1) Accumulator 2) Battery acronym 3) Battery type 4) Battery variety 5) Certain battery 6) Energy acronym 7) Hybrid kind of battery 8) Kind of battery 9) Li-ion cousin 10) Modern battery type 11) Nickel-cadmium accumulator 12) Power source 13) Rechargeable battery 14) Rechargeable battery type 15) Storage battery 
Nickel Cadmium rechargeable battery
Nickel-Cadmium
Nickel-cadmium rechargable battery. 
[n] - a rechargeable battery with a nickel cathode and a cadmium anode
nickel-cadmium accumulator noun 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