So funny you mention this. If I wind up returning my M50 for battery replacement (unlikely since I haven’t for so long) I will mark the internal frame in some manner to hopefully answer that question. I think @tenkan noted he was an engineer and suspected the battery can be swapped. He is probably correct. At some point they will be doing battery swaps and the actual hearing aid model will have long been out of production.
@BeLo That leads us to your expertise. Knowing that they need a battery that will be off-the-shelf years after the hearing aid model production has ceased would lead me to believe they have used something they suspect will be available. Any thoughts on how we could match measurement data from @sterei scans to readily available batteries ?