The DEWALT DCB609 FLEXVOLT Battery pack changes voltage when you change tools. It Powers a new line of 60-Volt MAX Brushless tools and 120-Volt MAX Brushless tools. This pack is also backwards compatible with 20-Volt MAX tools and chargers. Features: 180 Watt Hours of energy in each battery pack (360 Watt Hours combined) 9.0 Ah capacity when used in a 20V MAX* tool Compatible with all 20V MAX*, 60V MAX* and 120V MAX* tools 6X the runtime compared to DCB201 1.5Ah Battery Compatible with 20V MAX*, 60V MAX* and 120V MAX* tools LED State of Charge Display