Accepts 18V BL1815N / BL1830B / BL1840B / BL1850B Li-Ion batteries#Dual-Port design enables two batteries to be charged simultaneously#Optimum charging system regulates thermal, voltage and current during charging cycle to ensure battery cannot be overcharged or overheated during the charging process#Central Processing Unit (CPU) in battery communicates with charger to analyze battery and charge according to its unique condition #Forced Air Cooling Fan keeps battery at optimum charging temperature and prevents over heating #Digital Power Display indicates condition of battery and current charge level (-80%, +80%, 100%)#USB port enables convenient charging of mobile devices on the job site#Charges 2 x 18V Li-Ion compact batteries in 15 minutes!#Charges 2 x 18V Li-Ion 3.0Ah batteries in 22 minutes!#Charges 2 x 18V Li-Ion 4.0Ah batteries in 36 minutes!#Charges 2 x 18V Li-Ion 5.0Ah batteries in 45 minutes!#