Cat SX2 lipos

[F-1]

Hello! Can you help me please? I have found such line in description of SX2: Due to the low center of gravity nature of the transmission, the maximum LiPo height is 24mm, which excludes some of the 2010 spec 5400-5900mah 50C packs.
That is available in view of what it is possible to use the batteries with 24mm height? Earlier after all 24mm batteries too entered? Which differrences between Cat SX and SX2? New lowered bulkheads? New high mount top deck?
Thanks, sorry for my poor English, I'am only learn it.