This charger is a four-port fast charger that charges 12V max, 20 V max and FLEXVOLT® 20 V/60V max batteries at the same time. This fast charger quickly charges a 4.0Ah 20 V max battery in 40 min and a 6 Ah 20 V max battery in 60 min. It is also designed to fit our Tool Connect™ tag and is ToughSystem™ compatible.