Mobile emergency charging device for a battery of a motor vehicle, emergency charging method, and motor vehicle with a lifting mechanism

A mobile emergency charging device for a battery of a motor vehicle that is designed to charge the battery in a recuperation operation, comprising:

• at least one fuel tank, an internal combustion engine, and at least one drive roller for driving a wheel of the motor vehicle;
• the at least one drive roller is connected at least indirectly to an output shaft of the internal combustion engine and is set into a rotational movement by way of this connection when the internal combustion engine is running;
• the drive roller can be positioned beneath one of the wheels of the motor vehicle in such a way that, by the rotating drive roller, when the internal combustion engine of the mobile emergency charging device is running, the wheel in question is set into a rotational movement, and the battery is thereby charged in the recuperation operation of the motor vehicle.