At the push of a button, a 7-stage charging cycle is initiated for lithium batteries and a 9-stage cycle for lead-acid/AGM batteries. The device features a digital display to simplify the charging process and a variety of safety functions, including reverse polarity protection and overvoltage protection. Just connect it and rest assured that the charger will take care of your car battery: it automatically switches to long-term maintenance mode once the battery is fully charged.