18 V LXT 3.0ah Lithium-Ion battery twin pack. Makita's LXT batteries offer extended run time and more cycles over the life of the battery versus Ni-Cad and Ni-MH batteries. A built-in memory chip with sixteen firm holding contact terminals reduces the risk of power loss/fluctuation and communicates with the charger's cpu to optimize the charging process based on the unique conditions of each battery. Charging at any time will have no effect on the battery. More power, less weight and a better fit. 1-Year warranty.