Best answer: The 35.8 Wh battery in Lenovo's Yoga Book C930 can realistically last between five and six hours from a single charge depending on brightness and use. The 27W charger uses the USB-C port to charge, and you should be able to get a full charge in under three hours with the laptop powered off.
Lenovo: Yoga Book C930 ($1,050)
Full story from the WindowsCentral blog...