Stupid scientist, ruining my dreams: The first snag you run into is that battery. "Although real-life battery technology is coming along great," Gluesenkamp writes, "we are a long way off from creating handheld batter...
https://www.neatorama.com/neatogeek/2010/06/11/ge-engineer-explains-why-lightsabers-couldnt-work/
GE Engineer Explains Why Lightsabers Couldn't Work
search took 0.015 seconds