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MS12 experienced issues with braking. This is because the car only had front brakes and most of the weight was concentrated in the back. This combined with sensitive brakes led to the wheel locking up (skidding, no rotation, less efficient braking), which led to the car failing scrutineering trials.
MS15 will likely also be rear weighted again but will have brakes on all wheels. Brakes will also be designed to prevent wheel locking. Therefore, having more weight in the back should not be too much of an issue
Could move it to the front, but there would be concerns with how we vent the exhaust. Can not route it to the driver. Will have to allocate more space in the car to move the air. Limited space in the front to put the enclosure without having to create new structure.
General location in the back is fine as is, may use additional tubes on the side of the enclosure to help with mounting dynamics components, shouldn’t encroach on the space for the enclosure.
Conclusion:
As of right now it seems that placing the battery enclosure at the rear of the car would be the easiest and most feasible option.