Technical FAQs 4

What is a nickel metal hydride battery (NiMH)?

(Courtesy of NASA). Nickel metal hydride batteries (NiMH) are a further development of nickel cadmium batteries (NiCd), with the aim to replace the poisonous cadmium. The nominal voltage is only 1.2 V, so that a large number of cells must be connected in series to achieve feasible battery voltages.

Do nickel hydride batteries store more energy than nickel cadmium batteries?

Nickel–metal hydride batteries store more energy than nickel–cadmium batteries. The negative electrode, which is a metal hydride mixture, consists of the potassium hydroxide electrolyte and the positive electrode, the active material of which is nickel hydroxide.

What are nickel metal hydride batteries used for?

Nickel metal hydride batteries commonly are used in portable power applications, especially those such as power tools that require high rate and pulse capability. This chemistry was first discovered by Stanford Ovshinsky in the early 1980s as a replacement for the NiCd.

What happens if a nickel hydride battery is kept on the shelf?

Storing nickel metal hydride batteries on the shelf at ambient temperatures for long periods leads to passivation, which can be manifested as a voltage depression or incomplete subsequent charge due to a high internal resistance in the cell. This results in high cell temperatures.

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