Amazon.com: Replacement Battery compatible with Braun Oral-b Triumph Professional Care Toothbrush, 42 mm L X 17 mm D : Health & Household
Braun Oral-B ProCare/Triumph Repair: How to replace Rechargeable Battery - YouTube
Braun Oral-B Triumph v2 Battery Replacement Guide
Amazon.com: FITHOOD Replacement Battery for Oral-B 3738 Triumph 9000 Professional Care 8000 Professional Care 8300 Professional Care 8500 Professional Care 9500 Triumph 4000 : Health & Household
Amazon.com: FDK Replacement Battery Compatible with Braun Oral-b Triumph Professional Care (Type 3731 or 3745) Toothbrush (48mm Long, 17mm Diameter, 2700mAh) : Everything Else