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A rechargeable battery (also known as a storage battery or secondary cell) is technically a group of two or more secondary cells, such as a laptop battery containing six individual cells. However, they are often used to refer to a single cell, such as a NiMH AA battery. These batteries can be restored to full charge by the application of electrical energy, such as through a battery charger. In other words, they are batteries in which the electrochemical reaction that releases energy is readily rechargeable. Rechargeable batteries come in many different sizes using different chemicals. Commonly used secondary cell ("rechargeable battery") chemistries are lead acid, nickel cadmium (NiCd), nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium ion polymer (Li-ion polymer). Rechargeable batteries can offer economic and environmental benefits compared to disposable batteries. Some rechargeable battery types are available in the same sizes as disposable types (eg. AA, AAA, CR123A). While the rechargeable cells have a higher initial cost, rechargeable batteries can be recharged many times. Proper selection of a rechargeable battery system can reduce toxic materials sent to landfills compared to an equivalent series of disposable batteries. For example, battery manufacturers of NiMH rechargeable batteries claim a service life of 100-1000 charge cycles for their batteries.