How to repair an Oral B electric toothbrush - YouTube
Braun Oral-B Professional Care Toothbrush Repair Battery 50Lx17D, Narrow tabs | eBay
Amazon.com: Replacement Battery Compatible with Braun Oral-b Professional Care Toothbrush, 1150 mAh, Panasonic NiMH, 42 mm Long, 14 mm Diameter : Health & Household