Features and Benefits:Equipped with Star Protection Computer Controls™ to protect against overloading, over-discharging and over-heating;Impact-resistant outer case and shock-absorbing inner-liner are engineered to protect the battery;Sixteen contact terminals maintain a constant connection with the tool to help prevent power loss or fluctuation, even during high-vibration applications;Battery resists self-discharge and remains ready for use even after long periods of storage;Compatible only with Star Protection tools, indicated by the Star Symbol™ and/or Yellow Battery Receiver under the tool;Makita 18V Lithium-Ion is the world�s largest cordless tool line-up powered by an 18V Lithium-Ion slide-style battery;Optimizes battery life by actively controlling current, voltage and temperature;18V LXT Lithium-Ion Battery and Charger Starter Pack, BL1820, DC18SD (2.0Ah)