Quantum makes the MKZ9 (DIN type plug) and SKZ9 cords that have Dummy Batteries SB-910 and SB-900 Speedlights. The External Power Port on Nikon Speedlights is wired directly to the capacitor and requires high voltage. I suspect that the same would be true for any third party Speedlight that uses the same plug. The CKE and CKE2 Cords for the Turbo Batteries will fit the External Power Port. Good Luck and Enjoy your Nikons!