Wilson, 30cm for a battery?!? The LiFePO4 battery that powers my car has a footprint of 4cm by 14cm. Can't see how that would have any practical negative impact on footwell room in these cars with their very deep/long footwells. And I would argue the footwell, with some sort of minimal protective cover, is a much safer space for any heat sensitive component.
FWIW, my battery mounts in the stock location at the moment, and has survived 2 summers now driving in ambient temps high as 90F/32C.
