Translation guide
A portable battery used to charge electronic devices like smartphones on the go.
power bank
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.
I forgot my power bank and my phone is about to die.
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.
May be misunderstood as a wall charger. Clarify with context if needed.
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.
このモバイルバッテリーはコンパクトで持ち運びに便利です。
This power bank is compact and easy to carry around.
Do you have a charger? My phone battery is low.