Battery Life and Thermals

With the performance aspects out of the way, let's turn to battery life. I have to say, I've run more battery tests on the Acer S7 than perhaps on any other laptop in recent history. It's not that it needed extra testing, but as the first Windows 8 laptop in our labs I wanted to look at changing some of the tests. We discussed things among the various editors, and I worked to come up with some redesigned, hopefully better battery life tests.

First on the chopping block is the idle battery life test; rarely do people use workloads that are so light that it's meaningful to look at pure idle battery life, and going to the extreme of muting the volume and turning off WiFi is more than most are willing to do. We've decided to move to our Internet test as the baseline measurement, since it's representative of a moderate workload that conceivably might be used while running a laptop on battery power. With moderate Internet surfing (we load four pages every minute, simulating time for reading) as our light workload, for our heavy workload we crank up the frequency of page loads (the same pages, only loading every 10 seconds now) and add in playback of a bunch of 128kbps MP3 audio files. Finally, for our heavy workload we keep the Internet portion of the moderate testing but add in looped playback of a 1080p H.264 encoded video and have a constant 1Mbps download running from a local server.

With this being the first laptop to use our new Windows 8 test suite, we're in a bit of a state of flux so I've run both the new battery tests along with the old Windows 7 era tests (only with IE10 instead of IE8/9). I also ran a few other battery life tests just for reference: the three PowerMark tests. We're a little hesitant to use PowerMark as a standard, simply because it's limited to Windows platforms and has the potential to encourage optimizations for a benchmark as opposed to general optimizations; as you'll see, however, there's plenty of overlap between our tests and the results from PowerMark.

Battery Life - Idle

Battery Life - Internet

Battery Life - H.264 Playback

Battery Life Normalized - Idle

Battery Life Normalized - Internet

Battery Life Normalized - H.264

Starting with our older 2012 battery benchmarks, the Aspire S7 has a pretty poor showing. The 35Wh battery is the same capacity as the previous generation Aspire S5, and yet battery life is down substantially in all three tests. Whatever Acer (or Microsoft) has done in the past six months has not been helpful in this area. Normalizing for battery capacity does improve the situation a bit, but where it’s enough to move Acer past the two Toshiba Ultrabooks and the HP Envy 14, that’s not saying a lot—and higher battery capacities do count for something. The bottom line is that best-case, we were able to get just over five hours of running time out of the Aspire S7. Let’s look at some other results.

Acer Aspire S7 Additional Battery Tests
Battery Test Run Time
(Minutes)
Normalized
(Min/Wh)
AnandTech 2013 Light 240 6.86
AnandTech 2013 Medium 173 4.94
AnandTech 2013 Heavy 137 3.91
PowerMark Productivity 255 7.29
PowerMark Balanced 201 5.75
PowerMark Multimedia 172 4.91

Note that in the above tests, we’re using 200 nits for our 2013 test suite while PowerMark specifies 110 nits as their desired brightness level. Our Light test result is down 21 minutes from our previous Internet test result, most likely due to the increased LCD brightness. Elsewhere, our new Medium test drops us below the three hour mark, and our Heavy test is getting close to lasting only two hours. It’s not really realistic to expect a full day of use from a laptop when you’re going full-tilt the whole time, but considering the CPU load is only around 10-35% even in our Heavy test, we’re not pushing things that hard.

Windows 8 Tablet Performance Display Quality
POST A COMMENT

54 Comments

View All Comments

  • brtl - Saturday, January 12, 2013 - link

    Does a regular single mSATA SSD drive, such as the Crucial M4 mSATA SSD 256GB, work in the Acer S7 series? Has anybody tried this? Thanks - Bert Reply
  • brtl - Monday, January 28, 2013 - link

    To answer my own question (maybe it will help someone at some point): yes it works fine. After replacing the OEM drive the firmware won't report any Intel RAID controller anymore, so I'm suspecting the RAID controller and firmware for the OEM SSD are actually on the mSATA board. Reply
  • Roy333 - Tuesday, February 12, 2013 - link

    I bought the Acer Aspire S7 from the Microsoft store in Toronto, after using for a week I realized that the internal battery only lasted betewen 3 to 4 hours, I went back to the Microsoft store to buy the external add-on battery pack, I was told they do not carry any Acer products other than the laptops, they told me to buy it on Acers web site.
    That is when I went into Acers spin cycle. The Canadian web site does not carry it, the American web site will not ship to Canada. The emails I sent to Acer asking about the external battery add-on came back telling me that that battery was still under warranty & to send my laptop in to be repaired. I called them up in the USA & was told they can not ship to Canada, but to call their tech number & they could sell me the battery & ship it to Canada. After 45 minutes talking to Daisy in tech support I was told she can not ship to Canada. I then went to Acer Canada's head office, where they gave me a 1-800 number to call, it was some authorized company in Canada & he said he would ask Acer in Texas if they had the battery, I never heard back from him. The moral of the story is I should have bought a Mac Book
    Reply
  • Amit kumar - Wednesday, March 27, 2013 - link

    Wow the device wonderful, truthfully I have belief in your review. It’s have a great features. I got its full specification on this site as well. http://www.gadtecho.com/ Reply

Log in

Don't have an account? Sign up now