No, you don't always have to charge, but it does greatly help your fellow car sharers. It would be greatly appreciated if you leave the car charging. Aim for an 80% charge; plug the car into the charging station if you are below this.
Important to know: if the battery is below 20% at the end of your trip, you are required to charge and cannot end the reservation. We recommend using the Chargemap app to find available charging stations in your area.