Makita MAK-196406-9 18V 4Ah Li-Ion Battery BL1840 (2-Pack)

4.0 Ah battery offers 33% increased run time versus 3.0 Ah batteries with no added weight or bulk. LED charge level indicator displays the approximate remaining battery power FEATURES: Battery Protection System provides Over-Discharge, Temperature and Current Protection for enhanced performance Li-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 & 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