Because a flat RX pack is a flat RC pack, like a hump pack is a hump pack, they are standardized sizes, unless Mugen went out of their way to create a new pack size, it's all going to be much the same.


Given the pack in the 5 is mounted higher and to the left now, I'd say most will run a LiPo or LiFe, cause it just makes sense to reduce the weight of something now above the chassis line.