noun
rechargeable battery; secondary battery
Technical term used in electronics and engineering; contrasts with 一次電池 (primary battery).
スマートフォンにはリチウムイオン二次電池が使われている。
Lithium-ion rechargeable batteries are used in smartphones.
二次電池は繰り返し充電できる。
Secondary batteries can be recharged repeatedly.
Compound of 二次 (secondary) and 電池 (battery), a calque of the English term 'secondary battery'.