NOVELTY - The vehicle comprises a battery (11) having one electrical connection, and a holding device (2) having other electrical terminal for electrical contacting of the first electrical connection of the battery. The holding device is arranged on the vehicle, and a groove-nut connection, comprising a groove (30) and a slot nut is provided between the battery and the holding device such that a turning of the battery on the holding device is possible. The slot nut is equipped with a cylindrical head.    USE - Electrical and/or muscle power operable vehicle e.g. electric bicycle.    ADVANTAGE - The improved battery assembly for easier handling of the battery during operation is provided. The improved possibility of adding the battery to the electric vehicle, and a simple charging of the battery are allowed. The turning of the battery on the holding device is possible without detaching the battery from the holding device. The compact construction is realized. The high degree of variability for different vehicles with various frame geometries is provided. The simple construction is obtained if provided in the battery slot of the slot-nut connection and the nut is provided on the holding device. The very compact construction is possible on both sides of the groove. The groove on the battery is arranged in the center on a side surface of the battery. The complete removal of the battery from the holding device is realized in a simple manner. The very compact and space-saving installation of the battery is enabled. The change in geometry of the bicycle frame is not made. The smooth rotation of the battery on the holding device is achieved. Therefore, a simple and cost-effective construction of the battery is achieved. The electrical connection of the battery is easily accessed. Therefore, a very convenient charging is performed without removing the battery from the vehicle.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for loading of a battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the battery.    Holding device (2)    Battery (11)    Seat tube (16)    Lock (17)    Groove (30)