Meaning

noun group of guns or missile launchers operated together at one place

noun a device that produces electricity; may have several primary or secondary cells arranged in parallel or series

noun a collection of related things intended for use together

originBorrowed from Middle French batterie, from Old French baterie (“action of beating”), from batre (“beat”), from Latin battuō (“beat”), from Gaulish. Doublet of batterie. By surface analysis, batter + -y. The electrical sense was coined by American polymath Benjamin Franklin by analogy with a military battery that his series of Leyden jars resembled.

Etymology from Wiktionary, CC BY-SA 3.0