Makita's 18V Lithium-In Rapid Optimum 4-Port Charger, No. DC18SF, helps technicians charge multiple Makita 18V batteries at once. It comes engineered with two controllers allowing for quicker charges. The controller directs charging energy to the battery, allowing for two batteries to be charged in as little as 30 minutes and four in 60 minutes. The charger features "Active 3 Controls" battery-monitoring technology monitoring current, voltage and temperature. This Energy Star certified charger also features indicator lights that provide updates on the charging status of each battery and a compact design.