I e-mailed Contour asking if they offer a replacement battery for the ROAM 2 once the lifecycle of the internal battery is over. I got an automated response:
Hi Agent pombero,
Thanks for emailing Contour!
We have received your request and are working on responding to you as soon as possible. If you have any additional information to add to this case, please reply to this email.
Our normal business hours are 8-5 PST Mon through Fri. Please allow up to 24 hours for a response.
Thanks in advance for your patience. We look forward to assisting you.
Thanks,
Contour
I'll post here once I get a response.