vivi z8 folding electric bike, 14inch ebikes for adults, 350w adult electric bicycles commuting folding bike, with 20ah 48v ebike battery, 20mph e bikes 60 mile range vivi vivi z8 is an folding electric bike that will help you get out and ride more. your daily cruises, commutes, and workouts will all get a boost from the strong 350w motor and large capacity removable 20ah lithium-ion battery. plus, this e-bike is equipped with parts that put your comfort and safety first, like a super soft big seat, wide, stable tires, and front and rear shock absorption.