The MILWAUKEE® M18™ REDLITHIUM™ 3-Pack Battery Set includes 1 HIGH OUTPUT HD12.0 Battery Pack and 2 M18™ REDLITHIUM™ XC 5.0 Ah Battery Packs. The HIGH OUTPUT HD12.0 Battery Pack provides 50% more power and runs 50% cooler than M18™ REDLITHIUM™ HD battery packs. The massive increase in power elevates the performance of the entire M18™ System and drives the next breakthrough in M18 FUEL, delivering the power of 15 Amp corded products. It provides fade-free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before. It provides the most work per charge of any professional power tool battery in the industry, driving full corded replacement on the jobsite. The 2 included M18™ REDLITHIUM™ XC 5.0 Ah Battery Packs deliver up to 2.5X more runtime, 20% more power, and 2X more recharges than standard lithium-ion batteries. These lithium-ion battery packs feature superior pack construction, electronics, and performance, providing more work per charge and more work over pack life than any battery on the market. Built-in REDLINK™ Intelligence protects both types of batteries from overloads, preventing damage to cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. Integrated temperature management systems and individual cell monitoring help to maximize battery life.