local battery

Noun

 * 1) In telegraphy, the source of power that actuates the telegraphic station recording instruments, as distinguished from the source of power that furnishes current to the line.
 * 2) In telephony, a source of local power for a telephone instrument, as opposed to being powered from the central office.

Translations

 * Finnish: paikallisparisto
 * German: Sprechstellenschaltung