Bosch BC1880 18V Lithium-Ion Battery Charger Fast-charging to 80 percent  will fast-charge an 18 V 6.0 Ah FatPack battery in only 35 minutes, and a 2.0 Ah SlimPack in only 15 Works with high-amp batteries  fully charges a spent 18 V 6.0 Ah FatPack battery in about 55 minutes Fast charging with standard cells  fully charges a spent 18 V 2.0 Ah SlimPack battery in 30 minutes Cooling fan  protects batteries from overheating while charging Regulated dual-mode charge for cell protection  fast charge to 80 percent, remaining 20 percent is long-life mode