High Capacity Power: This 20-Volt 4.0 Ah lithium-ion battery delivers extended run time for your power tools, allowing you to work longer between charges and complete demanding projects without interruption No Memory Effect: Advanced lithium-ion technology ensures the battery maintains its full capacity charge after charge, with virtually no self-discharge when stored, maximizing productivity and minimizing downtime on the job Lightweight Design: Weighing only 1.4 pounds, this compact battery provides powerful performance without adding excessive weight to your tools, reducing user fatigue during extended work sessions Extended Battery Life: Engineered for durability and longevity, the battery pack maintains consistent performance over hundreds of charge cycles, providing reliable power for your professional and DIY applications Value Pack Quantity: Includes 4 batteries in this package, ensuring you always have backup power ready to go, perfect for high-demand work environments or multiple tool operations throughout the day 20V 4.0 Ah Lithium-ion battery, long run time provides long run time and battery life, no memory and virtually no self-discharge for maximum productivity and less downtime, allows user maximum time of operation and a light battery, weighing 1.4 pounds.