My hearing aids are Oticon - Opn S 1, I need to replace my re-chargeable batteries. They instruct you to take it to a professional to change the batteries. Is it not possible for me to buy the tool to open the door and change it myself ? Doesn’t seem that it would be complicated to do. I assume the battery is a 312 ? Would appreciate comments and recommended battery brand. Assume as well, I can buy the batteries on Amazon. Thanks
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