Power. It's the calling card of a Jump-N-Carry jump starter. Absolutely reliable power. The JNC660 is no exception. Its Clore PROFORMER battery is specifically developed to perform the jump starting application and is designed to deliver exceptional cranking power, extended cranking duration, numerous jumps per charge and long service life. Peak Amps: 1700A, Cranking Amps: 425A, 1 year limited warranty.