Lithium Battery Testing

Hi Guys,
I’ve imported a few different models of 50ah-100ah lifepo4 batteries from various Chinese suppliers.
I’d like to get them opened, tested and put through their paces to see which are of decent quality.
I’ve seen a bunch of posts from members which have done some testing on lithium batteries.

Is there anyone here that knows well how to tell the good ones from the bad ones and could help me with some advanced tests (obviously will pay for your time).