Is the electric motor powered by an onboard battery?
For the Overboat 100F there are three 10kg (22 lb) batteries under the seat that can be recharged by plugging into an ordinary mains power socket. They are removable. For the Overboat 100F  three 10kg (22 lb) removable, socket-rechargeable batteries are placed under the driver’s seat.
For the Overboat 150F, there is one 60kg (132 lb) battery under the seat that can be recharged by plugging into an ordinary mains power socket. This battery is not removable, and must be recharged at a dedicated charging station.