NOVELTY - A vehicle (3) is parked in an interchange bay (2). Transfer loaders (6,7) are arranged to transfer batteries from a fresh battery store to the vehicle. The fresh battery store includes triangular battery store racks (4,5) for containing triangular batteries (8) for loading into the vehicle which includes a triangular battery chamber for receiving the triangular batteries.    USE - For exchanging exhausted or partially exhausted battery of vehicle.    ADVANTAGE - Facilitates lateral transfer of batteries between loader and vehicle in single motion, along a single horizontal axis. Electrical connection and disconnection between batteries and between batteries and vehicle are rapidly attained. Enables some multiple functions to be provided in a single assembly. Requirement for providing components for conventional connections, such as nuts, bolts, or wires, between batteries or between batteries and vehicle becomes unnecessary. Requirement to provide heavy battery support frame with associated bearings, alignment mechanisms, locks, other components and their associated weight penalty also becomes unnecessary. Maintenance can be performed on the batteries conveniently off the vehicle. Enables batteries to be rapidly separated from the battery module for maintenance or replacement. Batteries and modules can be rapidly separated and joined together.    DETAILED DESCRIPTION - The transfer loaders are arranged to receive the batteries retrieved from the fresh battery store and manipulate the batteries to adjust position in mutually perpendicular translational movement and tilting directions, or rotate or yaw about a vertical axis, in order to accurately address the battery chamber of the vehicle. INDEPENDENT CLAIMS are also included for the following:    (A) an electrically powered vehicle;    (B) a triangular battery for electric vehicle;    (C) an electric battery arrangement for vehicle; and    (D) a transfer loader for manipulating positional orientation of batteries for loading to vehicle.    DESCRIPTION OF DRAWING(S) - The figure is the schematic explanatory plan view of the vehicle battery interchange system.    Interchange bay (2)    Vehicle (3)    Store racks (4,5)    Transfer loaders (6,7)    Batteries (8)