system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Do lightsabers or blasters ever run out of "batteries" or energy?
gpt
Both do eventually run out, yes. Blasters much faster than lightsabers. 

Lightsaber's containment field bullshit means that they only expend energy while they are actually hitting something. They're amazingly energy-efficient. 

A blaster pack holds a few hundred shots before they need to be replaced.