months for the S2 to make it to America. I doubt the S3 will be any better.

    This HTC rocks, and I'm bet will be way better than the S3.
    Reply
  • Skiddywinks - Wednesday, May 02, 2012 - link

    See my reply to metafor, above.

    Basically, you're (very likely) wrong.
    Reply
  • ImSpartacus - Tuesday, May 01, 2012 - link

    "The One X on AT&T is really a One XL (L for LTE)"

    The humor is strong with this one...
    Reply

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