A fierce man who made his own nuclear battery that does not need to be replaced for more than 10 years and incorporated it into a portable game machine appeared - GIGAZINE
NanoTritium battery is good for twenty years (or more)
A 25-Year Battery | MIT Technology Review
CNL studies tritium battery technology - Canadian Nuclear Laboratories
Tetris Handheld Powered By Tritium Cell, Eventually | Hackaday