I've got a Fairphone 4 since 4 years and I've bought two replacement batteries so far (one has gone bad and I like to have an extra to swap with if needed). It

I've got a Fairphone 4 since 4 years and I've bought two replacement batteries so far (one has gone bad and I like to have an extra to swap with if needed). It still works very well with CalyxOS so the rational thing to do is to keep using it.