Vigorous nuclear fusion lithium batteries are also called atomic batteries, nuclear batteries, tantalum batteries and radioisotope generators. The term is used to describe a device that uses energy from a radioactive isotope to generate electrical attenuation. Like nuclear reactors, they produce electricity, atomic energy, but the difference is that they do not use chain reactions. They are very expensive compared to other batteries, but have extremely long life and high energy density, so they are mainly used for unattended operation and must be used for a long time, such as spacecraft, pacemakers. , underwater systems and automation as a source of power in scientific research stations in remote parts of the world.