13-Inch 2013 MacBook Air Gets Up to 15 Hours of Battery Life With Mavericks

In his lengthy and ultra-detailed review of Mavericks, John Siracusa of Ars Technica conducts battery benchmark tests to measure Mavericks' power saving features on both a 2007 MacBook Pro and a 2013 13.3-inch MacBook Air.

While both systems saw notable battery gains going from Mountain Lion to Mavericks, the 2013 MacBook Air in particular saw impressive improvements of up to 30 percent, lasting for more than 15 hours in some instances.

batterylifetestsmavericks
For his battery tests, which were conducted using OS X 10.8.5 and the GM build of Mavericks, Siracusa created a light Web browsing and text-editing automation script, including websites that used Flash. In his tests, battery life varied significantly, but provided, on average, an increase of two hours of work time.

I suspect the aggressiveness of the auto-playing Flash ads that happen to be on specific websites on a particular day may partly explain the huge variability in Mountain Lion's numbers. Some of the lower-scoring Mountain Lion trials may have also had the bad luck to coincide with energy-intensive periodic jobs—jobs that are prevented from running on Mavericks due to AC power or battery-level restrictions as part of centralized task scheduling.

These tests may or may not be representative of how you use your Mac, but regardless, it's clear that Apple's efforts have not been in vain. Mavericks really does consume less energy than Mountain Lion when performing the same tasks.

Since its debut at WWDC, Apple has touted the power saving features bundled into Mavericks, poising improved battery life as the keystone of the operating system. Mavericks is designed to cut down on CPU activity using Timer Coalescing, Compressed Memory, and App Nap.

While Timer Coalescing bundles low-level operations into a single batch action that reduces CPU utilization by up to 72 percent, App Nap cuts down on the power usage of apps that are not running in the foreground, reducing their overall power draw by up to 23 percent. Compressed Memory also works in conjunction with these two features, compacting the least used processes so less time is spent reading and writing virtual memory swap files on disk, which improves power consumption.

There's also a new power saving feature built directly into Safari, called Power Saver. With Power Saver, Safari intelligently detects plug-in content playing in the margins of a website and pauses it, preserving battery life.

During Apple's October 22 event, Apple's senior vice president of Software Engineering Craig Federighi also highlighted Mavericks' battery saving capabilities on the new 13-inch MacBook Air, noting that the operating system provides an extra hour of web browsing and an hour and a half of extra video time.

Mavericks is available for free from the Mac App Store and is a one-step update for all Mac users running OS X Snow Leopard and above. It can be installed on most computers produced after 2007. As of this morning, total Mavericks adoption hovered at approximately seven percent.

Related Roundup: MacBook Air
Buyer's Guide: MacBook Air (Neutral)

Top Rated Comments

(View all)
Avatar
91 months ago
This is where Apple kills the competition.
Score: 46 Votes (Like | Disagree)
Avatar
91 months ago
My 2007 Macbook Pro battery lasted about 10 minutes on Mountain Lion. Just upgraded to Mavericks, hoping to get a whole half an hour!
Score: 44 Votes (Like | Disagree)
Avatar
91 months ago
Wow!
Score: 37 Votes (Like | Disagree)
Avatar
91 months ago
Can't innovate anymore my ass!
Score: 32 Votes (Like | Disagree)
Avatar
91 months ago
Very nice! 15 hours for a MBA is insanity. Wow.
Score: 13 Votes (Like | Disagree)
Avatar
91 months ago

You'll be lucky! in my Real World test (that is actually using the damn thing not just setting up some script) I've never had more than 8 hours from my June 2013 13" Macbook Air. In consequence I expect I'll be extremely lucky if I get more than 9 hours with Mavericks (and yes I've already upgraded and in two hours of use (web surfing mainly but one or two other very minor tasks like setting up iBooks) the battery life is down to 72%.

So it looks like far from battery life improving, it's got worse. At least this time yesterday i was only down to 75%


sounds like a pretty scientific test you got there.
Score: 11 Votes (Like | Disagree)

Top Stories

New Photos Offer Better Look at iPhone 12 Color Options

Tuesday October 20, 2020 2:34 am PDT by
As we wait for the iPhone 12 review embargo to lift later today, more pictures are circulating of the devices in real-world lighting conditions, providing a better look at the different colors available. Leaker DuanRui has shared images on Twitter of the iPhone 12 in white, black, blue, green, and (PRODUCT)RED. The black and white colors are similar to the iPhone 11 colors, but the other...

iPhone 12 Pro in Graphite and iPhone 12 in Blue Shown Off in Unboxing Videos

Monday October 19, 2020 8:20 am PDT by
While the iPhone 12 Pro does not launch until Friday, we now have an early unboxing video of the device courtesy of Twitter account DuanRui, providing a closer look at the shiny new flat-edge design and sleek Graphite color option. Ben Geskin re-uploaded the unboxing video to YouTube, which we've embedded below: Geskin has also uploaded an unboxing video of the iPhone 12 in Blue: ...

Apple Releases iPadOS and iOS 14.1 With Multiple Bug Fixes Ahead of iPhone 12 Launch

Tuesday October 20, 2020 10:06 am PDT by
Apple today released iOS and iPadOS 14.1, the first major updates to the iOS and iPadOS 14 operating system updates that were released in September. iOS and iPadOS 14.1 come a week after Apple released the golden master versions of the updates to developers. The iOS 14.1 update can be downloaded for free and it is available on all eligible devices over-the-air in the Settings app. To access...

Watch: iPhone 12 and iPhone 12 Pro Unboxing Videos and First Impressions

Tuesday October 20, 2020 6:05 am PDT by
Apple's embargo has lifted for iPhone 12 and iPhone 12 Pro reviews. In addition to our detailed review roundups for each device, we've rounded up over a dozen unboxing videos and first impressions below. iPhone 12 in Blue on left and iPhone 12 Pro in Pacific Blue on right via Engadget Key new features of the iPhone 12 and iPhone 12 Pro include a flat-edge design, 5G support, a much faster A14 ...

Gold Version of iPhone 12 Pro Apparently Has a More Fingerprint Resistant Stainless Steel Frame

Tuesday October 20, 2020 11:56 am PDT by
iPhone 12 Pro reviews hit the web today, and one of the more interesting tidbits came from TechCrunch's Matthew Panzarino, who revealed that the Gold version of the device apparently has a more fingerprint resistant coating applied to the stainless steel frame. From his review:Most of the iPhone 12 Pro finishes still use a physical vapor deposition process for edge coating. But the new gold...

Photographer Austin Mann Tests the iPhone 12 Pro's Camera

Wednesday October 21, 2020 4:14 am PDT by
Travel photographer Austin Mann usually performs an in-depth review of new iPhone models to test their camera performance in real-world scenarios. To test Apple's new iPhone 12 Pro, Mann traveled to Glacier National Park, Montana. Mann focused on some of the biggest camera upgrades with the iPhone 12 Pro, including the upgraded Wide lens, Ultra Wide Night mode, and LiDAR autofocus, across a...

iPhone 12 Pro Max Has Smaller 3,687 mAh Battery According to Regulatory Filing

Tuesday October 20, 2020 8:48 pm PDT by
Apple's new iPhone 12 Pro Max is equipped with a 3,687 mAh battery, which is around 7% less capacity than the 3,969 mAh battery in the iPhone 11 Pro Max, according to a regulatory filing published by TENAA, the Chinese equivalent of the FCC. The regulatory filing, spotted by MacRumors, also lists the iPhone 12 Pro Max with 6GB of RAM as seen in benchmark results last week. Apple has filed ...

5G Drains iPhone 12 Battery 20% Faster Than 4G in Benchmark

Wednesday October 21, 2020 3:17 am PDT by
After the first reviews for the iPhone 12 and iPhone 12 Pro emerged yesterday, a new report by Tom's Guide reveals the extent of battery life reductions when using 5G. The report outlines a test wherein the iPhone surfs the web continuously at 150 nits of screen brightness, launching a new site every 30 seconds until the battery drains. Interestingly, the test was run on an iPhone 12 and...

Hands-On With Apple's iPhone 12 and 12 Pro MagSafe Cases

Tuesday October 20, 2020 1:33 pm PDT by
Apple's iPhone 12 and 12 Pro are launching this Friday, and ahead of that release date, Apple is shipping out various accessories like the MagSafe charger and MagSafe cases. Yesterday we took a look at the MagSafe charger, and today our MagSafe case came in the mail, so we thought we'd take another look at the charger to see how it works with the case and just how strong the case magnets are. S ...

Reliable Leaker Suggests AirTags 'Coming Soon' in Two Different Sizes

Tuesday October 20, 2020 1:53 am PDT by
Apple's rumored AirTags Bluetooth tracking devices could launch imminently and will be available in two size options, based on new tweets from cryptic-but-reliable leaker L0vetodream. In typical enigmatic style, the leaker first tweeted this morning that a "big one" and a "small one" are "coming soon," but withheld what they were referring to. However that was followed an hour later with the ...