The Makita LXT Lithium-Ion battery and charging system offers 280% more lifetime work with 2x more cycles. It features a 5x lower self-discharge rate, keeping cells active and ready for use even after long storage. Charging at any time has no negative effect on the battery. Built-in shock-absorbing features protect the battery, and sixteen firm holding contact terminals reduce power loss or fluctuation in high vibration environments. The battery's built-in Memory Chip communicates with the charger to maximize battery life using 3 Active Controls (Current, Voltage, Thermal). This battery is suitable for all Makita li-ion LXT 18-volt machines. Makita's STAR Protection Computer Controls allow the tool and battery to monitor conditions and exchange data in real time, protecting against overloading, over-discharging, and overheating. STAR Protection prevents cutting power during high-drain applications to protect your tool and battery. It also monitors charge capacity, cutting power if the battery is too low to complete an application, thereby extending battery life. Overheating protection is also a key feature.