The DEWALT DCB118 20v MAX* FLEXVOLT Fast Charger features an internal fan that pulls air across the battery to cool and reduce hot/cold pack delays. This fan assisted cooling results in faster charge times and reduced downtime in the field. The DCB118 Fast Charger can charge a DCB606 FLEXVOLT battery in 60 minutes. It is compatible with all 20V MAX* and 60V MAX* DEWALT batteries.