I don't always Ride an electric bike. But when I do, I prefer VIVI electric bike. VIVI-Z8 is a folding electric bike that will help you get out and ride more. Your daily commutes, travel and workouts will all get a boost from the strong 350w motor and large capacity removable 48V 20Ah lithium-ion battery. You can adventure longer, commute quicker, and climb hills more easily. The extra boost makes riding your bike even more exciting and enjoyable, and quality components and comfort features make going farther and faster more fun than ever.