Milwaukee 48-11-1840 M18 REDLITHIUM XC 4.0 Extended Capacity Battery Pack N/A Imported Red Lithium XC 4.0 Battery Pack that Provides Up To 2 Times More Run Time,20 Percent More Power and 2 Times More Recharges Runs Cooler and Performs In Climates Below Zero Degrees Battery Features Overload Protection To Prevent Damage To Cordless Power Tools In Heavy Duty Situations