A temperature of a power device to which a power storage device is attached is estimated on the basis of a temperature detected by a temperature detector provided in a power storage device detachably held in the power device.

A vehicle charging planning method includes obtaining charging requests from a plurality of target vehicles, obtaining at least two apparatus transporters with fully charged mobile charging apparatuses, in response to a number of the target vehicles being greater than a number of fully charged mobile charging apparatuses in each apparatus transporter, determining whether driving paths of the at least two apparatus transporters to positions of the target vehicles have an overlapping position, in response to the driving paths having the overlapping position, exchanging the mobile charging apparatuses of the at least two apparatus transporters at the overlapping position and determining a target apparatus transporter, and instructing the target transporter to travel to positions of the target vehicles and providing charging services to the target vehicles using the mobile charging apparatuses on the target apparatus transporter.

A vehicle charging planning method includes obtaining charging requests from a plurality of target vehicles, obtaining at least two apparatus transporters with fully charged mobile charging apparatuses, in response to a number of the target vehicles being greater than a number of fully charged mobile charging apparatuses in each apparatus transporter, determining whether driving paths of the at least two apparatus transporters to positions of the target vehicles have an overlapping position, in response to the driving paths having the overlapping position, exchanging the mobile charging apparatuses of the at least two apparatus transporters at the overlapping position and determining a target apparatus transporter, and instructing the target transporter to travel to positions of the target vehicles and providing charging services to the target vehicles using the mobile charging apparatuses on the target apparatus transporter.

A movable body includes: a rotating body that generates advancing power; a movable body main body that rotatably supports the rotating body; an electric motor that is supplied with electric power to rotate the rotating body; and at least one electric power generating unit including an internal combustion engine, an electric power generator that generates the electric power by an output of the internal combustion engine, and a support structural body that supports the internal combustion engine and the electric power generator and is attachable to and detachable from the movable body main body while keeping supporting both of the internal combustion engine and the electric power generator.

A movable body includes: a rotating body that generates advancing power; a movable body main body that rotatably supports the rotating body; an electric motor that is supplied with electric power to rotate the rotating body; and at least one electric power generating unit including an internal combustion engine, an electric power generator that generates the electric power by an output of the internal combustion engine, and a support structural body that supports the internal combustion engine and the electric power generator and is attachable to and detachable from the movable body main body while keeping supporting both of the internal combustion engine and the electric power generator.