Nickel–metal hydride battery

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Nickel–metal hydride battery
Eneloop 6420.jpg
Modern NiMH rechargeable cells
Speceefic energy60–120 Wh/kg
Energy density140–300 Wh/L
Speceefic pouer250–1,000 W/kg
Chairge/dischairge efficiency66%–92%
Sel-dischairge rate13.9–70.6% at room temperature
36.4–97.8% at 45 °C
Low self-discharge: 1.3–2.9% at 20 °C
(per month)
Cycle durability180 cycles
Nominal cell voltage1.2 V

A nickel–metal hydride battery, abbreviated NiMH or Ni–MH, is a teep o rechairgeable battery. The chemical reaction at the positive electrode is seemilar tae that o the nickel–cadmium cell (NiCd), wi baith uisin nickel oxide hydroxide (NiOOH). Houiver, the negative electrodes uise a hydrogen-absorbing alloy insteid o cadmium. A NiMH battery can hae twa tae three times the capacity o an equivalent size NiCd an its energy density can approach that o a lithium-ion battery.