NOVELTY - A battery pack that is loaded in an electric vehicle (59) in a removable manner and supplies power to the electric vehicle (50) comprises batteries (11) that can be charged; a case (2) that houses the batteries (11); and a connector (3) that connects to the electric vehicle (50) connecting terminals (52) to supply power from the batteries (11) housed in the case (2).    USE - The battery pack is used in an electric vehicle and supplies power to the electric vehicle (claimed).    ADVANTAGE - The battery pack loads in a removable manner primarily in electric vehicles such as electric motor-bikes (e.g. electric motor scooters and motorcycles) and bicycles with electrical assist to supply power to a motor that drives the electric vehicle.    DETAILED DESCRIPTION - A battery pack that is loaded in an electric vehicle (59) in a removable manner and supplies power to the electric vehicle (50) comprises batteries (11) that can be charged; a case (2) that houses the batteries (11); and a connector (3) that connects to the electric vehicle (50) connecting terminals (52) to supply power from the batteries (11) housed in the case (2). The battery pack is inserted downward into, and disposed in a fixed position in a loading cavity (51) in the electric vehicle (50) to connect the connector (3) to the connecting terminals (52) mounted in the electric vehicle (50) and supply power to the electric vehicle (50). The connector (3) is attached to the case (2) in an orientation that establishes an insertion section (33) on the underside of the case (2), and this enables the connector (3) to connect to the connecting terminals (52) mounted in the electric vehicle (50) via the weight of the battery pack. The case (2) is provided with a case extension (21) that protrudes from the surface of the case (2) and holds the connector (3) inside, where the bottom surface of the case extension (21) is disposed above the bottom surface of the case (2), and the bottom surface of the case extension (21) has a connector window (22) opened to expose the connector (3) insertion section (33) outside the case (2), and where the case extension (21) is inserted in the electric vehicle (50) loading cavity (51) to connect the connector (3) to the connecting terminals (52) mounted in the electric vehicle (50). An INDEPENDENT CLAIM is an electric vehicle equipped with a battery pack comprising: a loading cavity (51) to hold a battery pack inserted downward into a fixed position; and connecting terminals (52) mounted in the loading cavity (51), where the connector (3) of the battery pack loaded in the loading cavity (51) connects to the connecting terminals (52), and power is supplied from the battery pack, where the battery pack has a connector (3) attached to a case (2), which houses batteries (11) that can be charged, connecting to the loading cavity (51) connecting terminals (52) to supply power from the batteries (11) housed in the case (2), where the connector (3) is attached to the case (2) in an orientation that establishes an insertion section (33) on the underside of the case (2), and this enables the connector (3) to connect to the connecting terminals (52) mounted in the loading cavity (51) via the weight of the battery pack, where the case (2) is provided with a case extension (21) that protrudes from the surface of the case (2) and holds the connector (3) inside, the bottom surface of the case extension (21) is disposed above the bottom surface of the case (2), and the bottom surface of the case extension (21) has a connector window (22) opened to expose the connector (3) insertion section (33) outside the case (2), where the loading cavity (51) has a ledge surface (54) opposite the bottom surface of the battery pack case extension (21), the ledge surface (54) is disposed above the bottom surface of the loading cavity (51), and the connecting terminals (52) are disposed on the ledge surface (54), and where the battery pack is inserted into the loading cavity (51), and the connector (3) exposed from the bottom surface of the case extension (21) is connected with the connecting terminals (52) disposed on the ledge surface (54).    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded oblique view of the battery pack.    Battery block (1)    Case (2)    Connector (3)    Case extension (21)    Connector window (22)