Well we know the ROAR approval is just a formality. They no longer have any guts when it comes to slowing down all this battery development. Battery comes out...battery becomes legal! Period...
As for the battery adjustment. I remember when I owned the first Schumacher Mission. Things were tight with the 3000 cells back then. Some people suggested removing the extra layer of shrink wrap that some had added. Many argued that the small amount of diameter that the shrink wrap added couldn't
possibly account for the difference between a perfect fit and a too tight fit.
Well some of us tried removing the extra layer and 'bam' the packs dropped right in without any further work.
So, while the size difference looks small on paper, when you put 6 of those side by side as a pack and possibly with an extra layer of shrink wrap, it can add up in a hurry. Add to that, the fact that these cars are designed with such tight tolerances (a place for everything...everything in its place) and you have a reciepe for misfitting.
Not saying thats the case here with the IB3600 and GP3700 cells and the JRX-S. Just mentioning that it IS possible to have things thrown off by seemingly small measurements.