You don't need to know anything about the Chinese QA process. This is how QA is done for literally everything. What exactly do you thing QA is? The cheap batteries you buy from ebay are batteries that were rejected to sell at a store in the west, and rejected to sell at a store in the east.

I'm not trying to change your mind on anything here, as you seem to have your mind set before bothering to spend even a minute looking up something you stated yourself you know nothing about.