The power of corded with the freedom of cordless. 20v/60v Max battery pack changes voltage when you change tools, powering a line of 60v Max tools, 120V Max tools and backwards compatible to existing 20v Max tools and chargers. The batterypack is smart enough to know when to provide runtime for 20V Max tools (6.0Ah) and power in the new 60V Max and 120V Max tools. LED state of charge display. Tri-Platform compatibility 20V Max, 60V Max and 120V Max. Durable construction with a single piece cell holder.