Clore Automotive Jump-N-Carry JNC660 1700 Peak Amp Jump Starter 1,700 Peak Amps; 425 Cranking Amps. Built-in charger. Charger Type- Automatic PROFORMER battery technology is designed to provide extremely high power output, extended cranking power and a long service life 46 inch heavy-duty #2 AWG cables; copper insulated Voltmeter provides charge status of onboard battery DC outlet to power 12 volt accessories; DC input to recharge internal battery When the unit is not in use, we recommend that the battery is charged at least every 30 days.