Lenovo ZUK Z1 is backed by a 4,100mAh battery with cut off feature that switches to the power source instead of using the phone's battery once the battery is fully charged. Pic couretsy/Lenovo

New Delhi: Lenovo India on Tuesday launched Lenovo ZUK Z1 smartphone that runs on Cyanogen operating system (OS) 12.1 -- an OS that enables deep customisation of the user interface with its theme app.