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 60 V MAX and 120 V MAX tools. The power of corded, the freedom of cordless. LED state of charge display. 4x run-time compared to DCB201 1.5 Ah battery pack. Tri-platform compatibility 20 V Max, 60 V Max and 120 V Max. Durable construction with a single piece cell holder.