You can, however, design rings that can have their comparatively cheap batteries replaced, and be transparent about the expected life span of your $500+ ring th

You can, however, design rings that can have their comparatively cheap batteries replaced, and be transparent about the expected life span of your $500+ ring that requires a subscription and whose warranty specifically excludes the battery (https://support.ouraring.com/hc/en-us/articles/360025439534-Warranty-FAQs#:~:text=Consumable%20parts%2C%20including%20batteries https://support.ouraring.com/hc/en-us/articles/360025439534-...).