They enjoy a longer life than NiCd batteries.
Nickel Cadmium (NiCd) Batteries - While these batteries are older technology, they are also the battery most people are familiar with.
Nickel Metal Hydrid (NiMH) Batteries - Manufacturers of these batteries state that they are better for the environment than the NiCd batteries because they don't contain cadmium.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.