My wife and I have the Gen4 rings. She's gone through 3 replacements in under 2 years. Seems to be continual battery issues. Supposed to last 5 days and she can barely get a day on a charge. Mine hasn't had any issues so far thankfully!
The Oura Ring 5 is 40 percent more compact than its predecessor and is said to offer greater comfort and a battery life of six to nine days. However, iFixit's teardown video shows that the ring is essentially electronic waste once the battery reaches the end of its life.
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