Anyone know of a good place to get replacement phone batteries? I just discovered my dad's Galaxy A12 and my aunt's Galaxy A03s both have very swollen batteries that need replacing. When my Galaxy S7 (RIP) did the same thing some years ago I got the new battery from ifixit, but they don't seem to have parts for either of today's phones in question.

I see batteries listed on both ebay and Amazon, but with these types of site being free-for-all marketplaces now I have no idea which sellers, if any, can be trusted to supply something that won't self-immolate at the first opportunity. For lead acid batteries I normally use MDS, but I don't think they do phone batteries and I don't know of somewhere similar for phone batteries.

Any ideas?