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Nickel-cadmium battery

The nickel-cadmium battery (commonly abbreviated NiCd and pronounced /ˈnɑɪˌkæd/, "nye-cad") is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes.

The abbreviation NiCad is a registered trademark of SAFT Corporation and should not be used to refer generically to nickel-cadmium batteries, although this brand-name is commonly used to describe all nickel-cadmium batteries. On the other hand, the abbreviation NiCd is derived from the chemical symbols of nickel (Ni) and cadmium (Cd), though it is not to be confused with a chemical formula.

There are two types of NiCd batteries: sealed and vented.