As portable electronic devices have become smaller, lighter, and more sophisticated, the batteries that power these devices have had to provide ever increasing levels of energy. Nickel metal hydride batteries provide such a solution with a nickel hydroxide positive electrode and a negative electrode comprised of hydrogen absorbing alloys. Because NiMH batteries have roughly double the energy density of nickel cadmium batteries with the same operating voltage, these batteries have become a mainstay in the world of rechargeable batteries.
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