Amazon.com: KCDE Replacement Battery for Oral-B 9900 Toothbrush, Professional Care 8000, Professional Care 8300, Professional Care 8500, Professional Care 9500, Triumph 4000, Triumph 5000(2500mAh / 3.00Wh) : Health & Household
Braun Oral-B Professional Care 9900 Triumph Ni-MH battery Replacement - iFixit Repair Guide
3731 3738 Battery for Oral-B Triumph 4000 /5000 /9000 /9400 /9500 /9900 NEW | eBay