Class-leading DEWALT XR 4.0Ah Li-Ion Battery Technology offers extended runtime and optimised power to complete applications quickly.Features and Benefits LED State of Charge Indicator helps manage pack charging Lightweight design provides the user with upgraded 4Ah Power without increasing the size or weight over the 18V 3Ah battery pack No memory effect and virtually no self-discharge for maximum productivity & less downtimeNotes Compatible with all DEWALT XR Li-Ion 18V Tools