This battery and charging set by Makita is ideal to charge bulk tools. The dual-port rapid charger charges two 18 V lithium-ion batteries simultaneously. The batteries will be charged in just 45 minutes. The charging system incorporates 3 active controls (current, voltage and temperature) that provide an optimal charge and ensures batteries cannot be over-discharged or overheated during the charging cycle. The central processing unit (CPU) in the battery communicates with the charger to analyze batteries and charge according to its unique condition. The device indicates the condition of the battery and current charge level (-80%, +80%, 100%) with the digital power display. The set includes two 18 V lithium ion BL1850B (196675-2) and one rapid charger (DC18RD). It is backed by a limited 3-year warranty.