M18 18-Volt Lithium-Ion HIGH OUTPUT CP 3.0Ah Battery Pack (2-Pack)The Milwaukee M18 Redlithium High Output CP3. 0 Battery Pack provides 50% more power and runs 50% cooler than most other batteries. The result is the same power and runtime of a M18 REDLITHIUM XC battery with a lighter, more compact package. It delivers fade free power and runs cooler through even heavy applications, allowing you to push your cordless tools through a wide range of jobs. This battery is fully compatible with all 175+ Milwaukee M18