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.
In telephony, a source of local power for a telephone instrument, as opposed to being powered from the central office.
local battery - Computer Definition
A battery that provides electrical power to stations, or terminal devices, as distinguished from the common battery that provides loop current, i.e., electrical energy to the line. See also battery, common battery, electricity, and loop current.