Nickelcadmium batteries have high reliability, good cycle life, but high cost. They are mainly used in electric tools, etc. Because cadmium is highly toxic, causing serious harm to the environment and the body of production workers, this series of batteries has been basically banned.
Nickel-metal hydride battery is an environmentally friendly product developed on the basis of nickel-cadmium battery, with the same basic characteristics as cadmium-nickel battery. It is used in power tools and in recent years in hybrid electric vehicles. The disadvantage is high cost, low temperature performance is poor, such as winter outdoor use capacity is greatly reduced, limiting the scope of application.
