DeWALT DCB606-2 Rechargeable Battery Pack, 20/60 V Battery, 6 Ah

The DCB606 20 V/60 V Max battery pack changes voltage when you change tools, powering a line of powerful 60 V Max tools, 120 V Max tools and backwards compatible to existing 20 V Max tools and chargers. The battery pack is smart enough to know when to provide runtime for 20 V Max tools (6 Ah) and power in the new 60 V Max and 120 V Max tools.