A rechargeable battery, also know as a storage battery, is a group of two or more secondary cells. These batteries can be restored to full charge by the application of electrical energy. This means, they are electrochemical cells in which the electrochemical reaction that release energy is readily reversible. Rechargeable electrochemical cells are therefore a type of accumulator. They come in many different designs using different chemicals. Commonly used secondary cell chemistries are lead and sulfuric 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 when used instead of one-time-use disposable batteries. Most rechargeable battery technology has been adapted into the standard "AA", "AAA","C","sub-C","D", and "9-volt" configurations that consumers are familiar with. Although the rechargeable versions of these types of cells have a higher up-front cost than disposable batteries, rechargeable batteries can be discharged and recharged many times. Some manufacturers of NiMH type rechargeable batteries claim a lifespan up to 3000 charge cycles for their batteries.

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