This troubleshooting video can teach you how to properly insert the ZPower rechargeable batteries into your Oticon Opn Rechargeable hearing aids, and will …
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Oticon Opn™ Rechargeable – How-to guide on inserting batteries

This troubleshooting video can teach you how to properly insert the ZPower rechargeable batteries into your Oticon Opn Rechargeable hearing aids, and will …
source