The AC50 is a battery charger for the BAT50 batteries. The AC50 can charge up to four BAT50s simultaneous with additional reserve slots for four extra batteries. Charge time is 2.5 hours. Specifications: Power Supply Wall plug with switchable adapters Input Voltage: 85 – 264VAC; 100 – 240VAC; nominal Output Voltage: 5V; 3A MTBF (min.): 200,000 hours demonstrated Temperature Operating: 32°F - +122°F (0°C - +50°C) Storage: -40°F - +176°F (-40°C - +80°C Humidity: 0 – 95%, non-condensing Dimensions: 5.4in W x 1.4in H (137.2mm x 35.6mm x 162.6mm) Weight: 3.5lbs (1.59kg)