alt Hacker NewsYou're just never going to get a smart ring with a battery that lasts longer than a year or two until different/better battery technology becomes commonplace.
I've had a RingConn ring since December 2024, and I went with them primarily because they don't charge a monthly fee like Oura. But at this point the battery that originally lasted 2 weeks lasts only about 2 days. It's about the best you can expect from a ~30mAh lithium cell. Once it finally dies completely I won't be replacing it.
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-...).