power bank

Definitions

A portable battery-powered device used to charge electronic gadgets such as smartphones and tablets.

A compact, rechargeable external power source designed to provide electricity to mobile devices while away from a wall outlet.

Examples

I always carry a power bank in my bag to ensure my phone stays charged throughout the day.

Since we are going camping for the weekend, don't forget to pack a fully charged power bank.

Synonyms

portable charger external battery pack mobile power source pocket power supply

Antonyms

wall outlet stationary power source depleted battery main power grid