The DCB606 20V/60V MAX* Battery pack changes voltage when you change tools, powering a line of powerful 60V MAX* tools, 120V MAX* tools, and backwards compatible to existing 20V MAX* tools and chargers. The battery pack is smart enough to know when to provide runtime for 20V MAX* tools (6 A-hr) and power in the new 60V MAX* and 120V MAX* tools. DeWALT® 20V/60V MAX* FlexVolt™ DCB606 with Dcb118 Fast Charger, 6 Ah Li-Ion Battery, 20/60 VDC Charge