2 Pack, 18V LXT Lithium-Ion 5.0Ah Battery, Integrated LED Battery Charge Level Indicator Allows User To Monitor Battery Charge, Provides Up To 65% More Run Time Per Charge, Reaches Full Charge In 45 Minutes Or Less, Compatible With 18V LXT Tools, Battery Delivers Consistent Power & Run Time In Extreme Temperatures, Even In Winter -4 Degrees Fahrenheit & -20 Degrees Celsius, Star Protection Allows The Tool & Battery To Exchange Data In Real Time To Protect Against Overloading, Over Discharging & Over Heating.