Li-Ion Battery Charger Makita Dc18Sd. The Rapid Optimum Charger offers key advantages for Makita 18V Lithium-Ion cordless tool users. The exclusive built-in fan cools the battery (sold separately) by forcing air through the battery's air vents during the charging process for faster charging. The charger communicates with the battery's built-in chip throughout the charging process to optimize battery life by actively controlling current, voltage, and temperature. The result is category-leading battery charge times, which means the battery spends more time working and less time sitting on the charger. SPEED - Charges 18V LXT 2.0Ah battery in 25 minutes, 3.0Ah in 30 min., 4.0Ah in 40 min., 5.0Ah in 45 min. TECHNOLOGY - Communicates with the battery's built-in chip during the charging process to optimize battery life INNOVATION - Built-in fan cools the battery during the charging process for faster charge time HIGH-PERFORMANCE - Optimizes battery life by actively controlling current, voltage, and temperature. The built-in fan circulates air through the battery during the charging process to cool the battery for faster charge time. INCLUDES - Includes charger only