Red Lithium advantage performance. Up to 40% more run-time. 20% more speed. 20% more torque. 1.5 Amp hour, 27 Watt hour battery. Battery fuel gauge displays charge status on tool. Durable. Operates down to 0F. Runs 20% cooler. Up to 50% more recharges. Equivalent run-time with 40% less weight than a compact 18V NiCd battery. Lithium-ion battery delivers long life and run-time with fade-free power. Best in class construction. Integrated weld frame. Cell separator. Impact and vibration protective rubber.