Nickel–metal hydride battery
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Modern NiMH rechargeable cells
|Speceefic energy||60–120 Wh/kg|
|Energy density||140–300 Wh/L|
|Speceefic pouer||250–1,000 W/kg|
|Sel-dischairge rate||13.9–70.6% at room temperature|
36.4–97.8% at 45 °C
Low self-discharge: 1.3–2.9% at 20 °C
|Cycle durability||180 cycles|
|Nominal cell voltage||1.2 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.