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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.
An automotive battery is a rechargeable battery that supplies electrical energy to a motor vehicle. It is also known as an SLI battery (abbreviation of starting-lighting-ignition) and its main purpose is to start the engine. Once the engine is running, power for the car is supplied by the alternator.