Bowers & Wilkins P5 Mobile Headphones Review | Page 12 | Headphone Reviews and Discussion - Head-Fi.org
Looks like it may be possible to replace the battery in the new PX8 for future reference. At least going off the PX design… if you are brave enough 😆 : r/headphones
Replacement Repair Parts For B&W Bowers & Wilkins PX8 Headphones Headband,rubber cushion,Ear Pads Ear Covers Headset Eva Case - AliExpress