MDBG: C size battery (PRC); AA battery (Taiwan); see 二號電池|二号电池 (C battery in Taiwan) and 五號電池|五号电池 (AA battery in PRC)
LDC:
CDict: '
Click icons for complete source definitions (not available on mobile). icon in each entry gives source attribution. Want to improve this definition? Check to see if 三号电池 is already in CC-CEDICT. If not, you can add it. (Why?)