How easy it is to fall into error, if perpetual motion judge only by appearance, showed the so-called battery mechanical energy Ufimtseva. Kursk inventor A., Ufimtsev created a new type of wind power station with cheap inertial battery, arranged by type flywheel. In 1920 Ufimtseva built was the model of his battery in the form of a disk rotating on a vertical axis with ball bearing in the casing, from which deflated the air. Being overclocked up to 20,000 revolutions per minute, the disk remained rotation within fifteen days! Looking at the shaft of this drive for days without rotating the flow of energy from the outside, superficial observer could conclude that it is a real implementation of perpetual motion.