The Milwaukee M12 Redlithium High Output CP2.5 Battery Pack is a powerful and reliable battery pack that delivers 25% more power and runs 25% cooler than other Milwaukee M12 REDLITHIUM CP battery packs. This increased performance of the lithium-ion battery gives you the same power and runtime of a MILWAUKEE 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. Its compact lightweight design allows you to work in tight workspaces and reduces fatigue. Each battery pack is durably built for heavy-duty use, runs cooler, and performs in climates below 0?F/-18?C. In addition, the M12 REDLITHIUM HIGH OUTPUT CP2.5 is built with a resistant housing providing increased protection against exposure to common oils, greases, and solvents found in transportation, maintenance, and manufacturing environments.