Lithium-Ion 20-Volt Max Power Tools are designed to surpass professionals’ expectations and address the need for tools that have the power to withstand rigorous job site applications, while also providing comfort and ease of use.  FBLI20011 Lithium-Ion Battery made of the highest quality battery cells, no memory effect, can be charged or discharged as needed without loss of capacity. This Lithium-Ion Battery is equipped with overload protection, overheat protection & over-discharge protection. This protection system ensures your safety. Featuring a simple max power and off design for ease of use and an innovative battery charge level indicator with one USB charging port.