Ni-Cd rechargeable battery is one type of alkaline storage battery, which is classified as a secondary battery. Ni-Cd batteries use nickel hydroxide as the positive electrode, cadmium as the negative electrode, and an alkaline electrolyte. They are designated by IEC61951 as secondary cells and batteries containing alkaline or other non-acid electrolytes - “Portable sealed rechargeable single cells” - nickel-cadmium. First invented by Jungner of Sweden in 1899, the basis for practical application of rechargeable Ni-Cd batteries was made possible about 50 years later by the development of the totally sealed cell by Neumann of France.

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