GOOLOO GP4000 Jump Starter

I picked this one because 4000 amps gives a strong margin for larger gas and diesel engines, which is exactly what you want from an emergency jump starter. I also like its built-in safety protections and compact size, so it is easier to keep in the vehicle without taking up much room. Before you buy, check your engine size against its limits and keep the unit charged so it is ready when you need it.