Redlithium™ High Output™ XC6.0 Battery Packs, Lithium-Ion, 18 V, 6 AhPack of 2 Provides 50% more power and runs 50% cooler vs M18 Redlithium XC battery packs Delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before Provides increased power in extreme cold weather conditions (below 0F 18C) and delivers more work per charge Powers more than 150 M18 cordless solutions Onboard fuel gauge displays remaining run time