Emergency battery

From International Dictionary of Marine Aids to Navigation
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A battery used to maintain the essential services on the failure of principal power supply at a station.

Note: The term can also be used for a battery that provides power to emergency apparatus that has been brought into service.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM