1 x Milwaukee Battery at 18 V, 2.0 Ah Milwaukee Battery is a sophisticated electronic with REDLINK™ intelligence Battery has overload protection that prevents user from damaging their cordless power tool investment in abusive situations Battery features temperature management system that keeps battery in ideal temperature range to provide maximum life Individual cell monitoring of this battery ensures optimal charge and discharge for maximum life Battery has up to 2X more run time, 20% more power, and Up to 2X more recharges*. Compared with other Lithium-Ion technologies and / or with previous MILWAUKEE® battery technology. Results depend on voltage, tool, and application. Battery has integrated weld frame & cell separator