Black & Decker Smart Battery Charger with 15 Amp/10 Amp/2 Amp Continuous Charge Rates is a fully automatic electronic battery charger that features automatic temperature compensation, battery type selection and large digital LED display along with digital diagnostics and fault codes. This 3 stage automatic charging, high frequency power conversion technology supports vehicle alternator check, battery equalization, automatic float mode monitoring and battery reconditioning. It provides spark resistant reverse hook up protection and microprocessor control. Heavy duty cables and clamps are included. This battery charger requires 3-1/2 minute charge to start and 3 hours to fully charge.