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.
Every earbud I had broke at least once during their warranty period. My linkbuds S recently broke the third time. Only one of my issues was battery related, but its still nice to have the option to use them after the warranty ends.