Milwaukee 48-11-1822 M18 REDLITHIUM™ High Capacity Battery Two Pack

3.0 Amp hour - 54 Watt hour battery. LITHIUM-ION battery delivers long life and run time with fade-free power. Battery fuel gauge - Displays remaining run-time Milwaukee REDLINK™ Intelligence. Overload Protection - Prevents user from damaging their cordless power tool investment in abusive situations. Temperature Management System - Keeps battery in ideal temperature range to provide maximum life.