3M BC-210 Battery Charger, Nickel Metal Hydride. More details: Battery Charger, For Use With Mfr. No. BP-15, 520-15-00, Includes Loose Fitting Headgear, Battery Powered Blower, Charger Power Base, Adapter Module, Cord, Material Nickel Metal Hydride, Standards NIOSH Approval TC-23C-2071 and 2