A portable power source for starting a variety of outdoor power equipment. The portable power source generally includes a housing, an electrochemical power supply, a switch having an ON position with a fixed contact and a START position with a momentary contact, and a connector connected to the switch. The switch may be electrically connected to the electrochemical power supply and, using a cable, the connector is operable to be electrically connected to a starter motor associated with the outdoor power equipment. Actuation of the switch to the START position electrically connects the electrochemical power supply to the starter motor. The portable power source is adapted to be used as a primary power source and an auxiliary power source. The portable power source also includes an integrated light, an air compressor, a power supply indicator, and one or more inputs and outputs to receive and provide direct current ("DC") and alternating current ("AC").