A jump pack can provide additional power to a car to jump-start a completely dead battery. This is because a jump pack has a higher voltage than a car battery and can provide enough power to start the engine. Before using a jump pack, make sure to connect the red and black cables to the correct terminals of the car battery. Disconnect the jump pack once the vehicle is started.
However, if the car battery is completely dead, a jump pack may not be able to jump-start the car. If the car is left completely dead for a long time, the battery may be permanently damaged and will not hold a charge. In this case, you may need to replace the car battery.
In summary, a jump pack is able to provide jump-starting assistance to a completely dead car battery, but its success depends on the condition and health of the battery itself.