Yes. I just replaced the ones in my wife's Sony earphones by following a step by step guide on ifixit. Cost me $15 for the batteries including shipping, and they're not even any sort of exotic type or size.
Edit: okay just read the article. Guess these are a lot more convenient to replace than the Sony ones.
Smoking is Awesome ( yewtu.be )
Sources & further reading (& quitting strategy links):...
Fairphone Fairbuds launch with replaceable batteries, titanium drivers and ANC ( www.notebookcheck.net )