Braun Oral-B Professional Care 9900 Triumph Ni-MH battery Replacement - iFixit Repair Guide
Amazon.com: Replacement Rechargeable Battery Compatible with Some Selected Braun Oral-b Triumph Professional Care Toothbrush, Panasonic NiMH with Narrow Metal Tabs, 50 mm Long, 17 mm Diameter : Health & Household
Oral-B Battery Replacement on Triumph 9000/5000 Professional Care Braun Toothbrush - YouTube