1、NiCad batteries are also a valid option, but they are not as prevalent as they once were.
鎳鎘電池也是一個有效的選擇，但他們并不像流行，因為他們曾經(jīng)是。

2、NiCad batteries have powered everything from cordless screwdrivers to emergency lights.
鎳鎘電池的適用對象無所不包，從無線起子機到緊急照明燈皆有。

3、However, recharging NiCad batteries is a black art.
然而，給鎳鎘電池充電卻是一個黑色藝術(shù)。