The newest Milwaukee 12-volt Lithium-ion battery works on the M12 Cordless Tool System and has 4-Amp hours of run-time. Milwaukee’s M12 Red lithium XC4.0 provides up to 2X more run-time, 20% more power and 2X more recharges than a standard Lithium-Ion battery. Red lithium XC4.0 also delivers best-in-class performance in extreme job-site conditions. With Milwaukee durability built into each pack, the Red lithium XC4.0 battery operates cooler and performs in climates below -18C/0F with fade free power.