Rechargeable batteries also known as storage batteries are a group of one or more secondary cells specially designed for use over and over again unlike single use batteries. Once used, they can be charged again for reuse. Today more and more gadgets and devices are being designed to use rechargeable batteries only.

Mainly nickel (Ni) and cadmium (Cd) are used to make these rechargeable batteries. Other commonly used chemistries are lead acid, nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium ion polymer (Li-ion polymer). In order to be reused, rechargeable batteries have electrochemical reactions that are reversed.

Currently all devices like cellular and cordless telephones, video cameras, portable power tools, small appliances, and laptop computers use rechargeable batteries. They are also used for applications such as automobile starters, light vehicles (such as motorized wheelchairs, golf carts, electric bicycles, and electric forklifts), tools, and uninterruptible power supplies.

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.

Since the environmental release of cadmium can be of concern when the batteries are discarded. Proper selection of rechargeable batteries can reduce toxic materials. Today, the best rechargeable batteries are the new hybrid Nickel-Metal Hydride (Ni-MH) cells. These rechargeable batteries not only hold their charge for many months but are also environmentally safe

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