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The active components of a rechargeable NiMH battery in the charged state consist of nickel hydroxide (NiOOH) in the positive electrode and a hydrogen storing metal alloy (MH) in the negative electrode as well as an alkaline electrolyte.
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The advantage compared to rechargeable NiCd batteries is the higher energy density per volume and weight. The substitution of cadmium (heavy-metal) is mostly used to create a positive image but in view of the recycling situation today this does not offer any lasting benefits. In many applications rechargeable NiMH batteries have already replaced the rechargeable NiCd batteries.
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The disadvantages are a higher sensitivity against overcharging, higher internal resistance, shorter service life, greater temperature dependence and a significantly higher cost.
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