The Milwaukee M12 Redlithium XC6.0 Battery 2-Pack delivers up to 3x more runtime, 20 percent more power and 2X more recharges than standard lithium-ion batteries. The lithium-ion battery pack features superior pack construction, electronics, and performance, providing more work per charge and more work over pack life than any battery on the market. The rechargeable battery also delivers 6.0 amp-hours of runtime. Each Milwaukee battery pack is durably built for heavy-duty use, runs cooler, and performs in climates below 0 deg. F /-18 deg. C. Its compact, lightweight design allows you to work in tight workspaces and reduces fatigue. Built-in Redlink Intelligence protects the battery from overloads, preventing you from damaging your cordless power tools in heavy-duty situations, while discharge protection prevents cell damage. The batteries' integrated temperature management system and individual cell monitoring help to maximize battery life. Milwaukee's Redlithium Xc6.0 Battery Pack instantly upgrades the runtime and durability of Milwaukee M12 cordless tools.