There are times when it can be advantageous. On an extremely high-bite track, if your car is very edgy, and always wants to traction roll in high-speed corners, moving the battery forward can reduce initial weight transfer on corner entry and not load up the outside front as much, greatly reducing the cars tendency to traction roll, without taking away too much steering by reducing the amount of mechanical grip the front suspension can generate. At least that's been my experience.