Camera And Flash Battery Pack What Camera Equipment Am I Lacking For Wedding Photography?

What camera equipment am I lacking for wedding photography? - camera and flash battery pack

I have the following:
Nikon D300 (x2)
Sigma 70-200mm f2.8
Sigma 17-50mm f2.8
Nikon 18-200mm F3.5-5.6
Nikon 50mm f1.4
Nikon SB-900 flash with the SD-9 Battery
Sekonic L-358 Light Meter

In addition to memory cards, tripod / monopod, batteries, etc ...