What is the maximum height allowed in these style cars ?

I have no problems with dual pack setups even if I feel the design isn't optimal for the packs but I think trying to save weight with smaller packs just adds more battery issues in my opinion and this maybe healthy for battery guys like me it's not racer friendly.

I know as a racer you and others want to get the CG and weight as low as possible but to me when it starts creating issues with cycle life it makes no sense.