Dewalt's 20V Max Premium XR Lithium Ion Battery Packs, available in 2.0Ah, No. DCB203, and 4.0Ah, No. DCB204, provide 33 percent longer runtime than standard Dewalt 20V Max battery packs. Compatible with the entire line of 20V Max tools, the battery packs feature a maximum runtime in a lightweight design, weighing as little as 1.34 lbs. Sporting a 3-LED Fuel Gauge System, the batteries allow immediate feedback on the state of charge. Furthermore, the batteries have no memory effect and virtually no self-discharge, resulting in less downtime.