"LXT Lithium-Ion battery and optimum charging system produces 280 more lifetime work with 2x more cycles. 40 lighter than traditional 18V batteries. Batteries qty. 1, Battery Type Lithium-ion, Volts 18. 5x Lower self-discharge keeps battery cells active and ready for use, even after long periods of storage Charging at any time will have no effect on the battery Built-in shock absorbing features protect the battery 16 firm holding contact terminals reduce the risk of power loss/fluctuation in high vibration work environments Battery's built-in Memory Chip communicates with the charger to maximize battery life using 3 Active Controls Current, Voltage & Thermal"