Social battery is a popular online metaphor for the limited energy many people feel they have for conversation and socialising, and saying it has expired has become shorthand for reaching that limit. The phrase spread through memes, short videos and captions about introversion, overstimulation and needing time alone to recharge. Rather than coming from one film or television moment, it grew as everyday internet language, which is why creators keep using it across vlogs, streams and reaction edits whenever a social situation finally becomes too much.