Schumacher PSJ-3612 DSR ProSeries 3600 Peak Amps Jump Starter and Portable Power Unit 3600 peak amps, 470 cranking amps and 385 cold cranking amps Two 18 Ah professional-grade, high output AGM batteries 12 Volt DC power outlet 3 amp built-in, automatic charger Heavy duty clamps have replaceable copper jaws