Motor start capacitors , also known as electrolytic motor start capacitors, provide a quick and reliable way to start an electric motor. They are an effective power-current delivery system that, when combined with a motor, helps to provide the power required to start a motorized device. Motor capacitors are unique in that they are able to deliver a large amount of current in a short amount of time, which is something that is not possible with a conventional battery. When a motor is switched on, it takes a moment for the motor to reach its operating speed.