No, quality control is never based on external packaging, for anything*, since quality control is about the objective quality of the final product: if you're not measuring it, you're not controlling that parameters quality. For batteries, this includes things like x-ray to verify all the layer geometries and assembly, materials, etc [1].
nomel|7 months ago
[1] Battery tester: https://www.youtube.com/watch?v=t3IE3npEcuc
*unless the product is visible external packaging.