battery has 7 distinct synonyms spread across 4 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
group of guns or missile launchers operated together at one place
a device that produces electricity; may have several primary or secondary cells arranged in parallel or series
a collection of related things intended for use together
“took a battery of achievement tests”
a unit composed of the pitcher and catcher
a series of stamps operated in one mortar for crushing ores
the heavy fire of artillery to saturate an area rather than hit a specific target
“they laid down a barrage in front of the advancing troops”
an assault in which the assailant makes physical contact
Synonyms, antonyms and the broader and narrower relations for battery come from Princeton University’s WordNet. Full sources and licences.