noun
AAA battery; AAA cell
Abbreviation of 単四型乾電池 (たんよんがたかんでんち). Common in everyday speech and writing when referring to AAA-size batteries.
リモコンの電池が切れたから、単四を買ってきて。
The remote control batteries are dead, so please buy some AAA batteries.
このおもちゃには単四が二本必要です。
This toy requires two AAA batteries.
AA battery, larger than 単四.
D battery, much larger than 単四.
C battery, intermediate size between 単一 and 単三.
Abbreviation of 単四型乾電池 (たんよんがたかんでんち), literally 'single-four-type dry cell'. The numeral 四 (four) refers to the size classification in the Japanese battery naming system.