Translation guide
A portable battery used to charge electronic devices like smartphones on the go.
モバイルバッテリー
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.
モバイルバッテリーを忘れて、スマホの充電が切れそうだ。
I forgot my power bank and my phone is about to die.
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.
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.
新しいパワーバンクを買ったよ。
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.
充電器持ってる？スマホの充電が少ないんだ。
Do you have a charger? My phone battery is low.