Battery Specification: Li-ion; High Capacity Battery for Extended Run Time: 4000 mAh; Voltage: 21V MAX. Offers 2X running time as the Original 2000mAh battery. Lightweight at 1.4 lbs.
Maximum Productivity: No memory and virtually no self-discharge for maximum productivity and less downtime.
Diversity Compatible: Compatible with all 21V MAX* chargers and tools and products.
Secure, Easy Release Latch: Makes swapping the battery between tools eas.
Higher Quality: Extended runtime, battery is made for heavy duty jobsite applications; Improved power, premium grade high energy cells; Resulting in an extended battery life.