The battery is soldered onto the circuit board in an electric toothbrush. Replacing battery requires soldering and toothbrush dis-assembly skills. For your information, Braun Oral-B Professional Care Toothbrush uses the following battery sizes.
Braun Oral-B Professional Care 9900 Triumph Ni-MH battery Replacement - iFixit Repair Guide
Replacement Rechargeable Battery Compatible with Braun Oral-b Triumph Professional Care Toothbrush, NiMH with metal tabs, 43 mm Long, 17 mm Diameter : Health & Household
Braun Oral-B TRIUMPH Electric Toothbrushes for sale
Replacement Toothbrush Battery for Braun Oral-b Triumph Type 3731
Braun Oral B TRIUMPH V2 Toothbrush Battery + Replacement Service and MORE
HQRP 42mm Long Battery for Braun Oral-B 5000, 3745, 3761, 3762, 5000 Toothbrush Repair 2000mAh Oralb Professional Care Triumph Sanyo 346 Sanyo346
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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
FDK Replacement Battery Compatible with Braun Oral-b Triumph Professional Care (Type 3731 or 3745) Toothbrush (42mm Long, 17mm Diameter, 2150mAh) : Everything Else
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You can enjoy a new life of your toothbrush in a fraction of the cost of the new set. I use specially designed tools to ensure the highest quality
Braun Oral B TRIUMPH V2 Toothbrush Battery + Replacement Service and MORE
Braun Oral B TRIUMPH V2 Toothbrush Battery + Replacement Service and MORE
Replacement Toothbrush Battery for Braun Oral-b Triumph Type 3731
This battery is specifically designed with low resistance in order to maximize usable capacity. One New FDK OEM NiMH Battery with Narrow Tabs. for
Oral-B Triumph Professional Care Toothbrush Repair Battery, FDK OEM 43mmLx17mmD
Braun Oral-B Triumph v1 Battery Replacement Guide