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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.
The battery is a DC (direct current) device as it produces  unidirectional current flow.    A charger is a device that produces a DC voltage. We usually think  of this device as being plugged into an AC source (like a wall  outlet). The voltage it produces is slightly higher than that of  the battery it is designed to charge. All we need to do is hook the  charger up to the battery and the battery charges.