The MILWAUKEE M12 REDLITHIUM CP2.0 Started Kit includes two M12 REDLITHIUM CP2.0 Compact Batteries (48-11-2420) and one M12 Charger (48-59-2401). The compact batteries deliver up to 2X more runtime, 20% more power, and 2X more recharges than standard lithium-ion batteries. The Milwaukee M12 Battery Packs feature superior pack construction, electronics, and performance, giving users more work per charge and more work over pack life than any batteries on the market. Each durable battery pack is built for heavy-duty use, runs cooler, and performs in climates below 0°F/-18°C. Their compact, lightweight design allows for work in tight workspaces and reduces user fatigue. Built-in REDLINK Intelligence protects the batteries from overloads, preventing users from damaging their cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. An integrated temperature management system and individual cell monitoring help maximize battery life. This M12 Battery and Charger Kit is fully compatible with the M12 System.