This charger is a four-port fast charger that charges 12V MAX, 20V MAX, and FLEXVOLT 20V/60V MAX batteries at the same time. This fast charger quickly charges a 4.0Ah 20V MAX battery in 40 minutes, and a 6.0Ah 20V MAX battery in 60 minutes. It is also designed to fit our Tool Connect Tag, and is ToughSystem compatible.