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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 (remember the special symbol for a battery) is connected to two elements in series. Charge/current flows out of the battery, through element 1, out of element 1, into element 2 and out of element 2 back into the battery. As the charge flows through the battery it acquires energy. Some of that energy is given up to element 1, then some of that energy is given up to element 2.