you got to look at why they are being homologated to be honest... they are tested to see if they withstand impacts and damage to the cell, which can happen in the racing enviroment. Some of the cells would be fine if run in, say a B4, as if you can damage your cells in there... the car is mostly a write off. But you can't say, well if you cells are in the center of the car, you can use any cells, but if your cells are exposed, you can only use these cells....
Some of the shrink wrapped ones offer no protection at all, and to be honest, I would not be happy using them anyways. At least the hard casing offers a certain amount of protection to the cells.
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