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Nickel Metal Hydride Batteries (NiMH)Nickel Metal Hydride batteries can have capacities as much as 90% higher than equivalent size Nickel Cadmium cells. Moreover, they have less "memory effect", are environmentally friendly, and lighter in weight. The trade-off is that they have a slightly lower cycle life and require a more sophisticated charge control. The cost (for equivalent cell sizes) is more than NiCD, but the cost per WH is the same or less. NiMH batteries are well suited for use in portable and remote data acquisition devices and many kinds of portable medical equipment. They are increasingly replacing NiCD batteries in power tools, as their performance at higher discharge rates continues to improve. Links to battery suppliers' technical specifications:
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