Thanks for raising this again.

Bose actually sent me a new pair when I reported it had a red light when charging
https://cubicgarden.com/2019/12/29/after...

Its similar to the previous ones but all black instead. I did look at taking it apart previously but it seems to have those clips which once opened never go back to their default state, they tend to break under a small amount of pressure.

After the Bose battery goes again, I'm going to study iFix for a on ear bluetooth & lead, multipoint headphones.