The Milwaukee M14 - M18 Multibay Multi Voltage Charger charges up to 6 batteries sequentially. By using by-pass mode, you can select the battery bay that gets charged first. It has a compact design, integrated hang holes for vertical mounting, a pass through plug to conserve outlet space and a convenient carrying handle. With this new six pack charger, users can reduce the amount of time spent changing out batteries, increasing productivity on the jobsite. Specification Battery Pack Capacity: 2.0, 4.0 & 5.0Ah. Charging Time: 40/80 Minutes. System: M14™ & M18™.