Representing the collective effort of over 30 leading scientists in Russia and the United States, this is the first book written solely on the subject of nuclear batteries. It presents a rich historical discussion and original research on the conversion of nuclear materials into electrical power, which can then be harvested to make long-lasting, more energy efficient batteries. With this technology, power-matched supplies would last decades - even centuries - using safe, direct, long-life, stable, integrated electric power from the highest energy density source available.