The MILWAUKEE® M18 REDLITHIUM™ XC5.0 Resistant Battery is built with a resistant housing, providing increased protection against exposure to common oils, greases, and solvents found in transportation maintenance and manufacturing environments. The Milwaukee® M18 REDLITHIUM™ XC5.0 Resistant Battery delivers the same best-in-class performance as the standard Milwaukee® M18 REDLITHIUM™ XC5.0 battery with 2.5X more runtime and 20% more power than the standard lithium-ion batteries. Each battery pack is durably built for heavy-duty use, runs cooler, and performs in cold weather climates. Built-in REDLINK™ Intelligence protects the battery from overloads, preventing you from damaging your cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. An integrated temperature management system and individual cell monitoring help to maximize your battery's life. The M18™ REDLITHIUM™ XC5.0 Resistant battery is fully compatible with all 250+ MILWAUKEE® M18™ solutions. In addition to these batteries, this starter kit includes the M18™ & M12™ Battery Charger and contractor bag.