This is the main reason I abandoned the idea of privately importing LiFePO4 prismatic cells. Even if you stick with Sinopoly or Winston cells, there are a multitude of suppliers marketing look alike cells so you still cannot be sure that you are getting the genuine article. Purchasing from a local supplier with a sound warranty makes sense when making a substantial outlay for something that should provide 15 years or so of reliable service.
The Oceanstore manufactured cells marketed in the past by AA Solar as "ABAT" are what I have purchased for our new van. They are second hand, but the price was right and they appear to be in pretty good shape. The new owners of AA Solar are no longer stocking these - mainly due to reliability of supply issues.
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2019 Elddis Supreme 860. 800 w solar 300 AH Lithium
2015 Jeep Grand Cherokee Diesel 8 Speed.