Battery Replacement Guide for Braun Oral-B Type 3766 & 3767 Toothbrush - Pro 2 3 4 2000 3000 4000 - YouTube
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
Replacement Battery for Braun Oral B Triumph 5000 9000 9500 9900 Electric Toothbrush Batteries 49mm x 17mm - AliExpress