The Makita 18VT LXT Lithium Ion 5.0AH batteries offer up to 65% more run time versus 3.0AH batteries with no added weight or bulk. Lithium Ion batteries offer more cycles over the life of the battery versus NI-CAD and NI-MH batteries. Optimum charging system utilizes 3 active controls (current, voltage and temperature) to maximize battery life. Built-in memory chip communicates with charger CPU to optimize the charging process based on the unique conditions of each battery. For use with Makita's 18VT LXT cordless power tools.