noun
AA battery; AA cell
Abbreviation of 単三型乾電池. Used in everyday contexts when referring to AA-size batteries.
リモコンの単３が切れた。
The AA battery in the remote control died.
単３を４本買ってきて。
Buy four AA batteries, please.
Abbreviation of 単三型乾電池 (tan-san-gata kandenchi), literally 'single-three type dry cell', where 単三 indicates the third size in the Japanese battery classification system.