Yoga 700 Battery Life, How We Test And Acoustics
In the following benchmarks we employ two very different battery life tests: Battery Eater Pro and a custom 1080p HD video loop test, to prove out battery life with our test group of machines and the Lenovo Yoga 700. In all tests, Windows 10 Quiet Hours have been enabled and displays are calibrated with lux meters on pure white screens to 115 lux. For the average notebook this is somewhere between a 45 - 60% brightness setting. Since notebook displays significantly affect power consumption and battery life, it's important to ensure a level playing field with respect to brightness of the display for battery testing. However, since many notebook displays vary in brightness at each respective brightness setting in Windows, this calibration with the meter is also critical to ensure all displays are set to as near identical brightness as possible before testing.
When stressing the Yoga 700, the battery only lasted just over two hours before throwing in the towel. That's not great, though this particular benchmark is especially rough on laptops. You'll notice that the top performer, a Dell XPS 13 with Broadwell inside, only lasted 22 minutes longer.
Our custom HotHardware video loop test takes a 1080p HD video with a 16Kbps bit rate and loops it repeatedly, with 1 minute break intervals in between. A timer log file increments minutes of uptime every minute and a final minutes total recorded before system shutdown is stored in the log. This is a lighter duty test that is still a bit more strenuous than say many office productivity tasks but it's not nearly the strain that Battery Eater puts on a system.
We were more disappointed by the Lenovo machine's performance in our video loop test than with Battery Eater Pro. It lasted just 3 hours and 39 minutes; the Yoga 700 left quite a bit to be desired for an ultraportable that can function as a tablet. It's also far below Lenovo's claim of being able to play video for up to 7 hours.
As far as noise goes, the Yoga 700 is a fairly quiet system. Even under load, the fans never get obnoxiously loud.