Delivers up to 2.5X more run-time, 20% more power and 2X more life than standard lithium-ion batteries. The M18(TM) REDLITHIUM(TM) XC 5.0 extended capacity battery pack features superior pack construction, electronics, and performance to deliver more work per charge and more work over the life of the pack than any battery on the market. | Milwaukee Tool M18 REDLITHIUM XC5.0 Extended Capacity Battery Pack