Here's a [https://toothbrushbattery.com/guides/braun-oral-b-professional-care-type-4729-battery-replacement/|guide] that shows how to replace the battery in a Braun 4729 and a ***''3746''*** toothbrush.
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Please confirm the model number of your toothbrush?
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In this [https://www.ifixit.com/Answers/View/898524/Replacement+of+the+battery|question] you said it was a Braun 3756 and in the question above it's a 3746.
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They don't open the same way so showing the correct model number is important
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If it is a Braun 3746 model, here's a [link|https://toothbrushbattery.com/guides/braun-oral-b-professional-care-type-4729-battery-replacement/|guide] that shows how to replace the battery in a Braun 4729 and a ***''3746''*** model toothbrush.
Hi @youssefsalib
Here's a [https://toothbrushbattery.com/guides/braun-oral-b-professional-care-type-4729-battery-replacement/|guide] that shows how to replace the battery in a Braun 4729 and a ***''3746''*** toothbrush.