Makita 18 Volt Lithium-Ion is the world's largest cordless tool line-up powered by 18 Volt Lithium-Ion slide-style battery. At the heart of the LXT series are the 18 Volt LXT Lithium-Ion battery and the efficient rapid optimum charger. The new 18 Volt Lithium-Ion 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 18 Volt dual port rapid optimum charger offers key advantages for Makita 18 Volt Lithium-Ion cordless tool users. The exclusive built-in fan cools the battery 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 charge times: two 18 Volt compact Lithium-Ion 2.0 Ah batteries in only 25 minutes; two 18 Volt LXT Lithium-Ion 3.0 Ah batteries in only 30 minutes; two 18 Volt LXT Lithium-Ion 4.0 Ah batteries in only 40 minutes; two 18 Volt LXT Lithium-Ion 5.0 Ah batteries in only 45 minutes.