Nickelcadmium batteries

Nickel-cadmium batteries have higher-energy densities and are lighter than lead acid batteries. They also operate better at low temperatures. However they tend to be more expensive. This type of battery was used widely in portable computers and phones but has now been superseded by lithium ion batteries. The largest nickel-cadmium battery ever built is a 40-MW unit in Alaska which was completed in 2003. It occupies a building the size of a football field and comprises 13,760 individual cells.

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