In the first four months after delivery of my ring, the battery lasted more than 10 days as promised by the manufacturer. Then I had to charge it more and more frequently and in the end (after five months) the charge was no longer sufficient for a whole day. I have opened a service case and hope that I got a "Monday model". Otherwise, the ring fulfils my requirements in terms of wearing comfort, data collection, app and non-registration obligation. A real pity.

I can't confirm that. I charge the ring "felt" almost never every 12 or 13 days and that almost 2 weeks, absolutely super part regarding the battery performance