Local battery

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 system in which each telephone instrument has its own source of power, as opposed to being powered from the central office.

3. A source of local power for a telephone instrument.

Source: from Federal Standard 1037C and from MIL-STD-188