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The iO, released in 2020 is an electric toothbrush by Oral-B. It is able to connect to your smartphone via Bluetooth and gives you realtime 3D teeth tracking. Model: Oral-B iO 9

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Can't start after replacing battery

Hi, why my oral b io doesn't work after battery replacement? The guide is fool proof however, something goes wrong.

Thanks for your help

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Hi @juanpulag,

Did you put the battery in the correct way? Maybe double check.

Did you charge the battery first after installing it, before attempting to turn on the toothbrush?


What battery type did you replace with? Do you have a multimeter?


@andrewsawesome Hi Andrew, thanks... I don't have a multimeter, so I can say that even the original battery doesn't start the brush.

What can I do with a multimeter? Thank for your answer....


@juanpulag I was going to ask you to check the voltage of the battery with a multimeter.


@jayeff hi, neither new and old battery works, the brush just shut down permanently... So sad, that's was something easy to solve "was"


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Gekozen oplossing

Sorry to be late to the party, but a german user just posted a comment with the same problem and the solution: He managed to reset the io via the app and it works flawlessly since then.

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Diego zal eeuwig dankbaar zijn.

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