This a testbook examples of things not being "though through" and "MBA driven development."
Air cooling alone can be fine if battery chemistry is stable enough (lifepo.)
Using a novel battery chemistry in production with highly controlled settings is also fine enough.
Parachuting "big name management specialists" into an engineering project mid-way, and putting novel chemistry battery into an assembly specially designed with LiFePO cells in mind to send a PR signal of how "sophisticated you are," is not fine at all, and is a recipe for disaster.