Sarium krellide batteries were energy storage devices employeed in Starfleet ships in the 24th century. Industrial-grade sarium krellide batteries could provide emergency power for a ship for brief periods of time. (SCE eBooks: Wildfire, Book 1, Wildfire, Book 2)

Sarium krellide was first mentioned in TNG episode: "Night Terrors" (see: clancium oxide).
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