To get max fps with D700/D300/D300s without using AA batteries:
Nikon-original only = MB-D10 + EN-EL4 / EN-EL4A + BL-3 (battery door) + Dedicated charger for EN-EL4 / EN-EL4A. All these need to be purchased separately & cost a bomb.
Phottix method = Phottix BG-D300 + Phottix Kosmo (Kosmo charger included with battery) = CHEAP...
And when I mean CHEAP I mean that for the price of an original Nikon MB-D10 I got my battery grip + 2 Phottix Kosmos brand new.