I would like to use the devices for as long as possible and also tried to change the battery myself. Although I was able to order the correct battery type after researching on the Internet, the installation did not work. Apparently there is something built into the headphones that checks the battery type and does not allow the headphones to start (red flashing light).
For this reason, I had to buy a new pair of headphones (not from Sony). I paid attention to reparability and bought a good pair of Bluetooth headphones.

Unfortunately, we have no experience of this ourselves. However, we recommend that you ask such a question as a discussion, as experience has shown that more customers respond there than to a single question.
This item is on sale and no longer available from the supplier. Therefore, we unfortunately no longer receive any information about this item.