I think this guy is just outright bad at math. No way the size of the lasers battery is anything less than 300kgs.

He also jumps from saying the laser point is 1.5 meters in diameter to saying it's .5 meters in diameter in the next sentence 

 my onions have their own chairs

https://i.poastcdn.org/42bfc390236acc6b66514f7ee315370286adaaff7f4883d573507190f3378cf8.jpg