Expect optimum runtime in the 40V range with this Makita power tool battery The BL4020 li-ion battery is designed to power tools in Makita\'s 40Vmax XGT range. It has a 2.0Ah capacity with greatly increased water and drop impact resistance compared to other batteries. Its integrated cooling system increases battery life. Features: Greatly increased water and drop impact resistance Digital communication between the battery and the tool and battery and the charger Battery fuel gauge: 4 LED gauge with a check button Cooling system for maximum battery life Specification: Voltage: 40V Battery capacity: 2.0Ah Battery Type: Li-ion XGT