This charger is a 4-port fast charger that charges 12-Volt MAX, 20-Volt MAX and FLEXVOLT 20-Volt/60-Volt MAX batteries at the same time. This fast charger quickly charges a 4.0 Ah 20-Volt MAX battery in 40-minutes and a 6.0 Ah 20-Volt MAX battery in 60-minutes. It is also designed to fit our Tool Connect Tag and is Tough System compatible.