What the manufactuters say:
"Fully charged: battery technology powered by BMW i.
BMW i was the technological inspiration behind the C evolution battery. The modules are identical to those used in the BMW i3 and are produced at the same plant in Dingolfing. The battery is charged using the integrated charging device - either at a regular household power socket or at a charging station. When the battery is completely flat, the charging time will ideally be approximately three hours (220 V, 16 A). A charge level of 80 % is reached after just 2:15 h"