Nickel metal hydride – an advance on nickel cadmium (NiCad) batteries, with longer life. Various metals form the “metal” but it is commonly lanthanum, a rare-earth element that today is produced almost entirely in China, which is the source for almost all US imports of lanthanum and other rare earths. Such batteries are used in electric and hybrid cars.
NiMH stands for nickel-metal hydride. This type of battery is unique because it is rechargeable. NiMH batteries can hold 30-50% more charge per pound than a NiCD battery, and they suffer less from the “memory effect.” In order to obtain maximum efficiency, NiMH batteries still require complete discharges.
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