Integrated L.E.D. battery charge level indicator allows user to monitor battery charge Provides up to 50% more run time per charge compared to BL1815 18V Compact Lithium-Ion 2.0Ah battery reaches a full charge in 25 minutes or less Battery delivers consistent power and run time in extreme temperatures, even in winter (-4DegreeF/-20DegreeC) Equipped with Star Protection Computer Controls to protect against overloading, over-discharging and over-heating