Amazon.com: Replacement Battery Part No.3731,3738 for Oral-B Professional Care 8000,Professional Care 8300,Professional Care 8500,Professional Care 9500,Triumph 4000,Triumph 5000,Triumph 9000,9400,9500,9900 : Health & Household
Braun Oral-B Triumph v1 Battery Replacement Guide
Electric Toothbrush Battery 3731,3738 for Oral-B Triumph 4000,5000 ,9000,9400,9500,9900,Professional Care 8000,8300,8500,9500
Amazon.com: Replacement Battery compatible with Braun Oral-b Triumph Professional Care Toothbrush, 42 mm L X 17 mm D : Health & Household
Premium Battery for Oral-B 3738, 3731, Triumph 9900, Professional Care 9500 NEW | eBay