Reasonably priced LiFePO4 Lithium batteries - quality?

There are at least two youtubers whose channels go about testing various solar components, lithium batteries in particular. Will Prowse is my favorite, at https://www.youtube.com/@WillProwse. His findings occasionally turn up well made LiFePO4 economy batteries, as well as stinkers among the low cost batteries. He tests them for output as well as tears them apart to examine components, and test internal thermal sensors.