My quantum came with a battery doa, and I had to mail order after not finding anything 8V and size wise compatible at my usual haunts.
Under $60, as I recall including shipping.
I have heard of problems with the springs in AA holder overheating and loosing their spring temper in the process when the flash is fired at a fast rate, empowered by the fast rechahrge from NiMH cells.
I stay clean of NimH due to their fast self discharge rate. With lead acid gel cells I can recharge them after using them, and then they can sit on the shelf for months before I want to grab them and put them into service for a shoot. They are always still close to full chahrge. You cannot say that after a NiMH has sat for more then a couple of days in my experience.