18V LXT® lithium ion, dual port charger. Two built-in fans circulate air through the batteries during charging to cool the batteries. Charges two 18V Compact lithium-Ion 2.0Ah batteries in only 25 minutes. Charges two 18V LXT® lithium-Ion 3.0Ah batteries in only 30 minutes. Charges two 18V LXT® lithium-Ion 4.0Ah batteries in only 40 minutes. Charges two 18V LXT® lithium-Ion 5.0Ah batteries in only 45 minutes. Charges two 18V LXT® lithium-Ion 6.0Ah batteries in only 55 minutes.