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.
Running sbc at higher bitrates than default sound subjectively better than most existing codecs. I use 552 kbit/s regulary and it sound great. Unfortunately the support for higher sbc bitrates is terrible.