The latest Dewalt lithium battery - The 4.0ah DCB182 replaces the DCB180, offering 33% more runtime with a 0% weight increase. DEWALT XR Li-Ion Battery Technology offers extended runtime and optimised power to complete applications quickly. Lightweight design provides the user with 18V power for the equivalent of 12V NiCd/NiMH pack weight. No memory effect and virtually no self-discharge for maximum productivity less downtime. Compatible with all DEWALT XR Li-Ion 18V Tools. Excellent electrical characteristics.