Powerful & Compact: our new 44s lithium jump starter delivers 440 cranking amps (2100 peak amps) in an ultra-compact design weighing less than one pound. Packed with power, 44s is rated for 7 liter gas engines and 3.5 liter diesel engines Advanced Voltage Detection: Weego 44s can detect a voltage as low as 0.5 volts and can provide voltage support (known as pre-conditioning) to raise and maintain the voltage of your vehicle's battery to a level safe for jump starting. If your lead acid battery is completely dead (between 0 0.5 volts), and Weego 44s cannot detect your battery, you can use the bypass button to complete the jump start. Simple & Safe: each 44s car jump starter has patented smarty clamps with built-in protections that will not allow you to jump unless properly connected. Protections include anti-spark, reverse polarity, over-heat and power surge. Long Lasting: the 44s jump starter battery pack can hold a charge for up to one year and c