Compatible only with Star Protection tools, indicated by the Star Symbol™ and/or Yellow Battery Receiver under the tool Makita’s 18v & 14v batteries have a built in memory chip that records the battery usage history. While the battery is connected it will transmit the data to the charger

Makita 18V Lithium-Ion batteries resist self-discharge so they’re ready for use even after long periods of storage. The Rapid Optimum 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. The 18V Dual Port Rapid Optimum Charger (DC18RD) charges 2 batteries simultaneously, giving tool users unparalleled charging efficiency so their batteries spend more time working and less time sitting on the charger. The DC18RC fast charger, also known as the Makita DC18RC Li-ion 7.2 / 14.4 / 18v LXT Charger, uses Intelligent Charging Technology to control current, voltage and temperature to maximize the battery life. The DC18RC can charges a BL1830B 18v LXT 3.0Ah battery in approximately 22 minutes - and to the fullest charge. The MAKITA DC18RC has a cooling fan and Active 3 Controls. This means that during the loading of the charging voltage, charging current, and temperature is held in the holes. The cooling system blows cool air into the battery. As a result, high temperatures occur in the battery, so that the battery life is extended, and the charging process is accelerated. Equipped with Star Protection Computer Controls™ to protect against overloading, over-discharging and over-heating Makita 18V Lithium-Ion is the world’s largest cordless tool line-up powered by an 18V Lithium-Ion slide-style battery

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A great advantage of Lithium Ion technology is that it provides the user with the possibility to charge the batteries anytime, without any need to wait for their complete power deployment. A great improvement compared to older technologies like Ni-Cad The Makita DC18RD twin 18v Li-ion charger, charges 2 Makita 18 volt LXT lithium-ion batteries simultaneously. The rapid charge technology selects the optimum voltage and current and temperature is controlled by the forced air system that circulates air through the battery to prevent overheating. and a full charge sound alert confirms when the charge cycle is complete. MAKITA DC18RD FEATURES Battery delivers consistent power and run time in extreme temperatures, even in winter (-4°F/-20°C) The Makita Rapid Optimum Charger communicates with the battery’s built-in chip throughout the charging process to optimize battery life by actively controlling current, voltage and temperature

Built-in CPU - gathers information from the battery's memory chip to determine optimum charging method Built-in fan circulates air through the battery during the charging process to cool the battery for faster charge time Makita LXT® is the world’s largest cordless tool system powered by 18V Lithium-Ion slide-style batteries. At the heart of the LXT® System is the 18V LXT® Lithium-Ion battery and the efficient Rapid Optimum Charger. The 18V Lithium-Ion Dual Port Rapid Optimum Charger (DC18RD) charges two batteries at the same time, giving tool users unparalleled charging efficiency so their batteries spend more time working and less time sitting on the charger.