The Milwaukee 48-59-1806 is a M18 Sequential 6 Port Charger. The charger holds up to 6 batteries at a time, and charges them sequentially, 1 at a time. The charger also offers a compact design, integrated hang holes for vertical mounting, and a pass through plug to conserve outlet space. The new unit will charge M18 compact batteries in 30-minutes, and extended capacity (XC) batteries in 60-minutes.