The battery can be bought either on or . Verify with your old battery before purchase as Oral-B uses shorter battery outside of USA. The
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HQRP 49x17mm Battery for Braun Oral-B Triumph ProCare 9900 9500 9400 9000 3731 Toothbrush Replacement
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Braun Oral-B Triumph Professional Care 9000 series Electric Toothbrush Battery Replacement
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 4729 Battery replacement - iFixit Repair Guide
Battery Replacement Guide for Braun Oral-B Type 4729 Toothbrush - Professional Care
Replace a 2700 mAh battery compatible with the USA model Oral-B Professional Care or Triumph electric toothbrush. 48.5 mm long. 17 mm diameter.
Oral-B Professional Care or Triumph (USA Model) Battery
Oral-B Professional Care or Triumph (USA Model) Battery
Braun Oral-B Type 4729 Professional Care Battery Replacement
Oral-B iO Battery Replacement - iFixit Repair Guide