Chosen Solution
Is there a trick to replace the batteries? I found we can find some on ebay…
Replacing the battery requires heat, and soldering/desoldering. I plan on fixing mine either today or tomorrow. There is a good tutorial on YouTube. You have to make sure you get the battery for the Soundsport Free Wireless, not the Soundsport Free. They aren’t interchangeable as far as I’ve found.
It seems you can get parts here and a teardown and battery replacement video is here