Many Benchmarks Later, the Answer Lies Somewhere Between a Smaller Battery and Heavier Workloads.
Read professional reviews of Apple’s new MacBook Pro lineup, and you’ll come away thinking the new laptops have great battery life.
Dive into a customer forum, though,and the upshot will be exactly the opposite:The new MacBook Pros have “pisspoor” battery life.
That characterization came from user yillbs on MacRumors.com (go.macworld.com/mr). “I don’t think anyone can convince me that this thing isn’t just flat out the worst battery life ever on a MacBook,” yillbs wrote, clearly frustrated. “I’ve been defending it like mad, but at this point… how can you? 4.42 hours is just bad.”
User Happypuppy was anything but. “Not happy with the battery either. I was editing my MacBook review video last night and at 6:28 p.m. it was at 100 percent,” Happypuppy wrote. “At 8:52 p.m. it was down to about 42 percent.”
Contrast those write-ups with Macworld’s review (go.macworld.com/ mwmbp), which said: “Battery life is also solid, with both models lasting a full day of heavy use, with multiple apps open, dozens of Safari tabs, streaming music to Spotify, and occasionally indulging in some video viewing with Sierra’s picture-in-picture feature.”
Macworld isn’t alone. From Laptopmag to The Verge and Notebookcheck.net, the vast majority of reviewers have lauded the MacBook Pros for good battery life.
My own tests agreed. I’m no fan of the MacBook Pro’s butterfly-switch keyboard, nor its lack of USB Type A ports, but one thing I do know is it has relatively good battery life. When I tested both a non– Touch Bar 13-inch MacBook Pro and the base 15-inch MacBook Pro some months ago, I was able to coax about nine hours of 4K video playback from each at 255 nits of brightness.
A SEARCH FOR THE TRUTH
The truth about the MacBook Pro’s battery life had to be somewhere in this mess of conflicting results. I returned to the Mac-Book Pro 15 I’d tested before to put it through multiple run-down scenarios,charging and discharging the MacBookPro 15 under different loads over the course of many days.
This particular MacBook Pro 15 is the baseline model with a Core i7-6700HQ,Radeon Pro 450, 16GB of LPDDR3/2133RAM, and 256GB of flash storage. The OSI used in the majority of these tests was the latest public one available when I started my testing: macOS Sierra 10.12.2. I disabled automatic screen dimming and manually calibrated brightness using our Minolta photometer for each of the brightness settings I used.
You’d typically run these tests multiple times to calculate an average to reduce variability. Given the considerable time it takes to perform individual run-down tests,I went with a more casual single-run scenario.
VIDEO PLAYBACK IS STILL GREAT
For the first test, I ran the open-source 4Kmovie Tears of Steel (go.macworld.com/tos). The actual video player you use can have a huge impact on battery life (you can read more on this topic here: go.macworld.com/vp), so I opted to use Apple’s QuickTime player. Apple’s official video run-down test uses iTunes, but I’ve never figured out how the company is able to get the video to loop for its tests.
The video was looped with the Wi-Fi switched off and audio on. Rather than the laptop’s speakers, I used ear buds to (theoretically) reduce the power drain from driving the larger speakers. The brightness settings I used were at a fairly dim 100 nits, a fairly bright 257 nits (which is a good setting for an office or home in the daytime), and finally, the laptop’s maximum brightness setting of 500 nits.
The MacBook Pro 15 has pretty stellar life playing video. Set to 257 nits, we’re seeing just about eight hours of battery life. Even more impressive to me is that at the blazing 500-nit setting, you can still get six hours of run time. Considering the 2880-by- 1800 native resolution and brightness of the panel, that’s actually pretty nice.
There’s one more result on the chart to be aware of, and that’s the battery life when none of the laptop’s USB-C ports are being used. For all the other tests, I used a self-powered device that logs the voltage of the USB port. This lets us know when the laptop is on, and when it finally dies.
This device works because on older MacBook Pros and most other laptops, the USB Type A ports are run on chips that are usually powered on at all times. The MacBook Pro, however, uses Thunderbolt 3 controllers. With Thunderbolt 3, the chip (go.macworld.com/chp) appears to conserve power by switching off when not being used.
With our USB device in place, however,the Thunderbolt 3 chip appears to stay awake. The laptop itself did not log any power being consumed by the Thunderbolt port, but the results pretty much match the consumption I’ve seen on another couple of laptops, so I think there’s still a small cost in power.
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