An arrangement for a motor vehicle having an electric or hybrid engine includes a power supply battery and reinforcing elements to protect the battery from external stresses applied to the vehicle in a longitudinal and/or transverse direction of the vehicle, in particular in the event of an impact. The reinforcing elements are separate from the battery and separate from an enclosure of the battery in particular. The battery is attached to the reinforcing elements. First structural elements of the chassis of the vehicle are sandwiched and clamped between the battery and the reinforcing elements.