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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.
âA battery is a device that is able to store electrical energy in the form of chemical energy, and convert that energy into electricity,â says Antoine Allanore, a postdoctoral associate at MITâs Department of Materials Science and Engineering ..