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.
Oral-b Triumph 4000, Triumph 5000, Triumph 9000 replacement battery
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ORAL-B-BRAUN-TRIUMPH-PROFESSIONAL-CARE-TYPE-3745-TOOTHBRUSH-W
ORAL-B BRAUN TRIUMPH PROFESSIONAL CARE TYPE-3762 TOOTHBRUSH-W
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ORAL-B-BRAUN-TRIUMPH-PROFESSIONAL-CARE-TYPE-3745-TOOTHBRUSH-W
ORAL-B-BRAUN-TRIUMPH-PROFESSIONAL-CARE-TYPE-3762-TOOTHBRUSH-W