Many products come from same factorys it true but the spec they are built to for every supplier can be fully different.
To meet correct certification certain rules have to be followed and materials and only approved factorys to be used. getting the cells approved is costly for EU import rules, but gives you the best assurance the products are made to strict spec and safety regulations.
Its the same for electronics and other manufacturing from overseas.
There are batteries and electronics on the market from overseas that are just dangerous and don't pass regulations.
You pay your money and take your chances.
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