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Deleted member 243478
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A battery is an assembly made up of a chassis and one or more cells, it is entirely possible to replace the cells within the chassis and resell the assembly as a re manufactured battery with Apple markings and such assemblies do exist. The fact that a cell was replaced as a matter of normal ageing and failure doesn't in any way indicate that the assembly didn't originally come from an Apple factory.
Have you even looked inside a Macook? There is no chassis for their lithium batteries... the cells are wrapped in a black film to hold them together and glued to the frame for rigidity. You can easily puncture them with a knife if you take the cover off.
And no you cannot rebuild a battery then claim it is still Apple. By weight you have replaced more than 90% of the original product with parts werent built by Apple. Yes when you put it in a Macbook, it is still a Macbook but that doesnt change the fact that the battery cells are not original.