The NiMH is an extension of NiCd technology, and offers an improvementin energy density over that in NiCd. The major construction difference isthat the anode is made of a metal hydride. This eliminates the environmentalconcerns of cadmium. Another performance improvement is that it hasnegligible memory effect. The NiMH, however, is less capable of deliveringhigh peak power, has high self-discharge rate, and is susceptible to damagedue to overcharging. Compared to NiCd, NiMH is expensive at present,although the future price is expected to drop significantly. This expectationis based on current development programs targeted for large-scale application of this technology in electric vehicles.
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