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.
Not sure why you’re getting downvoted. I’m a person with ears that do not work with silicone tips either. I love the fit of AirPods. Tried AirPods Pro, and for my ears, they suck. Doesn’t matter what size tips I use, they seal poorly and fall out constantly. Regular AirPods fit great.
Edit: grammar
Edit 2: that being said, I want to try these because I really want replaceable batteries for my earbuds. It may be moot for me though as I live in the US and currently they aren’t shipping to the US.