NOCO Boost GB150 3000A UltraSafe Jump Starter

I picked this one because 3000 amps covers larger gas and diesel engines, which is the point of keeping a jump starter in the vehicle. I also like its spark-proof and reverse-polarity protection, since a dead battery is already stressful enough. Before you buy, check your engine size against its limits and keep the unit charged so it is ready when you need it.