1.5 AH Lithium-ion battery For use with Makita 18V LXT compact 1/2" driver drill (BDF452HW Ace No. 2189330) Built-in memory chip memorizes the usage history and communicates with the charger Weighs 40% less than Ni-Mh or Ni-Cd Anytime charge - Lithium-ion batteries have no memory effect and can be charged at any time Charging technology controls current voltage and temperature to maximize battery life