also: せかんどばってり
noun
second battery; backup battery
Refers to an additional or spare battery, often used in devices like cameras, laptops, or electric vehicles to extend runtime or provide backup power.
このカメラにはセカンドバッテリーが付属しています。
This camera comes with a second battery.
長時間の撮影にはセカンドバッテリーが必要だ。
A backup battery is necessary for long shooting sessions.
Rare variant combining the interpunct and the short form.
Loanword from English 'second battery'.