Our heavy-duty truck jump starter, model CAT797, is a high-end design with a real battery capacity of 3.7V/64000mAh. People often wonder why this model is so expensive. The reason is that we use LiCoO2 battery material, which is rarely used by other manufacturers. This battery material is of superior quality and provides strong performance. It is specially designed for starting super large vehicles and is suitable for all types of vehicles, including airplanes. It keeps working even under temperature minus 20 degrees! So it's your best choice in winter for your super large vehicles!