Build your own Makita tool kit with the 18V LXT® Lithium-Ion Battery and Charger Starter Pack (4.0Ah) (BL1840BSC2). Makita offers over 325 cordless tools, and most are available as "bare tools" (tool only, no batteries or charger included). Pick up the Starter Pack, then purchase the 18V "bare tools" you need to get the job done – including 18V X2 LXT® tools powered by two 18V batteries. It's an ideal way to start building a Makita cordless tool line-up.Makita 18V Lithium-Ion batteries resist self-discharge so they're ready for use even after long periods of storage. The Standard Charger is a smart charging system that communicates with the battery during charging to monitor current, voltage, and temperature. This advanced charging technology helps optimize battery life and deliver a faster charge. For improved tool performance and extended battery life, Makita created Star Protection Computer Controls™. Star Protection is communication technology that allows the tool and battery to exchange data in real time and monitor conditions during use to protect against overloading, over-discharging, and overheating. Makita, the innovation leader in cordless tool technology, has the world's largest cordless tool line-up powered by 18V lithium-ion slide-style batteries.