I purchased the headphones 8.31.18 (9 days ago) and used them until the battery ran out. Once the battery ran out, I plugged them into my computer USB port and the red battery light started blinking. I let them sit for 2 hours and they won't turn on. I tried charging them with a phone adapting wall port, let them sit for two hours with the red light blinking, still won't turn on. I tried using a different charger on a different outlet, red light started blinking, sat for two hours, still won't turn on.
Thanks for posting and welcome to the community! It looks like you have done a lot of troubleshooting, thanks for that. At this time it looks like the best thing would be for you to reach out to your local Bose support team for assistance. Here is a link you can use. Click on your country, scroll down to "Contact Us".