Heavy-Duty Engine Starting Power - This heavy duty wheeled battery charger delivers up to 275 amps, and can 6 and 12-volt standard, deep-cycle, AGM, and gel batteries Fully Automatic or Timer-Controlled - The microprocessor provides fully automatic or timer-controlled charging, and uses multi-stage charging for added precision, safety, and battery life. Flash Reprogramming - Memory-saver mode saves vehicle settings while charging the battery, and the rolling battery charger can be used to flash reprogram a battery. Durable Safety Features - The DSR122 boasts reverse hook-up and temperature overload protection, and its heavy-duty steel case and clamps allow for daily heavy use.