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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.
A battery is a sandwich. It has two metal ends and some acid/chemical stuff in the middle. The metal ends must be made of different metals. For example, one end might be copper and the other end might be zinc. The acid starts to eat away at the metal ends and they sort of start to rust.