A self-contained automotive battery booster system for boosting depleted automotive batteries when no external power source is available is provided, the self-contained automotive battery booster system having an integral power source; means for connecting the self-contained automotive battery booster system to an automotive battery; circuitry to ensure the safety of the user, the self-contained automotive battery booster system and the depleted automotive battery; and circuitry to allow the user to control the flow of electricity from the integral power source to the depleted automotive battery. The circuitry to ensure the safety of the user, the self-contained automotive battery booster system and the depleted automotive battery can include various warning indicators such as horns and LEDs and can prevent the activation of the self-contained automotive battery booster system in certain situations. The circuitry to allow the user to control the flow of electricity from the integral power source to the depleted automotive battery can allow the user to select different output voltages depending on the voltage required by the depleted battery.