Milwaukee 48-11-1811 M18 Compact 1.5 Ah Battery - 2 Pack N/A Made in USA and Imported 1.5 Amp hour - 27 Watt hour battery LITHIUM-ION battery delivers long life and run time with fade-free power Battery fuel gauge - Displays remaining run-time 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