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Noun: nickel-cadmium accumulator
  1. A rechargeable battery with a nickel cathode and a cadmium anode; often used in emergency systems because of its low discharge rate when not in use
    "The emergency lighting system used nickel-cadmium accumulator batteries for backup power";
    - nicad

Derived forms: nickel-cadmium accumulators

Type of: accumulator, storage battery