Quha Zono 2 has a rechargeable battery that provides approximately 60 hours of active usage time. The most common reason for Zono 2 turning itself off before 60 hours have passed is partially charged battery. Please check that the Zono 2 battery is charged using a USB port that is powered when the computer is on standby / powered off. Powered USB ports are usually marked with discernible colours or other markings.