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.