Milwaukee Tool M12™ Redlithium™ High Output Battery Packs Delivers 25% more power and runs 25% cooler than our other M12 REDLITHIUM™ CP battery packs. This increased performance of the lithium-ion battery gives you the same power and runtime of an M12 REDLITHIUM™ XC battery in a lighter and more compact package. The 12-volt battery pack delivers fade-free power and runs substantially cooler through demanding applications, allowing you to push your cordless power tools throughout a wide range of applications. . Pack of 1