With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
I’ve had three sets of earbuds where the right one has died of no apparent cause shortly after the warranty expired.
I’m starting to think it’s intentional.