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Nickel–cadmium battery
The nickel–cadmium battery is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes. Wikipedia
Inventor: Waldemar Jungner
Charge/discharge efficiency: 70–90%
Cycle durability: 2,000 cycles
Energy density: 50–150 W·h/L
Nominal cell voltage: 1.2 V
Self-discharge rate: 10%/month
Specific energy: 40–60 W·h/kg