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Battery. A battery is a hardware component that supplies power to a device, enabling that device to work without a power cord. Batteries are often capable of powering a laptop computer for several hours depending on how much power it requires.ou are here: Dictionary B-Definitions. A battery is a hardware component that supplies power to a device, enabling that device to work without a power cord.
Electrical Energy. Batteries and Cells A cell is a device that produces an electric current by converting chemical energy into electrical energy. A battery also converts chemical energy into electrical energy and is made of several cells. Every cell contains a mixture of chemicals that conducts a current; this mixture is called an electrolyte.