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.
Strange how I’ve been using wired headphones with my phones until two years ago, even though I haven’t had a phone with a headphone jack since 2017…