Electronics Repair Questions? Ask an Electronics Technician
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Yes, a new battery can be put into a Phonak device. Their FAQ states that if FM reception is lost, one of the things to try is "Insert a new battery into the hearing system."
However, this indication is to some extent contradicted by another piece of Phonak documentation for the SmartLink+, that says the battery is 'non-removable'. So which is it?
The battery is a rechargeable battery, of lithium-ion type. It requires 2 + hours charging to work again once it is discharged completely. Have you tried that recharge time?