Up to 2 times more runtime, 20% more power and 2 times more recharges than standard lithium ion batteries. Superior pack construction, electronics, and performance to deliver more work per charge and more work over pack life than any battery on the market. 4.0 amp-hours of runtime. Runs cooler and performs in climates below 0� F. Managed by Milwaukee’s exclusive REDLINK™ intelligence. Features overload protection to prevent damage in heavy duty situations. Discharge protection prevents cell damage. Fuel gauge displays remaining runtime. Warranty: 3 years.