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Nickel–metal hydride battery

A nickel–metal hydride battery is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel-cadmium cell, with both using nickel oxide hydroxide. However, the negative electrodes use a... Wikipedia
Un number: UN 3496
Charge/discharge efficiency: 66%–92%
Cycle durability: 180–2000 cycles
Energy density: 140–300 W·h/L
Self-discharge rate: Per month:: 13.9–70.6% at room temperature; 36.4–97.8% at 45 °C (113 °F); Low self-discharge: 0.08–2.9%;
Specific energy: 0.22-0.43 MJ/kg (60–120 W·h/kg)
Specific power: 250–1,000 W/kg