Researchers from the National Research Nuclear University MEPhI (Russia) are developing radio isotope beta-voltaic batteries with nickel-63 nano-cluster radio isotope films. The concept is to develop safe nuclear batteries with a service life of 100 years for pacemakers, miniature glucose sensors, arterial blood pressure monitoring systems, and for controlling remote objects and micro-robots, and self-contained systems that can operate for a long time. Research results are published in the journal Applied Physics Letters.