DEWALT DCB609 20V/60V MAX FLEXVOLT 9 Ah Lithium-Ion Battery

Dual-voltage for ultimate flexibility
180 watt hours of energy in each battery pack. Get 360 watt hours when using (2) FLEXVOLT 9.0 Ah batteries in 120V MAX* tools
6X runtime** when used in a 20V MAX* tools
Runs cooler than leading competitor 9.0 Ah battery for better efficiency***
Compatible with all 20V MAX* chargers