Should a new used EV owner replace their 12v battery? And with something better?

Should a new, proud owner of a used EV with, let’s say 20-30k miles, have the factory 12v battery replaced just as a precautionary measure? Secondly, should that factory battery be replaced by a better battery like a Diehard or Delco AGM battery? In other words, are the factory batteries inferior by definition? I know there are a lot of problems related to the draining of the 12v battery that are not due to the battery itself, but can the problems be mitigated somewhat by a better battery if there is such a thing?