English definition
A portable battery pack used to charge phones and other devices.
Yoruba definition
Ẹ̀kì agbára alágbèéká tí a fi ń gba fóònù àti ẹ̀rọ mìíràn.
Example
Bring a power bank to long outdoor events.
Mú kóló agbára lọ sí ìṣẹ̀lẹ̀ òde tó pẹ́.