Lenovo Yoga Book Review: A 2-In-1 With A Trick

In all of our battery life tests, Windows 10 Quiet Hours have been enabled and displays are calibrated with lux meters on pure white screens to as close to 115 lux we can get. For the average notebook or tablet this is somewhere between a 45 - 60% brightness setting.

Since notebook and tablet 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 displays vary in brightness at each respective brightness setting in Windows, calibration with the meter is also critical to ensure all displays are set to as near identical brightness as possible before testing.

Battery Life Heavy And Light Loads

Battery Eater Pro is our heavy load test. It taxes the device’s processor, memory, graphics, and other subsystems continuously until the battery dies. The test is designed to approximate the battery’s performance in situations where you are using multiple programs or creating content.

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 incrementally tracks uptime every minute and a final count is recorded before system shutdown. This is a lighter duty test than BatteryEater, but it is still a bit more strenuous than many office productivity tasks.


The Yoga Book's compute performance won't turn heads, but with its low-power hardware, it offers very strong battery life for such a small, thin, device. It topped the charts in the heavy-duty BEP test and just missed the top spot in our custom video playback test. 

Noise: The Yoga Book is silent, as are most tablets, which generally rely on passive cooling instead of noise-producing fans, so there's nothing to report here. The machine doesn't make a peep.