Loading and/or unloading device and method for hybrid or electric vehicles

The device (10) has an outlet (12) that is connectable to an on-board recharging unit of a vehicle. An information exchanging unit exchanges (22) information with the vehicle. A control unit (43) controls charging of the vehicle. The control unit is associated with a data interface (13) and the information exchanging unit. A data storing and transmitting unit stores and transmits data for billing of energy consumed by a user through a platform, which is accessible by Internet. The control unit comprises a planning unit for planning charging and/or discharging operations. Independent claims are also included for the following: (1) a system for charging and/or discharging a battery of a hybrid or electric vehicle (2) a method for charging and/or discharging a battery of a hybrid or electric vehicle.