The MILWAUKEE M12 REDLITHIUM HIGH OUTPUT Battery Packs deliver 25% more power and runs 25% cooler than other Milwaukee M12 REDLITHIUM CP battery packs. This increased performance of these lithium-ion batteries give you the same power and runtime of a MILWAUKEE M12 REDLITHIUM XC battery in a lighter and more compact package. The 12-volt battery packs deliver fade-free power and runs substantially cooler through demanding applications, allowing you to push your cordless power tools throughout a wide range of applications. Their compact, lightweight design allow 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 0F/-18C. In addition, the M12 REDLITHIUM HIGH OUTPUTBattery Packs are built with a resistant housing, providing increased protection against exposure to common oils, greases, and solvents found in transportation maintenance and manufacturing environments. The Milwaukee M12 REDLITHIUM HIGH OUTPUT Battery Packs are fully compatible with 125+ M12 solutions.