I am aware that most wireless headphones use built-in batteries nowadays, but strictly speaking, your argument doesn't relate to wireless headphones, but to products with non-replaceable batteries.
The Sennheiser RS180, for example, had rechargeable and replaceable batteries inside. Ironically, mine died a few months ago, but I am still not sure what the cause was.
The Sennheiser RS180, for example, had rechargeable and replaceable batteries inside. Ironically, mine died a few months ago, but I am still not sure what the cause was.