DEWALT 20/60 V FlexVolt Lithium-Ion Battery 9.0 Ah

Dual-voltage 20V/60V MAX, 9.0 Ah FLEXVOLT® battery automatically changes voltage when you change tools, providing up to 6 times the runtime of 20V MAX tools and the power of a tool with wire for 60V MAX and 120V MAX tools. Tackle the biggest jobs with this battery, as its patented technology and large cells allow it to generate less heat during operation compared to the leading competitor's 9Ah battery, all at constant discharge. This is the correct battery for FLEXVOLT® tools with extended runtime.