Translation guide
A portable battery used to charge electronic devices like smartphones on the go.
Referring to the device itself, commonly used in everyday conversation.
The most common and natural term for a power bank in Japanese. Widely understood and used in both casual and formal contexts.
Literally 'charger', but can refer to a power bank in context. However, it more commonly means a wall charger or charging cable. Use with caution to avoid confusion.
Direct loanword from English. Recognizable but less common than モバイルバッテリー. May sound slightly technical or marketing-oriented.
I bought a new power bank.
Do not translate 'power bank' directly as パワーバンク unless you are sure the listener is familiar with the English term. モバイルバッテリー is the standard term.
I forgot my power bank and my phone is about to die.
This power bank is compact and easy to carry around.
Do you have a charger? My phone battery is low.