This unit is the "Big Boy" of wheeled jump starting units and is specifically designed for the over-the-road transportation industry. It exceeds the challenges of frigid weather and delivers the instant raw power of 1400 Cold Cranking Amps in 12 Volt mode and 800 Cold Cranking Amps in 24 Volt mode. The unit’s charger will maintain it’s internal battery and recharge most lead-acid batteries within 4-8 hours. The internal charging circuit will automatically shut off when the batteries are charged and will maintain them at a fully charged state. The unit has a charging meter which indicates the battery is fully charged. The charger constantly monitors it's storage battery or the battery it's charging. It may be used to charge maintenance-free, conventional, deep cycle, gelled electrolyte, and recombination batteries.