NOVELTY - The motor vehicle battery lead comprises a first flat lead part (2) and second flat lead part (4) positively connected with the first flat part. The first flat part is filled a material to the second part by plasticizing. The two flat parts partially penetrating rotation friction welding point are connected. The transition resistance between the flat parts is less than 0.1 ohm. The flat parts are clamped in the area of the rotation friction welding point in such a manner that the flat parts are concise to each other.    USE - The component deals with the motor vehicle battery lead.    ADVANTAGE - The motor vehicle battery lead has an improved maniability and high flexibility, and is less weight and manufactured in an economical manner.    DETAILED DESCRIPTION - The motor vehicle battery lead comprises a first flat lead part (2) and second flat lead part (4) positively connected with the first flat part. The first flat part is filled a material to the second part by plasticizing. The two flat parts partially penetrating rotation friction welding point are connected. The transition resistance between the flat parts is less than 0.1 ohm. The flat parts are clamped in the area of the rotation friction welding point in such a manner that the flat parts are concise to each other. The first and second flat parts are angularly connected to the longitudinal axis of the first flat part in a level angular to the longitudinal axis of the first flat part. A front surface of the second flat lead is tapered in such a manner that the tapered surface is connected with an angular connection between the first flat lead and second flat lead concisely with a side edge of the first flat lead. The two flat parts are partially connected with one another and arranged in the overlapping region of a second rotation friction welding point. An insulating layer is arranged between the two flat parts and the rotation friction welding point connects the insulating layer through the flat parts in positive-conclusively manner. In the region of the rotation friction welding point, the flat part leads are covered with the insulation layer. The insulating layer is formed as shrink down plastic tubing. An INDEPENDENT CLAIM is included for a method for the production of motor vehicle battery lead.    DESCRIPTION OF DRAWING(S) - The drawing shows a view of a connection of flat part.    First flat part (2)    Second flat part (4)    Connection cable (10)    Motor vehicle battery (12)    Battery clip. (14)