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a battery is an electrical storage device. Batteries do not make electricity, they store it, just as a water tank stores water for future use. As chemicals in the battery change, electrical energy is stored or released. In rechargeable batteries this process can be repeated many times. Batteries are not 100% efficient - some energy is lost as heat and chemical reactions when charging and discharging. If you use 1000 watts from a battery, it might take 1050 or 1250 watts or more to fully recharge it.

While the term "battery" is often used, the basic electrochemical element being referred to is the cell. A battery consists of two or more cells electrically connected in series to form a unit. In common usage, the terms "battery" and "cell" are used interchangeably.Batteries are a portable source of electricity. They are used in many ways. Some are disposable, others are rechargeable. They can be used in many different electrical devices, for example: boats, cars, watches, cordless telephones and Mp3 players.

A battery has a positive and a negative electrode. The positive electrode is called a cathode, and the negative electrode is called an anode. In batteries, each electrode contains a different metal. In an alkaline battery, the anode metal is manganese dioxide and the metal in the cathode is zinc.

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