Positron said:Over-volting is not completely out of the question, but I wouldn't bet on it. If I had to take a wild guess, it would be to provide additional current to drive the built-in flash that fast? Does Nikon have any cameras with no built-in flash nor fixed grip (a la 5D)? Seems sort of silly, though. It's always possible it's just a marketing ploy.
Under higher FPS, the regulators will drain the battery much faster as they demand more current to make up for lost voltage to charge the capacitors. With 2 batteries there, the risk is lowered, in this configuration they are run in paralell, i.e. 2x current, not in series , i.e. 2x voltage. Then again as Neuro says, it is a carryover form film days and they want to sell you a grip and batteries.
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