An accumulator was an object which collected and stored any form of energy.
The insectoid ship encountered by the USS Enterprise in 2269 had wands which collected energy from motion, sound, light, heat, and every kind of energy around them. (TAS: "Beyond the Farthest Star")
While on the surface of Delphi Ardu IV in 2364, Geordi La Forge noticed that the whole planet served as a power accumulator. (TNG: "The Last Outpost")
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