Milwaukee M18 REDLITHIUM CP3.0 18 volt 3 Ah Lithium-Ion Battery and Charger Starter Kit 2 pc.The M18 REDLITHIUM HIGH OUTPUT CP3. 0 Battery Pack provides 50% more power and runs 50% cooler vs M18 REDLITHIUM CP battery packs. This provides the power and runtime of an XC battery while maintaining a compact size to reduces weight and fatigue. It delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before. The REDLITHIUM HIGH OUTPUT CP3. 0