also: せかんどばってり
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.
This camera comes with a second battery.
A backup battery is necessary for long shooting sessions.
Variant without the long vowel marker; less common but seen in technical contexts.
Spelling with an interpunct; sometimes used for clarity.
Rare variant combining the interpunct and the short form.
Loanword from English 'second battery'.