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.
The low-end Chinese IEMs from the likes of MOONDROP, TRUTHEAR, etc. in that $20 range are surprisingly good if anyone is interested in picking up a spare.
I ended up getting a CCA CRA pair, and they’re surprisingly good too. Currently $22 for a pair with a mic. It was either those, or MOONDROP, but I think either of them would be well worth the 20 bucks